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John Richard Thome

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Related publications (260)

Two-phase flow of refrigerants in 85μm-wide multi-microchannels: Part II – Heat transfer with 35 local heaters

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

This article is the second part of a study on flow boiling of R236fa and R245fa. This part presents the heat transfer coefficients obtained in a 12.7 mm silicon evaporator composed of 135 microchannels with 85 mu m wide and 560 mu m high channels separated ...

Elsevier2011

Algebraic turbulence modeling in adiabatic and evaporating annular two-phase flow

John Richard Thome, Andrea Cioncolini

The study considers algebraic turbulence modeling in adiabatic and evaporating annular two-phase flow, focusing in particular on momentum and heat transfer (so-called 'convective boiling') through the annular liquid film. In contrast with single-phase wall ...

2011

Green Cooling of High Performance Micro Processors: Parametric Study between Flow Boiling and Water Cooling

John Richard Thome, Jonathan Olivier, Jackson Braz Marcinichen

Due to the increase in energy prices and spiralling consumption, there is a need to greatly reduce the cost of electricity within data centers, where it makes up 50% of the total cost of the IT infrastructure. A technological solution to this is using on-c ...

2011

Macro-to-microchannel transition in two-phase flow: Part 1 – Two-phase flow patterns and film thickness measurements

John Richard Thome, Chin Lee Ong

The classification of macroscale, mesoscale and microscale channels with respect to two-phase processes is still an open question. The main objective of this study focuses on investigating the macro-to-microscale transition during flow boiling in small sca ...

Elsevier2011

A level set method and a heat transfer model implemented into FLUENT for modeling of microscale two phase flows

John Richard Thome, Bogdan Alexandru Nichita

2010

The New 3rd Edition of the ALPEMA Plate-Fin Heat Exchanger Standards

John Richard Thome

Taylor & Francis2010

Film Condensation of R-134a and R-236fa, Part 2: Experimental Results and Predictive Correlation for Bundle Condensation on Enhanced Tubes

John Richard Thome, Mathieu Habert, Marcel Christians

Local test results for two enhanced condensing tubes (next-generation versions of the Wieland Gewa and Wolverine Turbo enhanced condensing tubes) are obtained for refrigerants R-134a and R-236fa on the center row of a three row-wide tube bundle. The "bundl ...

Taylor & Francis2010

Falling-Film Evaporation On Tube Bundle With Plain And Enhanced Tubes-Part Ii: New Prediction Methods

John Richard Thome, Mathieu Habert

Many parameters influence the falling-film evaporation process and, despite numerous studies, the basic mechanisms remain only partially clear, making the prediction of heat transfer still mainly an empirical process. The most important thermal design para ...

2010

Saturated critical heat flux in a multi-microchannel heat sink fed by a split flow system

John Richard Thome

An extensive experimental campaign has been carried out for the measurement of saturated critical heat flux in a multi-microchannel copper heat sink. The heat sink was formed by 29 parallel channels that were 199 mu m wide and 756 mu m deep. In order to in ...

Elsevier2010

Critical heat flux in multi-microchannel copper elements with low pressure refrigerants

John Richard Thome, Jung Eung Park

New saturated critical heat flux (CHF) data have been obtained experimentally in two different multi-microchannel heat sinks made in copper with three low pressure refrigerants (R134a, R236fa, R245fa). one of the test sections has 20 parallel rectangular c ...

Elsevier2010

Critical Heat Flux of R134a and R245fa in 2.2 mm Circular Tube

John Richard Thome, Sylwia Szczukiewicz, Cristiano Bigonha Tibiriça

2010

Conjugate Heat Transfer In Annular Laminar Film Condensation In Microchannels: Comparison of Numerical Model To Experimental Results

John Richard Thome, Stefano Nebuloni

2010

Film Condensation of R-134a and R-236fa, Part 1: Experimental Results and Predictive Correlation for Single-Row Condensation on Enhanced Tubes

John Richard Thome, Mathieu Habert, Marcel Christians

New predictive methods for falling film condensation on vertical arrays of horizontal tubes using different refrigerants are proposed, based on visual observations revealing that condensate is slung off the array of tubes sideways and significantly affects ...

Taylor & Francis2010

Void Fraction Prediction in Annular Two-Phase Flow Using an Algebraic Turbulence Model

John Richard Thome, Andrea Cioncolini

The study considers the prediction of the main flow parameters of adiabatic annular two-phase flows, focusing in particular on the void fraction. Recently developed models to predict the entrained liquid fraction, the wall shear stress and the velocity pro ...

2010

Cooling of microprocessors with micro-evaporation: A novel two-phase cooling cycle

John Richard Thome, Jackson Braz Marcinichen, Bruno Michel

Three micro-evaporator cooling cycles, one with a pump, one with a compressor and a hybrid of the two together, are proposed for cooling a computer blade server. The hybrid cycle is characterized by the interchangeability between the first two cycles, wher ...

Elsevier2010

Prediction of the entrained liquid fraction in vertical annular gas–liquid two-phase flow

John Richard Thome, Andrea Cioncolini

The study considers the prediction of the entrained liquid fraction in adiabatic gas-liquid annular two-phase flow in vertical pipes. Nine empirical correlations have been tested against an experimental data bank drawn together in this study containing 150 ...

Elsevier2010

Mechanisms of Boiling in Micro-Channels: Critical Assessment

John Richard Thome, Lorenzo Consolini

Numerous characteristic trends and effects have been observed in published studies on two-phase micro-channel boiling heat transfer. While macro-scale flow boiling heat transfer may be decomposed into nucleate and convective boiling contributions, at the m ...

Taylor & Francis2010

Numerical modeling of laminar annular film condensation for different channel shapes

John Richard Thome, Stefano Nebuloni

This paper presents a theoretical and numerical model to predict film condensation heat transfer in mini and micro-channels of different internal shapes. The model is based on a finite volume formulation of the Navier-Stokes and energy equations and it inc ...

Elsevier2010

Microscale Adiabatic Gas-Liquid Annular Two-Phase Flow: Analytical Model Description, Void Fraction, and Pressure Gradient Predictions

John Richard Thome, Lorenzo Consolini, Chin Lee Ong, Andrea Cioncolini

The study is devoted to the modeling of microscale adiabatic gas-liquid annular two-phase flow. The turbulent diffusion of momentum in the annular liquid film is assumed to be governed by the conditions near the channel wall, in analogy with single-phase t ...

Taylor & Francis2010

A novel time strip flow visualisation technique for investigation of intermittent dewetting and dryout in elongated bubble flow in a microchannel evaporator

John Richard Thome, Navid Borhani, Bruno Agostini

A flow visualisation study of flow boiling of R245fa in silicon multi-microchannels at low mass flux and moderate heat flux has been carried out with a high speed digital camera. The micro-evaporator had 67 channels of length 20 mm, width 223 mu m, and hei ...

2010

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