Numerical study of mixed convection in a ventilated square enclosure with the lattice Boltzmann method

摘要

In this article, numerical study of heat transfer by convection in a square cavity was investigated. The vertical walls of the cavity are differentially heated and the horizontal walls are considered adiabatic. A ventilation jet is created by a fan placed in the cavity. A lattice Boltzmann model for incompressible flow equation is used to simulate the problem. A parametric study was performed presenting the influence of Reynolds number (20 <= Re <= 500), Rayleigh number (10 <= Ra <= 10(+6)), and fan position (0.2 <= L-F <= 0.8). It has been observed that heat transfer rate increases with the Reynolds number increasing and it is maximal for the L-F=0.2.