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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

Paper No: IPACK2022-97421

DOI: https://doi.org/10.1115/IPACK2022-97421

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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

Paper No: IPACK2022-97047

DOI: https://doi.org/10.1115/IPACK2022-97047

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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

Paper No: IPACK2022-97400

DOI: https://doi.org/10.1115/IPACK2022-97400

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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

Paper No: IMECE1997-0894

DOI: https://doi.org/10.1115/IMECE1997-0894

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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

Paper No: IMECE1998-0589

DOI: https://doi.org/10.1115/IMECE1998-0589

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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

Paper No: IPACK2021-73283

DOI: https://doi.org/10.1115/IPACK2021-73283

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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

J. Fluids Eng. August 2016, 138(8): 081104.

Paper No: FE-15-1362

DOI: https://doi.org/10.1115/1.4033025

Published Online: May 19, 2016

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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

Paper No: IMECE2015-50054

DOI: https://doi.org/10.1115/IMECE2015-50054

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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

Paper No: IPACK2015-48237

DOI: https://doi.org/10.1115/IPACK2015-48237

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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

Paper No: IPACK2015-48377

DOI: https://doi.org/10.1115/IPACK2015-48377

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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

Paper No: IPACK2015-48071

DOI: https://doi.org/10.1115/IPACK2015-48071

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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

Paper No: IPACK2015-48375

DOI: https://doi.org/10.1115/IPACK2015-48375

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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

Paper No: IPACK2015-48423

DOI: https://doi.org/10.1115/IPACK2015-48423

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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

J. Electron. Packag. December 2015, 137(4): 040801.

Paper No: EP-14-1117

DOI: https://doi.org/10.1115/1.4031326

Published Online: September 10, 2015

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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

Paper No: IMECE2014-36244

DOI: https://doi.org/10.1115/IMECE2014-36244

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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

Paper No: FEDSM2014-21264

DOI: https://doi.org/10.1115/FEDSM2014-21264

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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

Paper No: ICNMM2014-21699

DOI: https://doi.org/10.1115/ICNMM2014-21699

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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

Paper No: IPACK2013-73139

DOI: https://doi.org/10.1115/IPACK2013-73139

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Topics: Acoustics, Actuators, Air flow, Computer simulation, Convection, Cooling, Cycles, Flow (Dynamics), Fluids, Geometry

Proceedings Papers

Analysis of Single-Phase Multi-Layer Heat Sinks Using a Porous Media Approach: Influence of Spatially Varying Porosity

John J. Podhiny, Alfonso Ortega

Proc. ASME. InterPACK2013, Volume 2: Thermal Management; Data Centers and Energy Efficient Electronic Systems, V002T08A040, July 16–18, 2013

Paper No: IPACK2013-73189

DOI: https://doi.org/10.1115/IPACK2013-73189

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Topics: Heat sinks, Porosity, Porous materials, Design, Heat exchangers, Design methodology, Fluids, Modeling, Pressure drop, Scaling laws (Mathematical physics)

Proceedings Papers

Experiments and Simulation of an Impinging Synthetic Jet Designed to Eliminate Actuator Artifacts

Luis Silva, Alfonso Ortega, Mahsa Ebrahim

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, 703-710, July 8–12, 2012

Paper No: HT2012-58344

DOI: https://doi.org/10.1115/HT2012-58344

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Topics: Actuators, Simulation, Acoustics, Flow (Dynamics), Geometry, Jets, Air flow, Computer simulation, Cooling, Cycles

Journal citation

NARROW

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

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

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

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

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

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

Gas-Assisted Droplet Impact on a Solid Surface

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

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

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

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

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

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

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

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

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

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

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

Analysis of Single-Phase Multi-Layer Heat Sinks Using a Porous Media Approach: Influence of Spatially Varying Porosity

Experiments and Simulation of an Impinging Synthetic Jet Designed to Eliminate Actuator Artifacts

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