Time-dependent fluid flow and heat transfer around a circular heated cylinder embedded in a horizontal packed bed of spheres

摘要

The present study numerically investigates the enhancement of forced convective heat transfer from a single circular cylinder embedded in a packed bed of spherical particles confined by two impermeable parallel plates. The heat transfer results from the heated cylinder, with and without the presence of a porous medium, are compared. The results show that the presence of the porous particles enhances the heat transfer from the cylinder; however, the significant heat transfer augmentation is produced at high Re due to the effect of thermal dispersion. In addition, the effect of Re on Nu_t is much greater than that of lc, and Bi in the porous channel. It is also found that the %Vp is much higher than %HTE producing from packing the empty channel.