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John Richard Thome

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Publications associées (260)

Falling-Film Evaporation On Tube Bundle With Plain And Enhanced Tubes-Part I: Experimental Results

John Richard Thome, Mathieu Habert

The complexities of two-phase flow and falling-film evaporation on a tube bundle present important challenges in the design of heat exchangers and the understanding of the physical phenomena taking place. The development of structured surfaces to enhance n ...

2010

A Level Set Method Coupled With a Volume of Fluid Method for Modeling of Gas-Liquid Interface in Bubbly Flow

John Richard Thome, Bogdan Alexandru Nichita, Iztok Zun

This paper describes the implementation of a 3D parallel and Cartesian level set (LS) method coupled with a volume of fluid (VOF) method into the commercial CFD code FLUENT for modeling the gas-liquid interface in bubbly flow. Both level set and volume of ...

American Society of Mechanical Engineers2010

Two-Phase Pressure Drops in Adiabatic Horizontal Circular Smooth U-Bends and Contiguous Straight Pipes (RP-1444)

John Richard Thome, Ricardo Lima

Curved channels in the form of bends are encountered in many industrial two-phase flow applications, such as U-bends in air-conditioning and refrigeration evaporators and condensers. For engineering design purposes, the evaluation of the pressure loss in t ...

2010

Recent Developments in Flow Boiling and Two-Phase Flow in Small Channels and Microchannels

John Richard Thome, Andrea Cioncolini

Microscale two-phase flow is at present one of the hottest topics of heat transfer research, both in academia and in the industry. The miniaturization of two-phase flow systems, which has led to numerous experimental and theoretical challenges not yet comp ...

Taylor & Francis2010

A heat transfer model for evaporation of coalescing bubbles in micro-channel flow

John Richard Thome, Lorenzo Consolini

The current study presents a one-dimensional model of confined coalescing bubble flow for the prediction of micro-channel convective boiling heat transfer. Coalescing bubble flow has recently been identified as one of the characteristic flow patterns to be ...

Elsevier2010

Constructal tree-shaped microchannel networks for maximizing the saturated critical heat flux

John Richard Thome, Rémi Revellin

A constructaltree-shaped microchannel network for maximizing the saturated critical heat flux in a disc-shaped planar body has been investigated. n(0) radial channels touch the center and n(p) channels touch the periphery. Designs with no pairing level (n( ...

Elsevier2009

Transition of Bubbly Flow in Vertical Tubes: Effect of Bubble Size and Tube Diameter

John Richard Thome

In a companion paper ("Modelling Bubbly Flow by population Balance Technique Part I: Axial Flow Development and Its Transitions, " ASME J. Fluids Eng), a two fluid model along with a multiclass population balance technique has been used to find out compreh ...

American Society of Mechanical Engineers2009

Micro-channel flow boiling heat transfer of R-134a, R-236fa, and R-245fa

John Richard Thome, Lorenzo Consolini

The rapid development of micro-thermal technologies has conveyed an increasing interest on convective boiling in micro-channels. Although there is general agreement that these systems may be able to dissipate potentially very high heat fluxes per unit volu ...

Springer-Verlag2009

Flow boiling in horizontal flattened tubes: Part I – Two-phase frictional pressure drop results and model

John Richard Thome, Jesus Moreno Quiben, Ricardo Lima

Experiments of diabatic two-phase pressure drops in flow boiling were conducted in four horizontal flattened smooth copper tubes with two different heights of 2 and 3 mm. The equivalent diameters of the flat tubes are 8.6, 7.17. 6.25, and 5.3 mm. The worki ...

2009

Status of prediction methods for critical heat fluxes in mini and microchannels

John Richard Thome, Rémi Revellin

Saturated critical heat flux (CHF) is an important issue during flow boiling in mini and microchannels. To determine the best prediction method available in the literature, 2996 data points from 19 different laboratories have been collected since 1958. The ...

Elsevier2009

Flow boiling in horizontal flattened tubes: Part II – Flow boiling heat transfer results and model

John Richard Thome, Jesus Moreno Quiben, Ricardo Lima

Experiments of flow boiling heat transfer were conducted in four horizontal flattened smooth copper tubes of two different heights of 2 and 3 mm. The equivalent diameters of the flattened tubes are 8.6, 7.17, 6.25, and 5.3 mm. The working fluids were R22 a ...

2009

Algebraic turbulence modeling in adiabatic gas–liquid annular two-phase flow

John Richard Thome, Andrea Cioncolini

The study considers algebraic turbulence modeling in adiabatic gas-liquid annular two-phase flow. After reviewing the existing literature, two new algebraic turbulence models are proposed for both the liquid film and the droplet laden gas core of annular t ...

Elsevier2009

Flow boiling in horizontal smooth tubes: New heat transfer results for R-134a at three saturation temperatures

John Richard Thome, Jesus Moreno Quiben, Ricardo Lima

The present study presents new flow boiling heat transfer results of R-134a flowing inside a 13.84 mm internal diameter, smooth horizontal copper tube. The heat transfer measurements were made over a wide range of test conditions: saturation temperatures o ...

2009

Transition of Bubbly Flow in Vertical Tubes: New Criteria Through CFD Simulation

John Richard Thome

The two fluid model is used to simulate upward gas-liquid bubbly flow through a vertical conduit. Coalescence and breakup of bubbles have been accounted for by embedding the population balance technique in the two fluid model. The simulation enables one to ...

2009

Critical Heat Flux During Flow Boiling in Microchannels: A Parametric Study

John Richard Thome, Rémi Revellin

The application of flow boiling in microchannels in copper cooling elements for very high heat flux dissipation from microprocessor chips is one of the promising technologies to replace air cooling and water cooling of these units, particularly in mainfram ...

Taylor & Francis2009

Unified macro-to-microscale method to predict two-phase frictional pressure drops of annular flows

John Richard Thome, Andrea Cioncolini

The study considers the prediction of pressure gradients in adiabatic gas-liquid annular two-phase flow in the macro-to-microscale range Twenty-four empirical correlations have been tested against an experimental data bank drawn together in this study cont ...

Elsevier2009

Flow boiling heat transfer of R134a, R236fa and R245fa in a horizontal 1.030mm circular channel

John Richard Thome, Chin Lee Ong

This research focuses on acquiring accurate flow boiling heat transfer data and flow pattern visualization for three refrigerants, R134a, R236fa and R245fa in a 1.030 mm channel. We investigate trends in the data, and their possible mechanisms, for mass fl ...

Elsevier2009

Flow boiling characteristics and flow pattern visualization of refrigerant/lubricant oil mixtures

John Richard Thome

A comprehensive review of flow boiling characteristics and flow pattern visualization of refrigerant/lubricant oil mixtures is presented in this paper. First, various parameters influenced by the lubricant oil in convective boiling of refrigerants, such as ...

Elsevier2009

Ammonia two-phase flow in a horizontal smooth tube: Flow pattern observations, diabatic and adiabatic frictional pressure drops and assessment of prediction methods

John Richard Thome, Jesus Moreno Quiben, Ricardo Lima

The present study illustrates new experimental two-phase flow pattern observations together with diabatic boiling and adiabatic two-phase frictional pressure drop results for ammonia (R7117) flowing inside a 14-mm internal diameter, smooth horizontal stain ...

2009

Effect of Inlet Orifice on Saturated CHF and Flow Visualization in Multi-microchannel Heat Sinks

John Richard Thome, Jung Eung Park, Bruno Michel

This article investigates the effect of inlet orifices on saturated critical heat flux (CHF) in multi-microchannel heat sinks. Two different multi-microchannel heat sinks made in copper were tested with three low pressure refrigerants (R134a, R236fa, R245f ...

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