Transient heat and mass transfer by natural convection from vertical surfaces in porous media

摘要

A study on the transient heat and mass transfer from vertical plates embedded in fluid saturated porous media is conducted. The wall temperature and concentration are power functions of the dimensionless streamwise coordinate. Results for the heat and mass transfer rates are obtained for different values of the Lewis number, the buoyancy ratio, the power-law exponent and the ratio of porosity and heat capacity ratio. The transient local Nusselt number at X = 1 is found to be almost independent of the ratio of porosity and heat capacity ratio, while the transient local Sherwood number at X = 1 tends to increase as the ratio of porosity and heat capacity ratio is increased. Moreover, increasing the power-law exponent increases the transient local Nusselt and Sherwood numbers. [References: 14]