Storage Silos Self Ventilation: Interlinked Heat and Mass Transfer Phenomenon

Abstract

This work is to better understand heat and mass transfer by natural convection in a vertical, open ended, and porous cylinder. The effects of buoyancy forces and chemical reaction on the natural convection are studied numerically and discussed for a large range of Rayleigh number (Ra _T ), buoyancy ratio (N), and reaction rate (Ak). A map diagram (Ra _T , A, Ak) of the two observed flow types, with and without fluid recirculation, was obtained. The analysis shows that the results strongly depend on the controlling parameters and demonstrates the effect on the recirculating possible flow. Thus, it's confirmed that the rate of heat transfer increases with increasing Rayleigh, and it is particularly sensitive to the values of dimensionless reaction rate (Ak) and aspect ratio (A).