Numerical Simulation Of Heat And Mass Transfer Of Permeability Wall's Effects In Porous Medium With Surface Heat Flux

With highly developed inner solid surface and excellent property of heat transfer and heat storage, porous medium can play an important role in many fields. In recent years, the porous media is extensively used in fuel cell. The thesis presents intensive investigation on flow in porous medium by theoretical analysis, numerical simulation. The fluid flow, heat and mass transfer through the porous media channels with permeability wall is specially paid attention in the thesis. The main works are as follows:1. Applying the principle of fluid dynamics, a set of governing transport equations are derived to describe the flow through inner and isotropic porous medium based on volume averaged hypothesis and previous researchers' investigation. Considering local thermal non-equilibrium between the solid and fluid. The equations can be used to describe the heat and mass transfer in porous medium.2. Comparing the differences between Darcy law and extended Darcy law. Analyzing the applicability to modify the governing equations.3. Comparing the different schemes applying for numerical simulation. Choosing mesh generation method, discretized scheme and compose the program. Verifying the computing results.4. Forced convection heat and mass transfer in a saturated porous media channel with wall through which heat and mass transfer was numerically simulated by using the Darcy model. The governing equations were discretized on collocated grid by means of the finite volume method. The QUICK scheme has been used in the convective terms while the differencing scheme in diffusion terms. The SIMPLE algorithm has been employed to decouple the velocities and pressure. With the developed code, simulations dealing with flow, temperature and concentration fields were carried out in different porosities, boundary temperatures and concentrations. Meanwhile, the effects of these conditions on Nusselt and Sherwood numbers have been obtained. The results show that the heat and mass permeable wall has an insignificance effect on reducing heat transfer in the front of the channel with the heating area.