Análise computacional de um trocador de calor de tubos concêntricos

Abstract

This work aims to demonstrate the calculation of the average convective coefficient of the inner region and the annulus region of a double-pipe heat exchanger. However, obtain those coefficients are the problem of convection and them depend a series factors such as thermophysical properties of substances, surface geometry and flow conditions, so then the use of a computational tool is plausible approach to such phenomena. For computer analysis, it was created a hexahedral mesh from structured blocks which integrates the geometric domain and discretized using finite volume. The simulation uses the solvers from OpenFOAM, open source software used in Linux distributions, to calculate the the volume fields like, temperature, velocity and pression. For this work was obtained the temperature field over the geometry when the case reached steady state. Obtained by the rate equations for a heat flux at the point, the study shows the values of the convective coefficient and Nusselt number for laminar flow with the developed velocity profile for each region and validates the results from the analytical equations of Effectiveness Method - NUT.