Transferência de calor com interação de aletas e condutividade térmica variável

Abstract

The present work describes the thermal profile of a simple rectangular extended surface, perpendicular to its primary surface and in steady state, which dissipates heat considering thermal conduction, convection and radiation. Neumann and Dirichlet contour conditions are established, characterizing that heat dissipation occurs only on the fin faces, in addition to considering that the ambient temperature is homogeneous. Heat transfer analysis is performed by computational simulations using appropriate numerical methods. The Finite Difference Method is applied to the problem formulation. Since there is a great temperature difference between the primary surface and the ambient fluid, it is necessary to consider the thermal transfer effects. For the real situation approximation, the thermal conductivity of the material is considered as a function of temperature at each point, which makes the equation that model the nonlinear problem. It is considered the use of double fins, where their surfaces interact thermally, generating mutual effects. Finally, the comparison of the results obtained with typical results proves that the assumptions of variable thermal conductivity, heat dissipation by thermal radiation and mutual interaction are crucial to obtain results that are closer to reality.