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Journal Articles

Development of a Thermal Metrology Standard for Evaluation of Cold Plate Thermal Resistance as a Performance Metric

Victor A. Martinez, Carol Caceres, Alfonso Ortega
Journal: Journal of Electronic Packaging
Publisher: ASME
Article Type: Research-Article
J. Electron. Packag. December 2024, 146(4): 041118.
Paper No: EP-24-1040
https://doi.org/10.1115/1.4066101
Published Online: August 24, 2024
View Article titled, Development of a Thermal Metrology Standard for Evaluation of Cold Plate Thermal Resistance as a Performance Metric
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Topics: Temperature, Thermal resistance, Thermocouples, Coolants, Errors, Flow (Dynamics), Heat exchangers, Uncertainty
Proceedings Papers

Development of Thermal Metrology Standards for Experimental Characterization of Thermal Resistance for Single-Phase Liquid Cold Plates

Alfonso Ortega, Victor A. Martinez, Carol Caceres, Ali Heydari, Uschas Chowdhury
Proc. ASME. InterPACK2023, ASME 2023 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems, V001T02A019, October 24–26, 2023
Publisher: American Society of Mechanical Engineers
Paper No: IPACK2023-113883
https://doi.org/10.1115/IPACK2023-113883
View Paper titled, Development of Thermal Metrology Standards for Experimental Characterization of Thermal Resistance for Single-Phase Liquid Cold Plates
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Topics: Experimental characterization, Metrology, Plates (structures), Temperature, Thermal resistance, Engineering simulation, Errors, Simulation, Uncertainty, Boundary-value problems
Proceedings Papers

Determination of the Thermal Performance Limits for Single Phase Liquid Cooling Using an Improved Effectiveness-NTU Cold Plate Model

Alfonso Ortega, Carol Caceres, Umut Uras, Deogratius Kisitu, Uschas Chowdhury, Vahideh Radmard, Ali Heydari
Proc. ASME. InterPACK2022, ASME 2022 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems, V001T01A008, October 25–27, 2022
Publisher: American Society of Mechanical Engineers
Paper No: IPACK2022-97421
https://doi.org/10.1115/IPACK2022-97421
View Paper titled, Determination of the Thermal Performance Limits for Single Phase Liquid Cooling Using an Improved Effectiveness-NTU Cold Plate Model
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Topics: Cooling, Plates (structures), Thermal resistance, Flow (Dynamics), Pressure drop, Computational fluid dynamics, Coolants, Cooling systems, Engineering simulation, Fluids
Proceedings Papers

Direct-to-Chip Two-Phase Cooling for High Heat Flux Processors

Ali Heydari, Yaman Manaserh, Ahmad Abubakar, Carol Caceres, Harold Miyamura, Alfonso Ortega, Jeremy Rodriguez
Proc. ASME. InterPACK2022, ASME 2022 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems, V001T01A003, October 25–27, 2022
Publisher: American Society of Mechanical Engineers
Paper No: IPACK2022-97047
https://doi.org/10.1115/IPACK2022-97047
View Paper titled, Direct-to-Chip Two-Phase Cooling for High Heat Flux Processors
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Topics: Cooling, Heat flux
Proceedings Papers

Experimental Investigation of R134a Flow Boiling in Copper Foam Evaporators for High Heat Flux Electronics Cooling

Deogratius Kisitu, Carol Caceres, Metodi Zlatinov, Denver Schaffarzick, Alfonso Ortega
Proc. ASME. InterPACK2022, ASME 2022 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems, V001T08A003, October 25–27, 2022
Publisher: American Society of Mechanical Engineers
Paper No: IPACK2022-97400
https://doi.org/10.1115/IPACK2022-97400
View Paper titled, Experimental Investigation of R134a Flow Boiling in Copper Foam Evaporators for High Heat Flux Electronics Cooling
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Topics: Boiling, Computer cooling, Cooling, Copper, Flow (Dynamics), Heat flux, Metal foams
Proceedings Papers

Turbulent Heat Transfer in a Forced and Unforced Two Dimensional Air Jet Impinging on an Isoflux Surface

Edmund A. Singer, Alfonso Ortega
Proc. ASME. IMECE97, Heat Transfer: Volume 3, 55-62, November 16–21, 1997
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1997-0894
https://doi.org/10.1115/IMECE1997-0894
View Paper titled, Turbulent Heat Transfer in a Forced and Unforced Two Dimensional Air Jet Impinging on an Isoflux Surface
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Topics: Air jets, Turbulent heat transfer, Heat transfer, Flow (Dynamics), Nozzles, Fluctuations (Physics), Heat flux, Reynolds number, Spectra (Spectroscopy), Turbulence
Proceedings Papers

A Numerical Investigation of the Convective Heat Transfer in Unsteady Laminar Flow Past a Single and Tandem Pair of Square Cylinders in a Channel

Jorge L. Rosales, Alfonso Ortega, Joseph A. C. Humphrey
Proc. ASME. IMECE98, Heat Transfer: Volume 1 — Heat Transfer in Flowing Systems, 125-137, November 15–20, 1998
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1998-0589
https://doi.org/10.1115/IMECE1998-0589
View Paper titled, A Numerical Investigation of the Convective Heat Transfer in Unsteady Laminar Flow Past a Single and Tandem Pair of Square Cylinders in a Channel
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Topics: Convection, Cylinders, Laminar flow, Eddies (Fluid dynamics), Drag (Fluid dynamics), Flow (Dynamics), Heat transfer, Oscillations, Prandtl number, Reynolds number
Proceedings Papers

Thermal-Hydraulic Analytical Models of Split-Flow Microchannel Liquid-Cooled Cold Plates With Flow Impingement

Deogratius Kisitu, Alfonso Ortega
Proc. ASME. InterPACK2021, ASME 2021 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems, V001T02A015, October 26–28, 2021
Publisher: American Society of Mechanical Engineers
Paper No: IPACK2021-73283
https://doi.org/10.1115/IPACK2021-73283
View Paper titled, Thermal-Hydraulic Analytical Models of Split-Flow Microchannel Liquid-Cooled Cold Plates With Flow Impingement
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Topics: Cooling, Flow (Dynamics), Microchannels, Plates (structures)
Journal Articles

Gas-Assisted Droplet Impact on a Solid Surface

Andres J. Diaz, Alfonso Ortega
Journal: Journal of Fluids Engineering
Publisher: ASME
Article Type: Research-Article
J. Fluids Eng. August 2016, 138(8): 081104.
Paper No: FE-15-1362
https://doi.org/10.1115/1.4033025
Published Online: May 19, 2016
View Article titled, Gas-Assisted Droplet Impact on a Solid Surface
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Topics: Drops, Deformation, Kinetic energy
Proceedings Papers

An Experimental Study of the Forcing Effect on the Flow and Heat Transfer in a Turbulent Wall Jet

Johnny Issa, Alfonso Ortega
Proc. ASME. IMECE2015, Volume 8A: Heat Transfer and Thermal Engineering, V08AT10A038, November 13–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2015-50054
https://doi.org/10.1115/IMECE2015-50054
View Paper titled, An Experimental Study of the Forcing Effect on the Flow and Heat Transfer in a Turbulent Wall Jet
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Topics: Flow (Dynamics), Heat transfer, Turbulence, Jets, Skin friction (Fluid dynamics), Excitation, Fluctuations (Physics), Fluid mechanics, Shear (Mechanics)
Proceedings Papers

Steady State and Transient Comparison of Perimeter and Row-Based Cooling Employing Controlled Cooling Curves

Husam A. Alissa, Kourosh Nemati, Bahgat Sammakia, Alfonso Ortega, David King, Mark Seymour, Russell Tipton
Proc. ASME. InterPACK2015, Volume 1: Thermal Management, V001T09A017, July 6–9, 2015
Publisher: American Society of Mechanical Engineers
Paper No: IPACK2015-48237
https://doi.org/10.1115/IPACK2015-48237
View Paper titled, Steady State and Transient Comparison of Perimeter and Row-Based Cooling Employing Controlled Cooling Curves
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Topics: Cooling, Steady state, Transients (Dynamics), Data centers, Containment, Air flow, Coolers, Failure, Flow (Dynamics), Computational fluid dynamics
Proceedings Papers

Numerical and Experimental Characterization of the Transient Effectiveness of a Water to Air Heat Exchanger for Data Center Cooling Systems

Tianyi Gao, Marcelo del Valle, Alfonso Ortega, Bahgat G. Sammakia
Proc. ASME. InterPACK2015, Volume 1: Thermal Management, V001T09A043, July 6–9, 2015
Publisher: American Society of Mechanical Engineers
Paper No: IPACK2015-48377
https://doi.org/10.1115/IPACK2015-48377
View Paper titled, Numerical and Experimental Characterization of the Transient Effectiveness of a Water to Air Heat Exchanger for Data Center Cooling Systems
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Topics: Cooling systems, Data centers, Experimental characterization, Heat exchangers, Transients (Dynamics), Water, Computer simulation, Flow (Dynamics), Temperature, Coolers
Proceedings Papers

Raised Floor Hybrid Cooled Data Center: Effect on Rack Inlet Air Temperatures When In Row Cooling Units are Installed Between the Racks

Tianyi Gao, James Geer, Russell Tipton, Bruce Murray, Bahgat G. Sammakia, Alfonso Ortega, Roger Schmidt
Proc. ASME. InterPACK2015, Volume 1: Thermal Management, V001T09A012, July 6–9, 2015
Publisher: American Society of Mechanical Engineers
Paper No: IPACK2015-48071
https://doi.org/10.1115/IPACK2015-48071
View Paper titled, Raised Floor Hybrid Cooled Data Center: Effect on Rack Inlet Air Temperatures When In Row Cooling Units are Installed Between the Racks
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Topics: Cooling, Data centers, Temperature, Heat, Air flow, Computational fluid dynamics, Cooling systems, Stress, Computer simulation, Density
Proceedings Papers

Experimental Characterization of the Transient Response of Air/Water Crossflow Heat Exchangers for Data Center Cooling Systems

Marcelo del Valle, Alfonso Ortega
Proc. ASME. InterPACK2015, Volume 1: Thermal Management, V001T09A021, July 6–9, 2015
Publisher: American Society of Mechanical Engineers
Paper No: IPACK2015-48375
https://doi.org/10.1115/IPACK2015-48375
View Paper titled, Experimental Characterization of the Transient Response of Air/Water Crossflow Heat Exchangers for Data Center Cooling Systems
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Topics: Cooling systems, Data centers, Experimental characterization, Heat exchangers, Transients (Dynamics), Water, Flow (Dynamics), Temperature, Circuits, Cooling
Proceedings Papers

The Effectiveness of Data Center Overhead Cooling in Steady and Transient Scenarios: Comparison of Downward Flow to a Cold Aisle Versus Upward Flow From a Hot Aisle

Luis Silva-Llanca, Marcelo del Valle, Alfonso Ortega
Proc. ASME. InterPACK2015, Volume 1: Thermal Management, V001T09A023, July 6–9, 2015
Publisher: American Society of Mechanical Engineers
Paper No: IPACK2015-48423
https://doi.org/10.1115/IPACK2015-48423
View Paper titled, The Effectiveness of Data Center Overhead Cooling in Steady and Transient Scenarios: Comparison of Downward Flow to a Cold Aisle Versus Upward Flow From a Hot Aisle
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Topics: Cooling, Data centers, Flow (Dynamics), Transients (Dynamics), Heat exchangers, Cooling systems, Air flow, Energy efficiency, Pressure drop, Temperature
Journal Articles

A Brief Overview of Recent Developments in Thermal Management in Data Centers

Sami Alkharabsheh, John Fernandes, Betsegaw Gebrehiwot, Dereje Agonafer, Kanad Ghose, Alfonso Ortega, Yogendra Joshi, Bahgat Sammakia
Journal: Journal of Electronic Packaging
Publisher: ASME
Article Type: Research-Article
J. Electron. Packag. December 2015, 137(4): 040801.
Paper No: EP-14-1117
https://doi.org/10.1115/1.4031326
Published Online: September 10, 2015
View Article titled, A Brief Overview of Recent Developments in Thermal Management in Data Centers
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Topics: Computational fluid dynamics, Cooling, Data centers, Modeling, Temperature, Tiles, Thermal management
Proceedings Papers

Experimental Investigation of the Effect of Free Stream Flow on the Thermal Behavior of a Turbulent Wall Jet

Johnny Issa, Alfonso Ortega
Proc. ASME. IMECE2014, Volume 8A: Heat Transfer and Thermal Engineering, V08AT10A091, November 14–20, 2014
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2014-36244
https://doi.org/10.1115/IMECE2014-36244
View Paper titled, Experimental Investigation of the Effect of Free Stream Flow on the Thermal Behavior of a Turbulent Wall Jet
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Topics: Flow (Dynamics), Turbulence, Reynolds number, Heat transfer
Proceedings Papers

A Numercial Investigation of the Skin Friction Coefficient and Nusselt Number in a Laminar Wall Jet That Evolves From a Parabolic Velocity Profile to its Self-Similar Behavior

Johnny Issa, Alfonso Ortega
Proc. ASME. FEDSM2014, Volume 1A, Symposia: Advances in Fluids Engineering Education; Turbomachinery Flow Predictions and Optimization; Applications in CFD; Bio-Inspired Fluid Mechanics; Droplet-Surface Interactions; CFD Verification and Validation; Development and Applications of Immersed Boundary Methods; DNS, LES, and Hybrid RANS/LES Methods, V01AT03A007, August 3–7, 2014
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2014-21264
https://doi.org/10.1115/FEDSM2014-21264
View Paper titled, A Numercial Investigation of the Skin Friction Coefficient and Nusselt Number in a Laminar Wall Jet That Evolves From a Parabolic Velocity Profile to its Self-Similar Behavior
Open the PDF for A Numercial Investigation of the Skin Friction Coefficient and Nusselt Number in a Laminar Wall Jet That Evolves From a Parabolic Velocity Profile to its Self-Similar Behavior in another window
Topics: Skin friction (Fluid dynamics), Reynolds number, Flow (Dynamics), Boundary-value problems, Prandtl number, Fluids, Heat flux, Temperature, Water
Proceedings Papers

Parametric Studies of Single-Phase Multi-Layer Heat Sinks Using a Porous Media Approach: Effects of Spatially-Varying Porosity and Total Porosity

John J. Podhiny, Alfonso Ortega
Proc. ASME. ICNMM2014, ASME 2014 12th International Conference on Nanochannels, Microchannels and Minichannels, V001T02A005, August 3–7, 2014
Publisher: American Society of Mechanical Engineers
Paper No: ICNMM2014-21699
https://doi.org/10.1115/ICNMM2014-21699
View Paper titled, Parametric Studies of Single-Phase Multi-Layer Heat Sinks Using a Porous Media Approach: Effects of Spatially-Varying Porosity and Total Porosity
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Topics: Heat sinks, Porosity, Porous materials, Design, Fluids, Copper, Equilibrium (Physics), Flow (Dynamics), Heat, Heat exchangers
Proceedings Papers

Experimental Study of the Convective Heat Transfer From a Geometrically Scaled Up 2D Impinging Synthetic Jet

Luis Silva, Alfonso Ortega, Isaac Rose
Proc. ASME. InterPACK2013, Volume 2: Thermal Management; Data Centers and Energy Efficient Electronic Systems, V002T08A030, July 16–18, 2013
Publisher: American Society of Mechanical Engineers
Paper No: IPACK2013-73139
https://doi.org/10.1115/IPACK2013-73139
View Paper titled, Experimental Study of the Convective Heat Transfer From a Geometrically Scaled Up 2D Impinging Synthetic Jet
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Topics: Acoustics, Actuators, Air flow, Computer simulation, Convection, Cooling, Cycles, Flow (Dynamics), Fluids, Geometry