Abstract
ABSTRACT A numerical study of three-dimensional turbulent mixed convection in a ventilated, thermally insulated cavity containing a hot body (cylindrical or cubical) is conducted. The cavity has an inlet and an outlet in the bottom of the left wall and at the top of the right wall, respectively. The governing equations are solved using the finite volume method, and realizable k-ε turbulence model is adopted to predict turbulence. The influence of hot body on the ventilation efficiency is analyzed in terms of pathlines, temperature field, average Nusselt number (Nuavg ), turbulence characteristics and shape of the hot body by considering different Richardson numbers ranging from Ri = 0.01 to 30. A strong dependence between the heat transfer characteristic and Richardson number is observed, and the heat body geometry plays a significant role in ventilation efficiency. The average Nusselt number is significantly affected when Ri < 1; however, it remained nearly constant for values of Ri > 10. The Nuavg values on the cylindrical heat source are lower compared to those of the cubical heat source; however, the ventilation efficiency of the cavity including the cylindrical heat source is better.
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