Avaliação numérica de um descritor invariante do resfriamento conjugado por convecção forçada-condução de aquecedores 3D discretos em canais

Abstract

In this Course Completion Work was performed a numerical evaluation of an invariant descriptor of the conjugate forced convection-conduction heat transfer process of discrete heaters in channel flow, through gathering the conjugate influence coefficients g+, grouped in a conjugate matrix G+. With this descriptor, the temperature of each 3D protruding heater assembled on a conductive substrate in a horizontal rectangular channel can be predicted by the knowledge of arbitrary rates of heat dissipation on the heaters. In the numerical simulations, the governing equations with their boundary conditions were numerically solved within a single domain comprising the solid and fluid regions, by a coupled procedure, using the Control Volumes Method through the ANSYS/FluentTM 19.2 commercial software. In order to obtain results, typical values of geometries and thermophysical properties found in applications of electronic component cooling classified at Level 2 of electronic packing associated to thermal control of 3D protruding heaters assembled in a printed circuit board were used. Some examples have been illustrated, indicating the effects in conjugate influence coefficients of the substrate thermal conductivity and the Reynolds number of the channel flow. A comparison with experimental results was done and showed great agreement.