Model for heat and moisture transfer in arbitrarily shaped two-dimensional porous media
1994
Casada, M.E. | Young, J.H.
A model was developed to predict heat and moisture transfer due to natural convection and diffusion in arbitrarily shaped two-dimensional porous media. Boundary conditions were diurnally varying ambient temperature on the outside of walls with moderate Biot number. Other important boundary conditions were developed for typical storage and transportation situations. A two-energy equation model was used to allow for the difference between the fluid and solid temperatures and its effect on mass transfer in the porous medium. The governing equations were solved with a finite-difference method in a generalized coordinate system using a stream function formulation. It was found that the energy and moisture transport equations were best solved using a modified Crank-Nicolson method that was developed to control the tendency for instability caused by the source terms in these equations. All of the boundary conditions that were developed worked satisfactorily. The two-energy equation model predicted small differences between the fluid and solid particle temperatures and natural convection only impacted the temperature solution significantly in the upper comers of the porous media.
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