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Study the heat and mass transfer in packed bed heat exchangers particularly  in nuclear application is subject of many new researches. In this paper  numerical analysis of forced convection heat transfer from two tandem  circular cylinders embedded in a packed bed, which is made of spherical  Aluminum particles, is investigated in laminar flow. The porous medium  increases the overall heat absorbed from two cylinders and cooling effect but  increases the pressure drop, significantly. Also, the effect of increase the  horizontal distance between two tandem circular cylinders on flow pattern and  heat transfer is investigated. For the empty channel, the total wall heat  flux in very small distances have a minimum due to generation of closed  vortex region and for longer distances, by increases the distance between two  tandem cylinder, the total wall heat flux increases. It is shown that for two  circular cylinders embedded in the packed bed, the total wall heat fluxes  from two cylinders and the fluid outlet temperature increase to a maximum  quantity and then decrease with negative gradient. Also, the quantities of  the empty channel are too smaller than the amounts of porous medium.

Numerical analysis of forced convection heat transfer from two tandem circular cylinders embedded in a porous medium