M.S., Mechanical Engineering, Oklahoma State University
B.S., Mechanical Engineering, Oklahoma State University
Honorary Professor of Xi'an Jiaotong University, Xi'an, China, 2009
Fellow of the American Society of Mechanical Engineers (ASME), 1996
Associate Fellow of the American Institute of Aeronautics and Astronautics (AIAA), 1993
Editor-in-Chief of Heat Transfer Engineering, published by Taylor and Francis, 1997-present
Registered Professional Engineer (Oklahoma), 1984
Outstanding Advisor Award, College of Engineering, Oklahoma State University, 2008
Golden Torch Faculty Award for Outstanding Scholarship, Leadership, and Service, Oklahoma State University/National Mortar Board Honor Society, 2003
Regents Distinguished Teaching Award, Oklahoma State University, 1996
Halliburton Excellent Teacher Award, Oklahoma State University, 1987, 1998
Mechanical Engineering Outstanding Faculty Award, Oklahoma State University, 1984, 1990
Heat Transfer in Mini/Micro Channels
Mixed Convection Heat Transfer
Computational Heat Transfer and Fluid Mechanics
Multiphase Heat Transfer in Flowlines and Wellbores
High Temperature Reactor Modeling for the Production of Titanium Dioxide
Synthesis Reactor Design for Cadmium and Zinc Selenides
Hydraulic and Thermal Performance Tests on a High Heat Flux Exchanger with PAO as a Coolant
Mixed Convective Heat Transfer and Pressure Drop in the Transition Region of a Horizontal Tube
Conjugate Heat Transfer in a Horizontal Channel with Discrete Heated Cubic Blocks
Thermal Aspects of Diamond Synthesis by Oxy-Acetylene Combustion Method
Thermal Management of Mini/Micro Channels - The quest for smaller, faster, and cheaper electronics has surpassed the current air cooled technologies ability to dissipate the heat generated. Forced convection, direct contact, single (liquid) and two-phase flow cooling will be investigated using mini/micro tubes and channels. Recent experimentation indicates there is a deviation from classical theory of heat transfer and pressure drop due to scaling effects from mini to the micro scale. The objectives of this study are to perform systematic pressure drop and heat transfer experiments for different flow rates, heat fluxes and inclination angles in mini and micro tubes and channels to gain a fundamental understanding of the important parameters influencing fluid flow and heat transfer in these systems.
Multiphase Heat Transfer in Flowlines and Wellbores - The knowledge of heat transport properties in two-phase, two-component (liquid and permanent gas) flow is of great importance in industrial applications, such as oil wells and pipelines. Drilling for oil and natural gas has moved farther offshore into deeper, colder waters and this has given rise to the wax deposition problems for the oil industry. This deposition occurs when crude oil is exposed to cold temperatures such as those commonly encountered in the arctic regions or cold oceans. Wax deposition problems have caused significant losses due to reduced production, well shut-in, failure of equipment, and additional horsepower requirements. The transportation of oil and natural gas through pipelines involves paths that are uphill, downhill, underwater, and over mountains. Successful design and operation of many oil production facilities requires the ability to predict/prevent wax deposition in the pipe lines. For this purpose it is essential to have an accurate knowledge of the heat transfer characteristics of the multiphase flow and the cloud point temperature (defined as the temperature at which a small amount of solid precipitates). Research on heat transfer estimation for nonboiling gas-liquid flow in pipes dates back at least 50 years. Nevertheless, no general predictive methods exist for engineering applications, particularly for gas-oil systems. Increasingly, subsea petroleum production systems are being engineered to transport full wellstreams. How these multiphase systems behave thermally is critical to the prevention of costly gas hydrate and wax deposition blockages. The ultimate goal of the present research is to develop a readily applied method suitable for the estimation of the inside heat transfer coefficients for two-phase petroleum flowlines and wellbores in all flow patterns and different inclination angels. This requires access to an extensive heat transfer, pressure drop, and void fraction database for flow in horizontal, inclined, and vertical pipes. Such information is not available in the open literature. Three video clips (Annular Flow-different inclination Angles, Slug Flow–Different Inclination Angles, and Different Flow Patterns–Horizontal Flow) based on this study appear in Chapter 1 (Video Gallery of Flow Phenomena) under Section 1.2 (Two-Phase Flow Patterns in Horizontal Tubes, see pages 1-5 to 1-6 and videos 1.2.14, 1.2.15, and 1.2.16) of the Wolverine Engineering Data Book III. The data book is free and can be accessed through the web site of Wolverine Tube Inc. To access the data book go to http://www.wlv.com/products/databook/db3/DataBookIII.pdf.
Heat Transfer/Pressure Drop in the Transition Region (Plain and Enhanced Tubes) - An important design problem in industrial heat exchangers arises when flow inside the tubes falls in the transition region, typically for Reynolds numbers as low as 200 to as high as 10,000 depending on the type of inlet configuration. Under these conditions the usually cited correlations for heat transfer and friction factor do not give reliable predictions. The aim of this study is to obtain accurate design correlations for heat transfer and pressure drop in plain tubes in the transition region for various entry configurations. Both experimental and analytical approaches were used. The results of this study have been summarized and appear in Chapter 5 (Enhanced Single-Phase Turbulent Tube-Side Flows and Heat Transfer) under Section 5.2 (Turbulent and Transition Flows and Heat Transfer in Plain Tubes, see pages 5-4 to 5-13) of the Wolverine Engineering Data Book III. The data book is free and can be accessed through the web site of Wolverine Tube Inc. To access the data book go to http://www.wlv.com/products/databook/db3/DataBookIII.pdf. [PDF of Summary of Transition Flow Research]
The study of single-phase heat transfer and pressure drop in the transition
region inside plain tubes with different inlet configurations has now
been extended to include enhanced tubes (helically ribbed tubes) with
different rib height, rib pitch, and rib helix angle. This is a joint project
with Dr. L. M. Tam of the University of Macau, China. The experimental facility
for this project is located at the University of Macau and experiments are
underway for both plain and enhanced tubes. The goal of this project is to
quantify the tube-side heat transfer and pressure drop characteristics of
enhanced tubes in the transition region for single-phase flow and to study the
effect of fin geometry and inlet flow configuration on transition Reynolds
number. This study is designed to increase fundamental understanding of
transition flows inside commercially available enhanced tubes. The ultimate goal
of the project is to develop fundamentally based correlations for predicting
single-phase heat transfer and pressure drop inside enhanced tubes for the
laminar and transition regions. The results of this study would be of great
interest to HVAC industry which uses enhanced tube bundles in flooded
evaporators and shell side condensers to increase heat transfer.
Photo Gallery (click each photo for larger view)
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Videos (tested with Windows Media Player versions 6 and 10
only)
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Our new experimental setup is equipped for measuring heat transfer, pressure drop, void fraction, and also conducting flow visualization in air-water flow at any pipe inclination (horizontal to vertical position).
Photo Gallery (click each photo for larger view)
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Mini/Micro Channel Heat Transfer Laboratory
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Heat Transfer
Engineering,
with Dr. Ghajar as its Editor-in-Chief since 1997, is an international
journal which publishes fourteen times per year by Taylor and Francis. The
journal is aimed at practicing engineers and specialists in the field of
heat transfer and is an unparalleled resource for key advances in the
field of heat transfer. In a clear, easy-to-read format, the journal
encompasses developments in equipment, instrumentation, and practice, and
serves as a prime forum for heat exchanger design, planning, and
operation. In addition to refereed papers of original work,
state-of-the-art reviews, the journal also includes current industry news,
summaries of product literature, accounts of the newest research results,
case studies of actual operating experiences with heat transfer equipment,
heat in history, book reviews, and announcements of meetings and
educational programs. Each volume of the journal contains approximately
1,200 pages.
COMPROP2 is an interactive computer program for the calculation of the properties of various compressible flows. The software was developed in collaboration with Dr. L. M. Tam (a former Ph.D. student and now with University of Macau). There are six modules in this computer program. The first five modules calculate the properties for: Isentropic Flow, Normal Shock Wave, Oblique Shock Wave, Fanno Flow, and Rayleigh Flow. The last module is for Supersonic Airfoil Analysis. For the first five modules, the user can input data and obtain output through a dialog box or from a graph, which is generated using the flow equations. For the supersonic airfoil analysis, a CAD environment is developed for the user to define the dimensions and shape of an airfoil. The software can then calculate the lift force, the drag force, and the pressure distribution of the airfoil according to the flow Mach number and the airfoil angle of attack. The first version of the software (COMPROP) was developed to support the textbook "Compressible Fluid Flow" by Oosthuizen and Carscallen, McGraw-Hill, 1997. The second version of the software (COMPROP2) is available with the new edition of "Modern Compressible Flow with Historical Perspective" by Anderson, McGraw-Hill, 2003.
COMPROP2 User Guide [PDF] is a 45-page document and was completed in December of 2003. The document is posted on the McGraw-Hill/Anderson site. This web-based resource for COMPROP2 links the program directly to selected topics, examples, and problems in the Anderson book.
Simple Aircraft Gas Turbine Design (SAGTD) is an interactive computer program and can be used for analysis and design of a turbojet engine. This software was developed in collaboration with Dr. R. D. Delahoussaye (a colleague in the OSU’s School of Mechanical and Aerospace Engineering) and Mr. V. V. Nayak (former MS student). The program has modules for the analysis/design of the six major components of a turbojet engine (Inlet, Diffuser, Compressor, Combustor, Turbine, and Nozzle). The analysis can be performed under both constant and variable specific heats assumption. The software has been used for several semesters in the Gas Power Systems (MAE 4243) course thought at Oklahoma State University. The MAE 4243 course is taken by both mechanical and aerospace engineering majors in their senior year. The software is available, free of charge, to the faculty at other universities that teach similar courses.
Steady State and Transient Heat Conduction (SS-T-CONDUCT)
is an interactive computer program and can be used for solving one and two
dimensional steady state and transient heat conduction problems. This software
was developed in collaboration with Mr. H. Al-Matar (former MS student). The
program can handle variety of boundary conditions (constant temperature,
specified heat flux, convection). For the transient solution, both implicit and
explicit schemes can be used. The software has been used for several semesters
in the Heat Transfer (MAE 3233) course thought at Oklahoma State University. The
software is available, free of charge, to the faculty at other universities that
teach similar courses.
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Cengel, Y. A. and Ghajar, A. J., Heat and Mass Transfer - A
Practical Approach, 4th Edition, McGraw-Hill, New York, NY (to be
published in 2010). |
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Ghajar, A. J. and Tang, C. C., “Recent Advances in Non-Boiling Two-Phase
Flow Heat Transfer and Void Fraction in Various Pipe Inclinations,” to be
published in Advances in Multiphase Flow and Heat Transfer, edited
by L. Cheng and D. Mewes, Bentham Sciences Publisher, UK (to be published in
2010). |
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Ghajar, A. J., “Transitional Flow in Tubes,” Chapter 8 in
Heat and Mass Transfer – A Practical Approach, 3rd Edition, Y. A. Cengel,
McGraw-Hill, New York, NY, pp. 482-490, 2007. |
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Ghajar, A. J. and Kim, J., “Calculation of Local Inside-Wall Convective
Heat Transfer Parameters from Measurements of the Local Outside-Wall
Temperatures along an Electrically Heated Circular Tube,” in Heat
Transfer Calculations, edited by Myer Kutz,
McGraw-Hill, New York, NY, pp. 23.3-23.27, 2006. |
| [PDF] |
Ghajar, A. J., “Compressible Flow,” Chapter 36 in
The Engineering Handbook, 2nd Edition, edited by R. C. Dorf, CRC
Press, Boca Roton, Florida, pp. 36-1 to 36-17, 2004. |
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Zurigat, Y. H. and Ghajar, A. J., "Heat Transfer and
Stratification in Sensible Heat Storage Systems,” Chapter 6 in Thermal
Energy Storage Systems and Applications, edited by I. Dincer, and M. A.
Rosen, John Wiley & Sons, UK, pp. 259-301, 2002. |
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Ghajar, A. J. and Tang, C. C., “Recent Developments in Non-Boiling
Two-phase Flow Heat Transfer and Void Fraction in Various Pipe Inclinations”,
Invited Talk to be presented at the 6th International Symposium on Multiphase
Flow, Heat and Mass Transfer, and Energy Conversion (ISMF2009), Xi’an,
China, July 11-15, 2009, the International Conference on Science,
Technology and Innovation for Sustainable Well-Being, Mahasarakham,
Thailand, July 23-24, 2009, and at the COBEM, International Congress of
Mechanical Engineering of ABCM, Gramado, Brazil, November 15-20, 2009. |
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Ghajar, A. J., “Recent Advances in Non-Boiling Two-Phase Flow Heat
Transfer in Horizontal, Inclined, and Vertical Pipes with Different Flow
Patterns,” Keynote Speaker for the International Iranian Society of
Mechanical Engineers Conference, held at the University of Tehran,
Tehran, Iran, May 20-22, 2009. |
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Ghajar, A. J., “Recent Advances in Non-Boiling Two-Phase
Flow Heat Transfer in Horizontal, Inclined, and Vertical Pipes with Different
Flow Patterns,” Invited Seminar delivered at the Swiss Federal Institute of
Technology, Lausanne, Switzerland, May 18, 2009. |
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Ghajar, A. J. and Tang, C. C., “Importance of Non-Boiling Two-Phase Flow
Heat Transfer in Pipes for Industrial Applications,” Keynote Paper,
Proceedings of the 11th Conference on Process Integration, Modeling and
Optimization for Energy Saving and Pollution Reduction (PRES’08),
Prague, Czech Republic, August 24-28, 2008. |
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Ghajar, A. J. and Tang, C. C., “Recent Advances in
Non-Boiling Two-Phase Flow Heat Transfer in Pipes,” Keynote Paper,
Proceedings of the 5th International Conference on Transport Phenomena in
Multiphase Systems (HEAT 2008), Bialystok, Poland, June 30 – July
3, 2008. |
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Ghajar, A. J., “Recent Advances in Non-Boiling Two-Phase
Flow Heat Transfer in Pipes,” Invited Seminar delivered at the University of
Oklahoma, Department of Mechanical and Aerospace Engineering, Norman,
Oklahoma, October 18, 2007. |
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Ghajar, A. J., “Non-Boiling Heat Transfer in Gas-Liquid
Flow in Pipes – A Tutorial,” Invited Tutorial, Proceedings of the 10th
Brazilian Congress of Thermal Engineering and Sciences (ENCIT 2004),
Rio de Janeiro, Brazil, November 29-December 03, 2004. |
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Ghajar, A. J., “Two-Phase Heat Transfer in Gas-Liquid
Non-Boiling Pipe Flows,” Keynote Paper, Proceedings of the 3rd
International Conference on Heat Transfer, Fluid Mechanics, and Thermodynamics (HEFAT
2004), Cape Town, South Africa, June 21-24, 2004. |
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Ghajar, A. J., “Two-Phase Heat Transfer,” Invited Seminar
delivered at the University of Pretoria, Pretoria, South Africa,
June 18, 2004. |
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Ghajar, A. J. and Tang, C. C., “Importance of Non-Boiling Two-Phase Flow
Heat Transfer in Pipes for Industrial Applications”, accepted for
publication in Heat Transfer Engineering (to be published in
August 2010). |
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Ghajar, A. J., Cook, W. L., and Tang, C. C., “Experimental Investigation
of Friction Factor in the Transition Region for Water Flow in Minitubes and
Microtubes”, accepted for publication in Heat Transfer Engineering
(to be published in July 2010). |
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[PDF]
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Tang,
C. C. and Ghajar, A. J., “A Mechanistic Approach for Heat Transfer
Estimation in Horizontal and Vertical Non-Boiling Two-Phase Pipe Flow,”
Chemical Engineering Transactions, Vol. 18, pp. 123-128, 2009. (DOI:
10.3303/CET0918018) |
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Tam,
L. M., Ghajar, A. J., Tam, H. K., “Contribution Analysis of
Dimensionless Variables for Laminar and Turbulent Flow Convection Heat
Transfer in a Horizontal Tube Using Artificial Neural Network,” Heat
Transfer Engineering, Vol. 29, No. 9, pp. 793-804, 2008. |
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Tam,
L. M., Ghajar, A. J., Tam, H. K., and Tam, S. C., “Development of a
Heat Transfer Correlation for the Transitional Flow in a Horizontal Tube
using Support Vector Machines,” Proceedings of the 2008 ASME Summer
Heat Transfer Conference, Jacksonville, Florida, August 10-14, 2008. |
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Tam,
L. M., Ghajar, A. J., Tam, H. K., and Tam, S. C., “Development of a
Flow Regime Map for a Horizontal Pipe with the Multi-Classification Support
Vector Machines,” Proceedings of the 2008 ASME Summer Heat Transfer
Conference, Jacksonville, Florida, August 10-14, 2008. |
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Ghajar, A. J.,
Rao, R. P., Cook, W. L., and Tang, C. C., “An Experimental Study of Friction
Factor in the Transition Region for Single Phase Flow in Mini-and
Micro-Tubes,” Proceedings of the 6th International
Conference on Nanochannels, Microchannels and Minichannels,
Darmstadt, Germany, June 23-25, 2008. |
| [PDF] |
Tang, C. C. and Ghajar, A. J., “Validation of a General Heat Transfer
Correlation for Non-Boling Two-Phase Flow with Different Flow Patterns and
Pipe Inclination Angles,” Proceedings of the 2007 ASME-JSME Thermal
Engineering Summer Heat Transfer Conference, Vancouver, British
Columbia, Canada, July 8-12, 2007. |
| [PDF] |
Tam, L. M.,
Tam, H. K., Ghajar, A. J., and Tam, S. C., “Factor Analysis for
Forced and Mixed Convection Laminar Heat Transfer in a Horizontal Tube Using
Artificial Neural Network,” Proceedings of the 2007 ASME-JSME Thermal
Engineering Summer Heat Transfer Conference, Vancouver, British
Columbia, Canada, July 8-12, 2007. |
| [PDF] |
Krishnamoorthy,
C., Rao, R. P., and Ghajar, A. J., “Single-Phase Heat Transfer in
Micro-Tubes: A Critical Review,” Proceedings of the 2007 ASME-JSME
Thermal Engineering Summer Heat Transfer Conference, Vancouver,
British Columbia, Canada, July 8-12, 2007. |
| [PDF] |
Krishnamoorthy,
C. and Ghajar, A. J., “Single-Phase Friction Factor in Micro-Tubes: A
Critical Review of Measurements, Instrumentation and Data Reduction
Techniques from 1991-2006,” Proceedings of the 5th
International Conference on Nanochannels, Microchannels and Minichannels,
June 18-20, Puebla, Mexico, 2007. |
| [PDF] |
Ghajar, A.
J.
and Tang, C. C., “Heat Transfer Measurements, Flow Pattern Maps and Flow
Visualization for Non-Boiling Two-Phase Flow in Horizontal and Slightly
Inclined Pipe,” Heat Transfer Engineering, Vol. 28, No. 6, pp.
525-540, 2007. |
| [PDF] |
Woldesemayat,
M. A. and Ghajar, A. J., “Comparison of Void Fraction Correlations
for Different Flow Patterns in Horizontal and Upward Inclined Pipes,”
International Journal of Multiphase Flow, Vol. 33, No. 4, pp.
347-370, 2007. |
| [PDF] |
Tam, H. K.,
Tam, S. C., Ghajar, A. J., and Tam, L. M., “Factor Analysis of
Convective Heat Transfer for a Horizontal Tube in the Turbulent Flow Region
Using Artificial Neural Network,” Proceedings of the International
Conference on Computational Methods in Engineering and Science (EPMESC X),
August 21-23, Sanya, Hainan, China, 2006. |
| [PDF] |
Ghajar, A. J. Kim, J., and Tang, C., “Two-phase Flow Heat Transfer
Measurements and Correlation for the Entire Flow Map in Horizontal Pipes,”
Proceedings of the Thirteenth International Heat Transfer Conference,
Sydney, Australia, August 13-18, 2006. |
| [PDF] |
Ghajar, A. J., Delahoussaye, R. D., and Al-Matar, H., “Development
and Implementation of Interactive/Visual Software for Steady State and
Transient Heat Conduction Problems,” Proceedings of the 2006 American
Society of Engineering Education Annular Conference and Exposition,
Chicago, Illinois, June 18-21, 2006. |
| [PDF] |
Kim, J. and Ghajar, A. J., “A General Heat Transfer Correlation for
Non-Boiling Gas-Liquid Flow with Different Flow Patterns in Horizontal
Pipes,” International Journal of Multiphase Flow, Vol. 32, No.
4, pp. 447-465, 2006. |
| [PDF] |
Tam, L. M. and Ghajar, A. J., “Transitional Heat Transfer in Plain Horizontal Tubes,” Heat Transfer Engineering, Vol. 27, No. 5, pp. 23-38, 2006. |
| [PDF] |
Kim, J.,
Ghajar, A. J., Tang, C., and Foutch, G. L., “Comparison of
Near-Wall Treatment Methods for High Reynolds Number Backward-Facing Step
Flow”, International Journal of Computational Fluid Dynamics,
Vol. 19, No. 7, pp. 493-500, 2005. |
| [PDF] |
Ghajar, A.
J.,
“Non-Boiling Heat Transfer in Gas-Liquid Flow in Pipes – A Tutorial,”
Journal of the Brazilian Society of Mechanical Sciences and Engineering,
Vol. XXVII, No. 1, pp. 46-73, 2005. |
| [PDF] |
Ghajar, A. J.
and
Kim, J., “A Non-Boiling Two-Phase Flow Heat Transfer Correlation for
Different Flow Patterns and Pipe Inclination Angles,” Proceedings of
the 2005 ASME Summer Heat Transfer Conference, San Francisco,
California, July 17-22, 2005. |
| [PDF] |
Ghajar, A. J.,
Delahoussaye, R. D., and Nayak, V. V., “Development and Implementation of
Interactive/Visual Software for Simple Aircraft Gas Turbine Design,”
Proceedings of the 2005 American Society of Engineering Education Annular
Conference and Exposition, Portland, Oregon, June 12-15, 2005. |
| [PDF] |
Ghajar, A. J., Tam, L. M., and Tam, S. K., “Improved Heat Transfer
Correlation in the Transition Region for a Circular Tube with Three Inlet
Configurations Using Artificial Neural Networks,” Heat Transfer
Engineering, Vol. 25, No. 2, pp. 30-40, 2004. |
| [PDF] |
Sofyan, Y., Ghajar, A. J., and Gasem,
K. A. M., “Multiphase Equilibrium Calculations Using Gibbs Minimization
Techniques,” Industrial & Engineering Chemistry Research,
Vol. 42, No. 16, pp. 3786-3801, 2003. |
| [PDF] |
Ghajar, A. J., Tam, L. M., and Tam, H.
K., 2003 “Heat Transfer Correlation for Two Phase Flow in Vertical Pipes Using
Artificial Neural Network,” Proceedings of
2003 ASME International Mechanical Engineering Congress and R&D Expo,
November 15-21, 2003,Washington, D.C. |
| [PDF] |
Ghajar, A. J., Tam, L. M., and Tam,
S.C., 2003 “A Simple Heat Transfer Correlation for Three Inlet Configurations
Using Artificial Neural Network in the Complex Transition Flow Regime,”
Proceedings of the 2003 ASME Summer Heat Transfer Conference, July
21-23, 2003, Las Vegas, Nevada. |
| [PDF] |
Sofyan, Y., Ghajar, A. J., and Gasem,
K. A. M., “A Systematic Method to Predict Cloud Point Temperature and Solid
Precipitation,” Petroleum Science and Technology, Vol. 21, Nos. 3
& 4, pp.409-424, 2003. |
| [PDF] |
Ghajar,
A. J., Tam, L. M., and Tam, S. K., “A New Heat Transfer Correlation in the
Transition Region for a Horizontal Pipe with a Reentrant Inlet – Using
Artificial Neural Network,” Heat Transfer 2002, Proceedings of the
Twelfth International Heat Transfer Conference, Elsevier,
pp. 189-194, 2002. |
| [PDF] |
Kim, D.
and Ghajar, A. J., "Heat
Transfer Measurements and Correlations for Air-Water Flow of Different Flow
Patterns in a Horizontal Pipe," Experimental
Thermal and Fluid Science, Vol. 25, No. 8, pp. 659-676,
2002. |
| [PDF] |
Tam, L. M., Ghajar,
A. J., and Pau, C. W., “Compressible Flow Software for Properties
Calculations and Airfoil Analysis,” Proceedings of the Eighth International Conference of Enhancement and Promotion of Computing Methods for
Engineering and Science (EPMESC’ VIII), editors L. Shaopei et al.,
July 25-28, Shanghai, China, 2001. |
| [PDF] |
Kim, D., Ghajar, A. J., and Dougherty, R. L., "Robust Heat-Transfer
Correlations for Turbulent Gas-Liquid Flow in Vertical Pipes," Journal
of Thermophysics and Heat Transfer, Vol. 14, No. 4, pp. 574-578,
2000. |
| [PDF] |
Whitelock, D. P., Brusewitz, G. H. and Ghajar, A. J., "Thermal/Physical
Properties Affect Predicted Weight Loss of Fresh Peaches," Transactions
of the ASAE, Vol. 42, No. 4, pp. 1047-1053, 1999. |
| [PDF] |
Kim, D., Ghajar, A. J., Dougherty, R. L., and Ryali, V. K.,"Comparison
of 20 Two-Phase Heat Transfer Correlations with Seven Sets of Experimental
Data, Including Flow Pattern and Tube Inclination Effects," Heat
Transfer Engineering, Vol. 20, No. 1, pp. 15-40, 1999. |
| [PDF] |
Tam, L. M. and Ghajar, A. J., "The Unusual Behavior of Local
Heat Transfer Coefficient in a Circular Tube with a Bell-Mouth Inlet,"
Experimental Thermal and Fluid Science, Vol. 16, No. 3, pp. 187-194, 1998.
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Tam, L. M. and Ghajar, A. J., "Effect of Inlet Geometry and Heating
on the Fully Developed Friction Factor in the Transition Region of a Horizontal
Tube," Experimental Thermal and Fluid Science, Vol. 15, No. 1, pp. 52-64, 1997.
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Tang, W. and Ghajar, A. J., "Experimental Study of
Conjugate Heat Transfer in a Horizontal Channel with Discrete Heated Cubic
Blocks," Thermal Management of Hand-Held, Wearable, and Portable Electronics,
eds. C. H. Amon et al., ASME, HTD-Vol. 343, pp. 91-102, 1997. |
| [PDF] |
Cutbirth, J. M. and Ghajar, A. J., "Thermal and
Hydraulic Analysis of a High Flux Heat Exchanger," Thermal Management of Commercial
and Military Electronics, eds. R. Schmidt et al. ASME, HTD-Vol. 329, pp. 187-196, 1996. |
| [PDF] |
Arabzadeh, M., Kim, D. and Ghajar, A. J.,
"Experimental Study of Geometric Effects on Forced Air-Cooling of Regular
In-Line Array of Electronic Components," Proceedings of the ASME/JSME Thermal
Engineering Joint Conference, eds. L.S. Fletcher and T. Aihara,
ASME, Vol. 4, pp. 231-239, 1995. |
| [PDF] |
Ghajar, A. J., Tang, W. C. and Beam, J. E., "Methodology for
Comparison of Hydraulic and Thermal Performance of Alternative Heat Transfer
Fluids in Complex Systems," Heat Transfer Engineering, Vol. 16,
No. 1, pp. 60-72, 1995. |
| [PDF] |
Ghajar, A. J. and Tam, L. M., "Flow Regime Map for a Horizontal
Pipe with Uniform Heat Flux and Three Different Inlet Configurations,"
Experimental Thermal and Fluid Science, Vol. 10, No. 3, pp.
287-297, 1995. |
| [PDF] |
Bang, K., Ghajar, A. J. and Komanduri, R., "The Effect of Substrate
Surface Temperature on the Morphology and Quality of Diamond Films Produced
by the Oxy-Acetylene Combustion Method," Thin Solid Films,
Vol. 238, pp. 172-183, February 1994. |
| [PDF] |
Ghajar, A. J. and Tam, L. M., "Heat Transfer Measurements and
Correlations in the Transition Region for a Circular Tube with Three Different
Inlet Configurations," Experimental Thermal and Fluid Science,
Vol. 8, No. 1, pp. 79-90, 1994. |
| [PDF] |
Ghajar, A. J. and Bang, K., "Parametric Effects on the Substrate
Temperature Profile in Oxy-Acetylene Flames,"
Heat Transfer Engineering,
Vol. 14, No. 3, pp. 48-59, 1993. |
| [PDF] |
Ghajar, A. J. and Bang, K., "Experimental and Analytical Studies
of Different Methods for Producing Stratified Flows,"
Energy – The
International Journal, Vol. 18, No. 4, pp. 323-334, 1993. |
| [PDF] |
Arabzadeh, M., Ogden, E. L. and Ghajar, A. J.,
"Conduction Heat Transfer Measurements for an Array of Surface Mounted Heated
Components," Enhanced Cooling Technologies for Electronics Applications,
eds. S. V. Garimella, et al., ASME, HTD-Vol. 263, pp. 69-78, 1993. |
| [PDF] |
Ghajar, A. J. and Madon, K. F., "Pressure Drop Measurements in
the Transition Region for a Circular Tube with Different Inlet Configurations,"
Experimental Thermal and Fluid Science, Vol. 5, No. 1, pp.
129-135, 1992. |
| [PDF] |
Abu-Hamdan, M. G., Zurigat, Y. H. and Ghajar, A. J., "An Experimental
Study of a Stratified Thermal Storage Under Variable Inlet Temperature
for Different Inlet Designs,"
International Journal of Heat and Mass
Transfer, Vol. 35, No. 8, pp. 1927-1934, 1992. |
| [PDF] |
Zurigat, Y. H., Liche, P. R. and Ghajar, A. J., "Influence of
Inlet Geometry on Mixing in Thermocline Thermal Energy Storage,"
International
Journal of Heat and Mass Transfer, Vol. 34, No. 1, pp. 115-125,
1991. |
| [PDF] |
Ghajar, A. J. and Zurigat, Y. H., "Microcomputer-Assisted Heat
Transfer Measurements/Analysis in a Circular Tube,"
International
Journal of Applied Engineering Education, Vol. 7, No. 2, pp. 125-134,
1991. |
| [PDF] |
Ghajar, A. J. and Zurigat, Y. H., "Numerical Study of the Effect
of Inlet Geometry on Stratification in Thermal Energy Storage," Numerical
Heat Transfer, Part A: Applications, Vol. 19, No. 1, pp. 65-83,
1991. |
| [PDF] |
Wang, Y. and Ghajar, A. J., "Effect of Component
Geometry and Layout on Flow Distribution for Surface Mounted Electronic
Components: A Smoke Flow Visualization Study," Heat Transfer Enhancement in
Electronics Cooling, eds. S. H. Bhavnani and M. Greiner, ASME,
HTD-Vol. 183, pp. 25-31, 1991. |
| [PDF] |
Zurigat, Y. H. and Ghajar, A. J., "Comparative Study of Weighted
Upwind and Second Order Upwind Difference Schemes,"
Numerical Heat
Transfer, Part B: Fundamentals, Vol. 18, No. 1, pp. 61-79, 1990. |
| [PDF] |
Zurigat, Y. H., Bang, K. and Ghajar, A. J., "Methods for Producing
Linear Density Gradients in Laboratory Tanks,"
Energy - The International
Journal, Vol. 15, No. 1, pp. 23-34, 1990. |
| [PDF] |
Ghajar, A.
J.
and Raza, K., "Mass Transfer Analogy for Heat Transfer Experiments in
Thermal Storage," International Communications in Heat and Mass
Transfer, Vol. 17, No. 1, pp. 79-91, 1990. |
| [PDF] |
Zurigat, Y. H., Maloney, K. J. and Ghajar, A. J., "A Comparison
Study of One-Dimensional Models for Stratified Thermal Storage Tanks,"
ASME Journal of Solar Energy Engineering, Vol. 111, No. 3,
pp. 204-210, 1989. |
| [PDF] |
Ghajar, A. J. and Yoon, H. K., "A Heat Transfer Correlation for
Viscoelastic Turbulent Pipe Flows," Chemical Engineering
Communications, Vol. 78, pp. 167-177, 1989. |
| [PDF] |
Toh, K. H. and Ghajar, A. J., "Heat Transfer in Thermal Entrance
Region for Viscoelastic Fluids in Turbulent Pipe Flows," International
Journal of Heat and Mass Transfer, Vol. 31, No. 6, pp. 1261-1267,
1988. |
| [PDF] |
Zurigat, Y. H., Ghajar, A. J. and Moretti, P. M., "Stratified
Thermal Storage Tank Inlet Mixing Characterization," Applied Energy,
Vol. 30, No. 2, pp. 99-111, 1988. |
| [PDF] |
Ghajar, A. J. and Azar, M. Y., "Empirical Correlations for Friction
Factor in Drag-Reducing Turbulent Pipe Flows," International
Communications in Heat and Mass Transfer, Vol. 15, No. 6, pp.
705-718, 1988. |
| [PDF] |
Yoon, H.
K. and Ghajar, A. J., "Heat Eddy Diffusivity for Viscoelastic
Turbulent Pipe Flows," International Communications in Heat and Mass
Transfer, Vol. 14, No. 3, pp. 237-249, 1987. |
| [PDF] |
Yoon, H.
K. and Ghajar, A. J., "A Note on the Powell-Eyring Fluid Model,"
International Communications in Heat and Mass Transfer, Vol. 14,
No. 4, pp. 381-390, 1987. |
| [PDF] |
Jakobsson, H. Th. and Ghajar, A. J., "Numerical Solutions of Heat
Conduction and Simple Fluid Flow Problems," International
Communications in Heat and Mass Transfer, Vol. 14, No. 1, pp. 67-79,
1987. |
| [PDF] |
Ghajar, A. J. and Asadi, A., "Improved Forced Convective Heat
Transfer Correlations for Liquids in the Near-Critical Region,"
AIAA
Journal, Vol. 24, No. 12, pp. 2030-2037, 1986. |
| [PDF] |
Zurigat, Y. H. and Ghajar, A. J., "Computer Simulation of Woodstove
Thermal Storage System," Energy Conversion and Management,
Vol. 26, No. 2, pp. 165-173, 1986. |
| [PDF] |
Oppel, F. J., Ghajar, A. J. and Moretti, P. M., "A Numerical
and Experimental Study of Stratified Thermal Storage,"
ASHRAE Transactions,
Vol. 92 (part 2), pp. 293-309, 1986. |
| [PDF] |
Oppel, F. J., Ghajar, A. J. and Moretti, P. M., "Computer Simulation
of Stratified Heat Storage," Applied Energy, Vol. 23, No.
3, pp. 205-224, 1986. |
| [PDF] |
Yoon, H.
K. and Ghajar, A. J., "A New Heat Eddy Diffusivity Equation for
Calculation of Heat Transfer to Drag Reducing Turbulent Pipe Flows,"
International Communications in Heat and Mass Transfer, Vol. 13, No.
4, pp. 449-464, 1986. |
| [PDF] |
Asgeirsson, L. S. and Ghajar, A. J., "Prediction of Thermal
Conductivity and Viscosity for Some Fluids in the Near-Critical Region,"
Chemical Engineering Communications, Vol. 43, Nos. 1-3, pp.
165-184, 1986. |
| [PDF] |
Kanchanalakshana, D. and Ghajar, A. J., "An Improved Falling Sphere
Viscometer for Intermediate Concentrations of Viscoelastic Fluids,"
International Communications in Heat and Mass Transfer, Vol. 13, No.
2, pp. 219-233, 1986. |
| [PDF] |
Maxwell, M. J. and Ghajar, A. J., "Laminar Forced Convective
Heat Transfer with Varying Properties in the Entrance Region of Flat Rectangular
Ducts," Heat Transfer Engineering, Vol. 6, No. 4, pp. 31-38,
1985. |
| [PDF] |
Ghorbani-Tari, S. and Ghajar, A. J., "Improved Free Convective
Heat Transfer Correlations in the Near-Critical Region," AIAA Journal,
Vol. 23, No. 10, pp. 1647-1649, 1985. |
| [PDF] |
Pilcher, K. R. and Ghajar, A. J., "Thermal Storage Mass Enhances
Woodstove Combustion and Reduces Pollution,"
Energy - The International
Journal, Vol. 10, No. 10, pp. 1151-1157, 1985. |
| [PDF] |
Yoon, H. K. and Ghajar, A. J., "An Analysis of the Heat Transfer
to Drag Reducing Turbulent Pipe Flows,"
ASME Journal of Heat Transfer,
Vol. 106, No. 4, pp. 898-900, 1984. |
| [PDF] |
Ghajar, A. J. and Parker, J. D., "Reference Temperatures for
Supercritical Laminar Free Convection on a Vertical Flat Plate,"
ASME
Journal of Heat Transfer, Vol. 103, No. 4, pp. 613-616, 1981. |
| [PDF] |
Ghajar, A. J. and Parker, J. D., "Laminar-Free Convection in the
Supercritical Region with Variable Properties," In the Proceedings of
the 1980 Heat Transfer and Fluid Mechanics Institute, eds. M.
Gerstein and P. R. Choudhury, Stanford University Press, pp. 196-208, 1980. |
| [PDF] |
Ghajar, A. J. and Tiederman, W. G., "Prediction of Heat Transfer
Coefficients in Drag Reducing Turbulent Pipe Flows," AIChE Journal,
Vol. 23, No. 1, pp. 128-131, 1977. |
