Publications associées à Investigation of Flow Boiling in Horizontal Tubes: Part II, Development of a New Heat Transfer Model for Stratified-Wavy, Dryout and Mist Flow Regimes

Publications associées (17)

Experimental study of the hydrodynamic and thermal performances of ventilated wall structures

The presence of a ventilated air gap behind the external cladding in a building envelope is known to have a tangible contribution to the overall performance of the wall assembly. In the present study, the hydrodynamic and thermal performances of ventilated ...

2023

Flow boiling heat transfer and two-phase flow phenomena of CO2 in macro-and micro-channel evaporators: Fundamentals, applications and engineering design

John Richard Thome

The paper presents a comprehensive review of fundamentals and engineering applications of CO2 flow boiling heat transfer, flow patterns and two-phase pressure drops in macro- and micro-channel evaporators. First, distinctions of macro- and micro-channels a ...

PERGAMON-ELSEVIER SCIENCE LTD2021

Microchannel-based Calorimeter for Rapid and Accurate Loss Measurements on High-efficiency Power Converters

Elison de Nazareth Matioli, Remco Franciscus Peter van Erp, Palliyage Srilak Nirmana Perera

The difficulty in accurately measuring losses in high-frequency power converters hinders accurate breakdown of losses which is essential for device and circuit optimization. Electrical methods are often not adequate and calorimetric approaches found in the ...

IEEE2021

General Thermosyphon Simulation Code for Electronics Cooling Applications

John Richard Thome, Filippo Cataldo

Two-phase micro-scale cooling implemented with passive, gravity-driven closed-loop thermosyphons represents a highly-reliable solution to increase heat dissipation and to maximize energy efficiency of the next-generation electronics cooling technologies. T ...

IEEE2020

Replicated microcellular aluminium structures for thermal management

Alexandros Athanasiou-Ioannou

Open-pore aluminium foams are of interest in thermal management of power electronics due to their large specific surface area, low weight and relatively high thermal conductivity. The replication process is a low-cost and simple foam manufacturing method t ...

EPFL2017

High resolution local heat transfer and pressure drop infrared measurements of two-phase flow of R245fa within a compact plate heat exchanger

John Richard Thome, Raffaele Luca Amalfi

An experimental study is presented to characterize two-phase thermal and hydraulic performance of a prototype corrugated plate heat exchanger with small pressing depth. In particular, upward flow boiling of low pressure refrigerant R245fa was investigated ...

Pergamon-Elsevier Science Ltd2016

Effect of Varying Jet Diameter on the Heat Transfer Distributions of Narrow Impingement Channels

Peter Ott, Bernhard Weigand, Alexandros Terzis

The development of integrally cast turbine airfoils allows the production of narrow impingement channels in a double-wall configuration, where the coolant is practically injected within the wall of the airfoil providing increased heat transfer capabilities ...

Asme2015

Detailed heat transfer distributions of narrow impingement channels for integrally cast turbine airfoils

Alexandros Terzis

EPFL2014

On The Strategies Towards Isothermal Gas Compression And Expansion

Alfred Rufer, Sylvain Lemofouet-Gatsi, Mahbod Heidari

Isothermal compression/expansion is regarded as the most promising process in many applications and many researchers and inventors have tried different methods to achieve this goal. The current article first studies the gradual roadmap from adiabatic towar ...

2014

Heat transfer through cable insulation of Nb-Ti superconducting magnets operating in He II

Pier Paolo Granieri

The operation of Nb–Ti superconducting magnets in He II relies on superfluidity to overcome the severe thermal barrier represented by the cable electrical insulation. In wrapped cable insulations, like those used for the main magnets of the Large Hadron Co ...

Elsevier2013

Flow Boiling Characteristics for R1234ze(E) in 1.0 and 2.2 mm Circular Channels

John Richard Thome, Cristiano Bigonha Tibiriça

Experimental flow boiling heat transfer results are presented for horizontal 1.0 and 2.2 mm I. D. (internal diameter) stainless steel tubes for tests with R1234ze(E), a new refrigerant developed as a substitute for R134a with a much lower global warming po ...

2012

Swirl Jet and Crossflow Interaction at Low Velocity Ratios and Incompressible Flows

Peter Ott, Alexandros Terzis

Swirl jets in crosflow are investigated experimentally and numerically. The main difference with non-swirl cases is an asymmetry of the dominant kidney vortex and a slight distortion of the jet trace downstream of the injection hole. Jet rotation, at relat ...

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

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

John Richard Thome, 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

Comparison of Numerical Investigations With Measured Heat Transfer Performance of a Film Cooled Turbine Vane

Peter Ott, Magnus Jonsson, Dominique Charbonnier

Detailed surface measurements of the heat transfer coefficient and the film cooling effectiveness by application of the transient liquid crystal method were carried out on a heavily film cooled nozzle guide vane (NGV) in a linear cascade wind tunnel at the ...

American Soc Mechanical Engineers, Three Park Avenue, New York, Ny 10016-5990 Usa2008

Experimental investigations of showerhead film cooling on the leading edge of a turbine blade

Guillaume Wagner

The turbine components of a gas turbine need extensive cooling to withstand the high heat loads generated by the flow of the hot combustion gases. The leading edge of a turbine blade is one of the areas that faces the hottest gas flow conditions and is thu ...

EPFL2007

A comparative study on showerhead cooling performance

Peter Ott, Bernhard Weigand, Céline Falcoz

2006