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John Richard Thome

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Related publications (260)

Modified Wilson Plots for Enhanced Heat Transfer Experiments: Current Status and Future Perspectives

John Richard Thome, Marcel Christians, Eugene van Rooyen

Heat transfer coefficients for enhanced tubes are typically measured indirectly using the "Wilson plot" method to first characterize the thermal performance of the one side (heating or cooling supply) and then to obtain the heat transfer data for the enhan ...

2012

CO2 and R410A: Two-phase flow visualizations and flow boiling measurements at medium (0.50) reduced pressure

John Richard Thome

The conversion to more environmentally friendly refrigerants is of prime importance for refrigeration and air-conditioning industries. A first option for the substitution of the fluids which use was banned could be natural refrigerants, such as CO2, or HFC ...

Pergamon-Elsevier Science Ltd2012

Entrained liquid fraction prediction in adiabatic and evaporating annular two-phase flow

John Richard Thome, Andrea Cioncolini

A new method to predict the entrained liquid fraction in annular two-phase flow is presented. The underlying experimental database contains 2460 data points collected from 38 different literature studies for 8 different gas-liquid or vapor-liquid combinati ...

2012

Void fraction prediction in annular two-phase flow

John Richard Thome, Andrea Cioncolini

A new method to predict the void fraction in annular two-phase flow in macroscale and microscale channels is presented. The underlying experimental database contains 2673 data points collected from 29 different literature studies for 8 different gas-liquid ...

2012

Boiling on a Tube Bundle: Part I-Flow Visualization and Onset of Dryout

John Richard Thome, Navid Borhani, Francesco Agostini, Eugene van Rooyen

A novel visualization method was developed and implemented in a refrigerant-flooded evaporator tube bundle. Specifically, a method to visualize the two-phase flow inside plain tube bundles was developed using a dummy tube with a tubular glass section for v ...

2012

Two-Phase Flow Boiling in a Single Layer of Future High-Performance 3D Stacked Computer Chips

John Richard Thome, Navid Borhani, Sylwia Szczukiewicz

The present study focuses on an experimental investigation of two-phase flow boiling in a silicon multi-microchannel evaporator, which emulates a single layer of a 3D stacked computer chip. The micro-evaporator is comprised of 67 parallel channels, each ha ...

Ieee2012

New prediction methods for CO2 evaporation inside tubes: Part I - A two-phase flow pattern map and a flow pattern based phenomenological model for two-phase flow frictional pressure drops (vol 51, pg 111, 2008)

John Richard Thome, Jesus Moreno Quiben

Elsevier2012

Falling film evaporation on enhanced tubes, part 1: Experimental results for pool boiling, onset-of-dryout and falling film evaporation

John Richard Thome, Marcel Christians

Horizontal falling film evaporators have the potential of displacing flooded evaporators as the standard in the refrigeration industry due to compelling advantages, such as smaller refrigerant charge and lower pressure drop. However, there is a need to imp ...

2012

Two-phase flow patterns in U-bends and their contiguous straight tubes for different orientations, tube and bend diameters

John Richard Thome, Ricardo Lima

In two-phase systems there are many singularities in piping systems, one of which in particular are U-bends (also called 180 degrees return bends or U-tubes) found very often in air conditioning coils, refrigerant systems, etc. Contrary to the literature c ...

Elsevier2012

Boiling on a Tube Bundle: Part II-Heat Transfer and Pressure Drop

John Richard Thome, Navid Borhani, Francesco Agostini, Eugene van Rooyen

An extensive experimental study was undertaken to measure nucleate pool boiling heat transfer coefficients, local bundle boiling heat transfer coefficients, and two-phase bundle pressure drops for R134a and R236fa on one plain tube bundle configuration. Th ...

2012

Flow pattern maps for convective boiling of CO2 and R410A in a horizontal smooth tube: Experiments and new correlations analyzing the effect of the reduced pressure

John Richard Thome

In this work flow visualizations and measurements are made and analyzed to identify flow regime transitions, slug-to-intermittent, intermittent-to-annular and the dry-out inception, during the flow boiling of CO2 in a horizontal smooth tube of 6.00 mm of i ...

2012

Experimental study on condensation heat transfer in vertical minichannels for new refrigerant R1234ze(E) versus R134a and R236fa

John Richard Thome, Jung Eung Park, Lorenzo Consolini, Farzad Vakili Farahani

Experimental condensation heat transfer data for the new refrigerant R1234ze(E), trans-1,3,3,3-tetrafluoropropene, are presented and compared with refrigerants R134a and R236fa for a vertically aligned, aluminum multi-port tube. Local condensation heat tra ...

Elsevier2011

Experimental Adiabatic Two-Phase Pressure Drops of R134a, R236fa and R245fa in Small Horizontal Circular Channels

John Richard Thome, Chin Lee Ong

2011

Macro-to-microchannel transition in two-phase flow: Part 2-Flow boiling heat transfer and critical heat flux

John Richard Thome, Chin Lee Ong

This part of the paper presents the current experimental flow boiling heat transfer and CHF data acquired for R134a, R236fa and R245fa in single, horizontal channels of 1.03, 2.20 and 3.04 mm diameters over a range of experimental conditions. The aim of th ...

Elsevier2011

TWO-PHASE FLOW AND BOILING OF AMMONIA IN HORIZONTAL SMOOTH TUBES

John Richard Thome, Ricardo Lima

The lecture will address our experimental work on observing flow patterns and measuring heat transfer coefficients and two-phase pressure drops for evaporating ammonia flows in a horizontal tube over a range of mass fluxes and saturation temperatures. Some ...

2011

A Review of On-Chip Micro-Evaporation: Experimental Evaluation of Liquid Pumping and Vapor Compression Driven Cooling Systems and Control

John Richard Thome, Jonathan Olivier, Jackson Braz Marcinichen

Thermal designers of data centers and server manufacturers are showing a greater concern regarding the cooling of the new generation data centers, which consume considerably more electricity and dissipate much more waste heat, a situation that is creating ...

2011

Efficiency Improvements of a Thermal Power Plant by Making Use of the Waste Heat of Large Datacenters using Two-Phase On-Chip Cooling

John Richard Thome, Jackson Braz Marcinichen, Nicolas Lamaison

Cooling of datacenters is estimated to have an annual electricity cost of 1.4 billion dollars in the United States and 3.6 billion dollars worldwide. Currently, refrigerated air is the most widely used means of cooling datacenter’s servers. Modern datacent ...

2011

Reasons to Use Two-phase Refrigerant Cooling

John Richard Thome, Jonathan Olivier, Jackson Braz Marcinichen

2011

Flow Boiling of R134a in a Multi-Microchannel Heat Sink with Hotspot Heaters for Energy-Efficient Microelectronic CPU Cooling Applications

John Richard Thome, Yassir Madhour, Etienne Costa-Patry, Jonathan Olivier, Bruno Michel

This paper focuses on two-phase flow boiling of refrigerant R134a inside a copper multi-microchannel heat sink for microelectronic central processing unit cooling applications. The heat sink is composed of 100 parallel microchannels, 100 mu m wide, 680 mu ...

2011

Characterization and prediction of two-phase flow regimes in miniature tubes

John Richard Thome, Rémi Revellin

Visual observations of two-phase regimes for R134a and R245fa flowing in 0.509 mm and 0.790 mm horizontal tubes are documented and compared to the predictions of the analytical flow regime models available in the literature. Annular flow was found to domin ...

Elsevier2011

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