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Experimental study of the effects of a transversal air-flow deflector in electronics air-cooling

Journal of Thermal Science 2011年第1期20卷 76-81页

作者： M.rEBAY A.ArFAOUI J.PADET r.ben maad Université de reims GRESPI/lab.de ThermomécaniqueFaculté des sciencesBP 103951687 ReimsFrance Laboratoire d'Energétique et Transferts Thermique et Massique Faculté des sciences2092 Manar IITunisia

This paper presents an experimental investigation of the influence of a transversal flow deflector on the cooling of a heated block mounted on a flat *** deflector is inclined and therefore it guides the air flow to the upper surface of the *** configuration is simulating the air-cooling of a rectangular integrated circuit or a current converter mounted on an electronic *** electronic component is assumed dissipating low heat power,as such,air forced convection is still a sufficient cooling way even without fan or heat sink on the *** measurements are given by hot and cold wires anemometers and by an Infrared *** results give details of the effects of the deflection on the hydrodynamic and the thermal fields on and over the block for different inclination *** show that the deviation caused by the deflector may significantly enhance the heat transfer from the *** is also able to avoid local overheating of the electronic *** heat transfer rate and homogenised temperature are shown to be obtained with an inclination angle =30°.

关键词： Electronic cooling infrared imaging hot wire anemometer upward facing step backward facing step

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Improvement of the Pulsed Photothermal Technique for the Measurement of the Convective Heat Transfer Coefficient

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Journal of Thermal Science 2010年第4期19卷 357-363页

作者： M.rebay A.Arfaoui G.Mebarki r.ben maad J.Padet University of reims GRESPI/Lab de ThermomecaniqueFaculte des SciencesB.P.103951687 ReimsFrance University of Tunis EL MANAr LETTMFaculte des Sciences2092 Manar ⅡTunisia

The present study concerns the measurement of the convective heat transfer coefficient on the solid-fluid interface by the pulsed photothermal *** non-intrusive technique is apphed for the measurement of the local heat transfer coefficients in cooling of a rectangular slab that simulates an electronic *** heat transfer coefficient is deduced from the evolution of the transient temperature induced by a sudden deposit of a luminous energy on the front face of the *** order to draw up the heat transfer cartography by a non-destructive tool, the infrared thermography has been *** inverse techniques for the identification of the heat transfer coefficient are presented *** first one is based on the assumption that heat transfer coefficient remains constant during the pulsed experiment,and the second one considered it variable in space and *** temporal and spatial evolutions are expressed as a constant heat transfer coefficient(h_0)multiplied by a function of time and space f(x,t).The function f is deduced from the resolution of the conjugated convection-conduction problem,by a control volume technique for the case of thermally thick *** results are given for different air velocities and deflection angles of the flow.

关键词： pulsed method infrared thermography convective heat transfer inverse method.

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