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Afshin J. Ghajar
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Journal Articles

Bubble Size Distribution Dependence on Liquid Viscosity and Gas Flowrate Within a Bubble Column With a Porous Sparger

Shahrouz Mohagheghian, Afshin J. Ghajar, Brian R. Elbing
Journal: Journal of Fluids Engineering
Publisher: ASME
Article Type: Research-Article
J. Fluids Eng. February 2023, 145(2): 021403.
Paper No: FE-22-1141
https://doi.org/10.1115/1.4056035
Published Online: November 1, 2022
View Article titled, Bubble Size Distribution Dependence on Liquid Viscosity and Gas Flowrate Within a Bubble Column With a Porous Sparger
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Topics: Bubbles, Viscosity
Proceedings Papers

Heat Transfer of Slug Air-Water Flow in a Slightly Upward Inclined Tube

Jae-yong Kim, Steve Trimble, Afshin J. Ghajar
Proc. ASME. IMECE2001, Heat Transfer: Volume 2 — Heat Transfer in Multiphase Systems, 117-125, November 11–16, 2001
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2001/HTD-24162
https://doi.org/10.1115/IMECE2001/HTD-24162
View Paper titled, Heat Transfer of Slug Air-Water Flow in a Slightly Upward Inclined Tube
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Topics: Flow (Dynamics), Heat transfer, Slug flows, Water, Reynolds number, Heat transfer coefficients, Boundary-value problems, Heat flux, Pipes, Two-phase flow
Proceedings Papers

Heat Transfer Correlations for Air-Water Two-Phase Flow of Different Flow Patterns in a Horizontal Pipe

Dongwoo Kim, Jae-yong Kim, Afshin J. Ghajar, Ronald L. Dougherty
Proc. ASME. IMECE2000, Heat Transfer: Volume 4, 295-308, November 5–10, 2000
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2000-1534
https://doi.org/10.1115/IMECE2000-1534
View Paper titled, Heat Transfer Correlations for Air-Water Two-Phase Flow of Different Flow Patterns in a Horizontal Pipe
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Topics: Flow (Dynamics), Heat transfer, Pipes, Two-phase flow, Water, Boundary-value problems, Heat flux, Photography, Reynolds number, Transparency
Proceedings Papers

Effect of Void Fraction on Pressure Drop in Upward Vertical Two-Phase Gas-Liquid Pipe Flow

Clement C. Tang, Sanjib Tiwari, Afshin J. Ghajar
Proc. ASME. ICONE20-POWER2012, Volume 3: Thermal-Hydraulics; Turbines, Generators, and Auxiliaries, 751-759, July 30–August 3, 2012
Publisher: American Society of Mechanical Engineers
Paper No: ICONE20-POWER2012-55167
https://doi.org/10.1115/ICONE20-POWER2012-55167
View Paper titled, Effect of Void Fraction on Pressure Drop in Upward Vertical Two-Phase Gas-Liquid Pipe Flow
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Topics: Pipe flow, Porosity, Pressure drop
Proceedings Papers

Flow Pattern and Pipe Orientation Independent Semi-Empirical Void Fraction Correlation for a Gas-Liquid Two Phase Flow Based on the Concept of Drift Flux Model

Swanand M. Bhagwat, Afshin J. Ghajar
Proc. ASME. HT2012, Volume 2: Heat Transfer Enhancement for Practical Applications; Fire and Combustion; Multi-Phase Systems; Heat Transfer in Electronic Equipment; Low Temperature Heat Transfer; Computational Heat Transfer, 327-336, July 8–12, 2012
Publisher: American Society of Mechanical Engineers
Paper No: HT2012-58048
https://doi.org/10.1115/HT2012-58048
View Paper titled, Flow Pattern and Pipe Orientation Independent Semi-Empirical Void Fraction Correlation for a Gas-Liquid Two Phase Flow Based on the Concept of Drift Flux Model
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Topics: Flow (Dynamics), Pipes, Porosity, Two-phase flow, Fluids
Proceedings Papers

Experimental Investigation and Performance Evaluation of Isothermal Frictional Two Phase Pressure Drop Correlations in Vertical Downward Gas-Liquid Two Phase Flow

Swanand M. Bhagwat, Mehmet Mollamahmutoglu, Afshin J. Ghajar
Proc. ASME. HT2012, Volume 2: Heat Transfer Enhancement for Practical Applications; Fire and Combustion; Multi-Phase Systems; Heat Transfer in Electronic Equipment; Low Temperature Heat Transfer; Computational Heat Transfer, 337-348, July 8–12, 2012
Publisher: American Society of Mechanical Engineers
Paper No: HT2012-58049
https://doi.org/10.1115/HT2012-58049
View Paper titled, Experimental Investigation and Performance Evaluation of Isothermal Frictional Two Phase Pressure Drop Correlations in Vertical Downward Gas-Liquid Two Phase Flow
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Topics: Performance evaluation, Pressure drop, Two-phase flow, Flow (Dynamics), Fluids, Pipes, Porosity, Chemical energy, Friction, Hydrostatics
Proceedings Papers

Experimental Investigation of Single-Phase Heat Transfer in a Horizontal Internally Micro-Fin Tube With Three Different Inlet Configurations

Hou Kuan Tam, Lap Mou Tam, Afshin J. Ghajar, Cheong Sun, Weng Kuong Lai
Proc. ASME. HT2012, Volume 1: Heat Transfer in Energy Systems; Theory and Fundamental Research; Aerospace Heat Transfer; Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat and Mass Transfer in Biotechnology; Environmental Heat Transfer; Visualization of Heat Transfer; Education and Future Directions in Heat Transfer, 533-539, July 8–12, 2012
Publisher: American Society of Mechanical Engineers
Paper No: HT2012-58125
https://doi.org/10.1115/HT2012-58125
View Paper titled, Experimental Investigation of Single-Phase Heat Transfer in a Horizontal Internally Micro-Fin Tube With Three Different Inlet Configurations
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Topics: Heat transfer, Turbulence, Boundary-value problems, Buoyancy, Heat flux, Heat transfer coefficients, HVAC equipment, Reynolds number
Proceedings Papers

Experimental Investigation and Empirical Analysis of Non-Boiling Gas-Liquid Two Phase Heat Transfer in Vertical Downward Pipe Orientation

Swanand M. Bhagwat, Mehmet Mollamahmutoglu, Afshin J. Ghajar
Proc. ASME. HT2012, Volume 2: Heat Transfer Enhancement for Practical Applications; Fire and Combustion; Multi-Phase Systems; Heat Transfer in Electronic Equipment; Low Temperature Heat Transfer; Computational Heat Transfer, 349-359, July 8–12, 2012
Publisher: American Society of Mechanical Engineers
Paper No: HT2012-58072
https://doi.org/10.1115/HT2012-58072
View Paper titled, Experimental Investigation and Empirical Analysis of Non-Boiling Gas-Liquid Two Phase Heat Transfer in Vertical Downward Pipe Orientation
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Topics: Boiling, Heat transfer, Pipes, Flow (Dynamics), Heat transfer coefficients, Water, Chemical processes, Convection, Ethanol, Fluids
Journal Articles

Effect of Void Fraction on Pressure Drop in Upward Vertical Two-Phase Gas-Liquid Pipe Flow

Clement C. Tang, Sanjib Tiwari, Afshin J. Ghajar
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. February 2013, 135(2): 022901.
Paper No: GTP-12-1356
https://doi.org/10.1115/1.4007762
Published Online: January 8, 2013
View Article titled, Effect of Void Fraction on Pressure Drop in Upward Vertical Two-Phase Gas-Liquid Pipe Flow
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Topics: Flow (Dynamics), Porosity, Pressure drop, Two-phase flow, Water, Pressure gradient
Proceedings Papers

Experimental Investigaton of the Single-Phase Friction Factor and Heat Transfer Inside the Horizontal Internally Micro-Fin Tubes in the Transition Region

Hou Kuan Tam, Lap Mou Tam, Afshin J. Ghajar, Cheong Sun, Hau Yin Leung
Proc. ASME. AJK2011, ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D, 2963-2970, July 24–29, 2011
Publisher: American Society of Mechanical Engineers
Paper No: AJK2011-16026
https://doi.org/10.1115/AJK2011-16026
View Paper titled, Experimental Investigaton of the Single-Phase Friction Factor and Heat Transfer Inside the Horizontal Internally Micro-Fin Tubes in the Transition Region
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Topics: Friction, Heat transfer
Proceedings Papers

The Effect of Inner Surface Roughness and Heating on Friction Factor in Horizontal Micro-Tubes

Lap Mou Tam, Hou Kuan Tam, Afshin J. Ghajar, Wa San Ng, Ieok Wa Wong, Ka Fu Leong, Choi Keng Wu
Proc. ASME. AJK2011, ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D, 2971-2978, July 24–29, 2011
Publisher: American Society of Mechanical Engineers
Paper No: AJK2011-16027
https://doi.org/10.1115/AJK2011-16027
View Paper titled, The Effect of Inner Surface Roughness and Heating on Friction Factor in Horizontal Micro-Tubes
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Topics: Friction, Heating, Surface roughness
Proceedings Papers

A Mechanistic Heat Transfer Correlation for Non-Boiling Two-Phase Flow in Horizontal, Inclined and Vertical Pipes

Clement C. Tang, Afshin J. Ghajar
Proc. ASME. AJTEC2011, ASME/JSME 2011 8th Thermal Engineering Joint Conference, T10184, March 13–17, 2011
Publisher: American Society of Mechanical Engineers
Paper No: AJTEC2011-44114
https://doi.org/10.1115/AJTEC2011-44114
View Paper titled, A Mechanistic Heat Transfer Correlation for Non-Boiling Two-Phase Flow in Horizontal, Inclined and Vertical Pipes
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Topics: Boiling, Heat transfer, Pipes, Two-phase flow, Flow (Dynamics), Friction, Heat transfer coefficients, Pressure drop, Pipe flow, Reynolds number
Proceedings Papers

Experimental Analysis of the Single-Phase Heat Transfer and Friction Factor Inside the Horizontal Internally Micro-Fin Tube

Hou Kuan Tam, Lap Mou Tam, Afshin J. Ghajar
Proc. ASME. AJTEC2011, ASME/JSME 2011 8th Thermal Engineering Joint Conference, T10106, March 13–17, 2011
Publisher: American Society of Mechanical Engineers
Paper No: AJTEC2011-44555
https://doi.org/10.1115/AJTEC2011-44555
View Paper titled, Experimental Analysis of the Single-Phase Heat Transfer and Friction Factor Inside the Horizontal Internally Micro-Fin Tube
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Topics: Experimental analysis, Friction, Heat transfer, Turbulence, Pressure drop, Reynolds number, Buoyancy, Delays, Flow (Dynamics), HVAC equipment
Proceedings Papers

Simultaneous Heat Transfer and Pressure Drop Measurements for a Horizontal Micro-Tube

Lap Mou Tam, Hou Kuan Tam, Afshin J. Ghajar
Proc. ASME. AJTEC2011, ASME/JSME 2011 8th Thermal Engineering Joint Conference, T10122, March 13–17, 2011
Publisher: American Society of Mechanical Engineers
Paper No: AJTEC2011-44218
https://doi.org/10.1115/AJTEC2011-44218
View Paper titled, Simultaneous Heat Transfer and Pressure Drop Measurements for a Horizontal Micro-Tube
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Topics: Heat transfer, Pressure drop, Heating, Surface roughness, Boundary-value problems, Friction, Heat flux, Reynolds number, Turbulence, Buoyancy
Proceedings Papers

Validation of a General Heat Transfer Correlation for Non-Boiling Two-Phase Flow With Different Flow Patterns and Pipe Inclination Angles

Clement C. Tang, Afshin J. Ghajar
Proc. ASME. HT2007, ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference, Volume 2, 205-218, July 8–12, 2007
Publisher: American Society of Mechanical Engineers
Paper No: HT2007-32219
https://doi.org/10.1115/HT2007-32219
View Paper titled, Validation of a General Heat Transfer Correlation for Non-Boiling Two-Phase Flow With Different Flow Patterns and Pipe Inclination Angles
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Topics: Boiling, Flow (Dynamics), Heat transfer, Pipes, Two-phase flow, Porosity, Reynolds number, Water, Boundary-value problems, Heat flux
Proceedings Papers

Single-Phase Heat Transfer in Micro-Tubes: A Critical Review

Chandramoulee Krishnamoorthy, Rahul P. Rao, Afshin J. Ghajar
Proc. ASME. HT2007, ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference, Volume 2, 979-989, July 8–12, 2007
Publisher: American Society of Mechanical Engineers
Paper No: HT2007-32408
https://doi.org/10.1115/HT2007-32408
View Paper titled, Single-Phase Heat Transfer in Micro-Tubes: A Critical Review
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Topics: Heat transfer, Surface roughness, Flow (Dynamics), Gas flow, Buoyancy, Instrumentation
Proceedings Papers

An Experimental Study of Friction Factor in the Transition Region for Single Phase Flow in Mini- and Micro-Tubes

Afshin J. Ghajar, Rahul P. Rao, Wendell L. Cook, Clement C. Tang
Proc. ASME. ICNMM2008, ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels, 249-257, June 23–25, 2008
Publisher: American Society of Mechanical Engineers
Paper No: ICNMM2008-62281
https://doi.org/10.1115/ICNMM2008-62281
View Paper titled, An Experimental Study of Friction Factor in the Transition Region for Single Phase Flow in Mini- and Micro-Tubes
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Topics: Flow (Dynamics), Friction, Diaphragms (Mechanical devices), Diaphragms (Structural), Pressure, Pressure drop, Pressure transducers, Stainless steel
Proceedings Papers

Single-Phase Friction Factor in Micro-Tubes: A Critical Review of Measurement, Instrumentation and Data Reduction Techniques From 1991-2006

Chandramoulee Krishnamoorthy, Afshin J. Ghajar
Proc. ASME. ICNMM2007, ASME 5th International Conference on Nanochannels, Microchannels, and Minichannels, 813-825, June 18–20, 2007
Publisher: American Society of Mechanical Engineers
Paper No: ICNMM2007-30022
https://doi.org/10.1115/ICNMM2007-30022
View Paper titled, Single-Phase Friction Factor in Micro-Tubes: A Critical Review of Measurement, Instrumentation and Data Reduction Techniques From 1991-2006
Open the PDF for Single-Phase Friction Factor in Micro-Tubes: A Critical Review of Measurement, Instrumentation and Data Reduction Techniques From 1991-2006 in another window
Topics: Friction, Instrumentation, Fluid dynamics, Surface roughness, Dynamics (Mechanics), Pressure drop, Reynolds number, Uncertainty
Proceedings Papers

Heat Transfer Measurements and Correlations for Air-Water Two-Phase Slug Flow in a Horizontal Pipe

Afshin J. Ghajar, Kapil Malhotra, Jae-Yong Kim, Steve A. Trimble
Proc. ASME. HT-FED2004, Volume 3, 745-753, July 11–15, 2004
Publisher: American Society of Mechanical Engineers
Paper No: HT-FED2004-56614
https://doi.org/10.1115/HT-FED2004-56614
View Paper titled, Heat Transfer Measurements and Correlations for Air-Water Two-Phase Slug Flow in a Horizontal Pipe
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Topics: Heat transfer, Pipes, Slug flows, Water, Reynolds number, Heat transfer coefficients, Flow (Dynamics), Boundary-value problems, Heat flux, Stainless steel