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ISSN Online: 2377-424X
ISBN CD: 1-56700-226-9
ISBN Online: 1-56700-225-0
International Heat Transfer Conference 13
A 3D COMPUTATIONAL MODEL OF HEAT TRANSFER COUPLED TO PHASE CHANGE IN MULTILAYER MATERIALS WITH RANDOM CONTACTS
Résumé
An improved understanding of the heat transfer in materials consisting of two layers (deposit and substrate) is essential in a number of industrial applications. We are interested in the deposition, rapid cooling and solidification of metal droplets (known as splats) brought into contact with a cold substrate. We therefore need to understand the temperature history in both the deposit and the substrate, including phase change phenomena. A 3D model of the thermal contact resistance is developed; it allows for a random distribution of contact points rather than the uniform contact which is classically used. Phase change has been also included by using the enthalpy-porosity formulation. Simulations have been conducted using a commercial package CFX-4. The computational results for the cooling rate of the splat obtained using the random contact distribution model, are in good agreement with the experimental results. In addition, results obtained using the random model indicate inhomogeneity in the temperature at the interface between the splat and the substrate related to the response of the material to the random contact distribution.