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International Heat Transfer Conference 11

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

EXPERIMENTAL DETERMINATION OF THERMAL CONTACT RESISTANCE OF CONTROLLED INTERFACE GEOMETRY

A-S. Marchand
Centre de Thermique de Lyon, ESA CNRS 5008 Institut National des Sciences Appliquees de Lyon 20 Avenue Albert Einstein 69621 Villeurbanne Cedex France

Martin Raynaud
Centre de thermique de Lyon, UMR CNRS 5008, INSA, Bât. Sadi Carnot, 20, Av. A. Einstein,69621 Villeurbanne Cedex, France

M. Laurent
Centre de Thermique de Lyon, ESA CNRS 5008 Institut National des Sciences Appliquées de Lyon 20 Avenue Albert Einstein 69621 Villeurbanne Cedex France

Patrice Chantrenne
Centre de thermique de Lyon, UMR CNRS 5008, INSA, Bât. Sadi Carnot, 20, Av. A. Einstein,69621 Villeurbanne Cedex, France

Abstract

The accuracy of thermal-mechanical models of the hot/warm forging process depends on the proper description of the overall boundary conditions. At the hot workpiece/cold tool interface, this requires the knowledge of the Thermal Contact Resistance (TCR). A numerical study was realised to estimate the TCR between the tool and the workpiece during forging processes. An experimental set-up was designed to compare experimental and theoretical values of TCR. In order to control the contact geometry, one of the samples has smooth surfaces (Ra=0.01 nm), the other one has a rough controlled surface. Work-hardenned copper sample were chosen and their surfaces were manufactured by a Nano-mechanic laboratory. Two sizes of 2D triangular asperities were machined. Since the interface geometry is accurately known, the comparison of the experimental determination of the TCR to the ones obtained from the numerical model is possible. The objective of this paper is to present the results of the TCR determined for various interface pressures and for the two triangular asperity sizes. A comparison between the TCR determined under steady state and transient regime is done. The TCR determined for the two interface geometries and from the numerical simulations are also compared.

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