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Experimental Characterization of Additively Manufactured Metallic Heat Exchangers

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

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

Numerical Modeling of Annular Laminar Film Condensation in Circular and Non-Circular Micro-Channels under Normal and Micro-Gravity

Stefano Nebuloni

A theoretical and numerical model to predict film condensation heat transfer in mini, micro and ultra micro-channels of different internal shapes is presented in this thesis. The model is based on a finite volume formulation of the Navier-Stokes and energy ...

EPFL2010

Heat Transfer Measurements in a Turbine Cascade: Taking Advantage of the Thermal Bahaviour of a PSP Sensor

Peter Ott, Magnus Jonsson

Film cooling experiments are commonly performed with Pressure Sensitive Paint (PSP). The oxygen sensitive probe molecules allow for measurement of the adiabatic film cooling effectiveness by detecting the concentration of a tracer-gas with different oxygen ...

2010

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 ...

Springer, 101 Philip Drive, Norwell, Ma 02061 Usa2010

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

Power Electronic components require cooling to limit junction temperatures to ensure long and reliable operation. Heat sinks are used for cooling the components. In applications which entail operation at altitudes, derating factors are provided by manufact ...

2009

Heat transfer to liquid metal: Review of data and correlations for tube bundles

Konstantin Mikityuk

Four sets of experimental data (total of 658 data points) for heat transfer to liquid metals (NaK of different compositions and Hg) flowing in a triangular or square lattice of cylindrical rods with pitch-to-diameter ratios of 1.1 up to 1.95 for a wide ran ...

Elsevier2009

Large Eddy Simulation of turbulent flow in heated curved ducts: influence of the Reynolds number

Large-Eddy Simulations (LES) of the turbulent compressible ow within heated curved ducts of square cross section are presented. The aim here is to predict the three- dimensional structures which develop inside cooling channels of rocket engines and study t ...

2005

Experimental two-phase fluid flow in microchannels

Rémi Revellin

Micro or mini heat spreaders are used in the interest of providing higher cooling capability for microtechnologies. Heat spreaders using micro or mini channels are not yet well studied, for this the fundamentals of two-phase heat transfer in microchannels ...

EPFL2005

Experimental investigation of heat transfer and flow characteristics in various geometries of 2-pass internal cooling passages of gas turbine airfoils

Denis Chanteloup

An experimental investigation of the flow and heat transfer characteristics in internal coolant passages of gas turbine airfoils has been conducted. The PIV method was employed for the flow measurements. A stereoscopic PIV system was used and automated. Th ...

EPFL2002