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John Richard Thome

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Publications associées (260)

Development of interconnected silicon micro-evaporators for the on-detector electronics cooling of the future ITS detector in the ALICE experiment at LHC

John Richard Thome, Alessandro Mapelli, Giulia Romagnoli, Andrea Francescon

The thermal management of the on-detector electronics and the development of low mass integrated cooling systems have become a crucial task in the design of silicon tracking detectors for high energy physics applications. The use of microfabricated ultra-t ...

Pergamon-Elsevier Science Ltd2016

A CFD study of the parameters influencing heat transfer in microchannel slug flow boiling

John Richard Thome, Mirco Magnini

Boiling heat transfer in microchannels has been investigated extensively in the last two decades. However, most results from independent experimental studies display a substantial disagreement on the influence of the flow conditions and mechanisms on the h ...

Elsevier France-Editions Scientifiques Medicales Elsevier2016

Two-Phase Mini-Thermosyphon Electronics Cooling, Part 4: Application to 2U Servers

John Richard Thome, Chin Lee Ong, Jackson Braz Marcinichen, Nicolas Lamaison

This paper is the fourth part of the present study on two-phase mini-thermosyphon cooling. As mentioned in the first three parts, gravity-driven cooling systems using microchannel flow boiling can become a long-term scalable solution for cooling of datacen ...

Ieee2016

Working fluid charge reduction. Part II: Supercritical CO2 gas cooler designed for light commercial appliances

John Richard Thome, Jackson Braz Marcinichen

The present study focused on the thermal hydraulic performance improvement of a CO2 gas cooler with the principal goal of reducing its volume, and consequently the necessary charge of the working fluid. To achieve this compactness, the leading methods for ...

Elsevier Sci Ltd2016

A study of gravitational effects on single elongated vapor bubbles

John Richard Thome, Mirco Magnini

An experimental study was completed on the heat transfer induced by a single elongated vapor bubble rising in vertical, upward, co-current flow at various accelerations. The bubble shape and behavior were also studied under those conditions. Tests were con ...

Pergamon-Elsevier Science Ltd2016

Two-Phase Mini-Thermosyphon Electronics Cooling, Part 1: Experimental Investigation

John Richard Thome, Chin Lee Ong, Jackson Braz Marcinichen, Nicolas Lamaison

Efficient, small, state-of-the-art passive cooling two-phase systems, i.e. advanced micro-thermosyphon cooling systems, are viable solutions for high performance datacenter servers and power electronics cooling applications. The objective of this study is ...

Ieee2016

Flow boiling and frictional pressure gradients in plate heat exchangers. Part 1: Review and experimental database

John Richard Thome, Farzad Vakili Farahani, Raffaele Luca Amalfi

This two-part paper presents an overview of evaporation heat transfer mechanisms, a review of the experimental and prediction methods and a creation of a consolidated multi-lab database of 3601 data points and provides a detailed comparison of all the pred ...

Elsevier Sci Ltd2016

Two-Phase Mini-Thermosyphon Electronics Cooling, Part 3: Transient Modeling and Experimental Validation

John Richard Thome, Chin Lee Ong, Jackson Braz Marcinichen, Nicolas Lamaison

This paper is the third part of the present study on two-phase mini-thermosyphon cooling systems. As mentioned in the first two parts, gravity-driven cooling systems using microchannel flow boiling are a very promising long-term viable solution for electro ...

Ieee2016

Experimental investigation on flow boiling pressure drop and heat transfer of R1233zd(E) in a multi-microchannel evaporator

John Richard Thome, Navid Borhani, Houxue Huang

An experimental study on flow boiling pressure drop and heat transfer of a new environmentally friendly refrigerant R1233zd(E), in a parallel multi-microchannel evaporator was carried out. The silicon microchannels evaporator was 10 mm long and 10 mm wide, ...

Pergamon-Elsevier Science Ltd2016

Two-Phase Mini-Thermosyphon Electronics Cooling, Part 2: Model and Steady-State Validations

John Richard Thome, Chin Lee Ong, Jackson Braz Marcinichen, Nicolas Lamaison

In the present study, a simulation code specifically developed to evaluate the thermal-hydraulic performance of thermosyphon cooling loops is validated through the experimental results obtained in the Part 1. It considers levels of heat load conventionally ...

Ieee2016

Critical heat flux: Performance of R1234yf, R1234ze and R134a in an aluminum multi-minichannel heat sink at high saturation temperatures

John Richard Thome

In this paper, new saturated critical heat flux (CHF) values at medium-to-high saturation temperatures are presented for an aluminum multi-minichannel test section. Among the possible working fluids, R134a and the low GWP refrigerants R1234yf and R1234ze h ...

Elsevier France-Editions Scientifiques Medicales Elsevier2016

Thermal Response of Multi-Microchannel Evaporators During Flow Boiling of Refrigerants Under Transient Heat Loads With Flow Visualization

John Richard Thome, Navid Borhani, Houxue Huang

Multi-microchannel evaporators with flow boiling, used for cooling high heat flux devices, usually experience transient heat loads in practical applications. These transient processes may cause failure of devices due to a thermal excursion or poor local co ...

Asme2016

Working fluid charge reduction, part 1: CO2 fin-tube evaporator designed for light commercial appliances utilizing flow pattern based phenomenological prediction models

John Richard Thome, Jackson Braz Marcinichen

The present study focused on improving the thermal performance of CO2 evaporators while reducing their volume and thus significantly reducing the working fluid charge. To achieve this, the leading two-phase flow pattern and physically-based prediction mode ...

Elsevier Sci Ltd2016

Time-strip visualization and thermo-hydrodynamics in a Closed Loop Pulsating Heat Pipe

John Richard Thome, Navid Borhani, Giulia Spinato, Brian Paul D'Entremont

New trends in the microprocessor industry are leading not only to miniaturization and integration but also to increases in power dissipation rates which now require advanced cooling solutions to prevent thermal damage to the devices. Pulsating heat pipes ( ...

Elsevier2015

Dynamics of isolated confined air bubbles in liquid flows through circular microchannels: an experimental and numerical study

John Richard Thome, Navid Borhani, Sepideh Khodaparast, Mirco Magnini

Experimental and numerical studies are performed to characterise the dynamics of isolated confined air bubbles in laminar fully developed liquid flows within channels of diameters d = 0.5 mm and d = 1 mm. Water and glycerol are used as the continuous liqui ...

Springer Verlag2015

Understanding the self-sustained oscillating two-phase flow motion in a closed loop pulsating heat pipe

John Richard Thome, Navid Borhani, Giulia Spinato

In the framework of efficient thermal management schemes, pulsating heat pipes (PHPs) represent a breakthrough solution for passive on-chip two-phase flow cooling of micro-electronics. Unfortunately, the unique coupling of thermodynamics, hydrodynamics and ...

Pergamon-Elsevier Science Ltd2015

Design and packaging of a highly integrated microreactor system for high-temperature on-board hydrogen production

Thomas Maeder, Paul Muralt, John Richard Thome, Navid Borhani, Dimos Poulikakos, Bo Jiang

Highlights • A “plug-and-play” microreaction system for high-temperature reactions (>500 °C). • Efficient thermal decoupling for using standard electrical/fluidic connections. • Automatic and accurate temperature control for calorimetric measurements. • A ...

Elsevier2015

An indirect criterion for the laminar to turbulent flow transition in shear-driven annular liquid films

John Richard Thome, Andrea Cioncolini

An indirect method to identify the laminar to turbulent flow transition in shear-driven annular liquid films has been developed and used, together with literature measurements of the velocity profile, to approximately resolve the near wall structure in she ...

Pergamon-Elsevier Science Ltd2015

ALE/finite element modeling of an unconfined bubble plume in periodic domain: bubble shape and oscillation analysis

John Richard Thome, Gustavo Rabello Dos Anjos, Gustavo Charles Peixoto de Oliveira

This paper introduces a numerical model developed based upon the arbitrary Lagrangian-Eulerian/finite element scheme to analyze bubble plumes in a periodic domain. A spherical air bubble is immersed into a large pool of quiescent water to act as an unconfi ...

Springer Heidelberg2015

Flow boiling data and prediction method for enhanced boiling tubes and tube bundles with R-134a and R-236fa including a comparison with falling film evaporation

John Richard Thome, Eugene van Rooyen

New enhanced boiling tubes from Wolverine Tube Inc. (Turbo-B5) and Wieland-Werke AG (Gewa-B5) were investigated using R-134a and R-236fa as test fluids. The tests were done at saturation temperatures of 5 and 15 degrees C, mass flow rates from 4 to 35 kg m ...

Elsevier Sci Ltd2014

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