多孔介质在压力梯度作用下的热质耦合数值模拟

多孔介质干燥导致热质耦合传输过程。本文基于连续介质力学的宏观尺度，对多孔介质的热、湿和气三者耦合迁移进行数值模拟，研究压力梯度对热质传输的影响。多孔介质传质机理主要为水汽和空气的对流和扩散传输、吸附水在含湿量梯度作用下的自由扩散和其在温度梯度即Soret效应驱动下的流动。采用Galerkin加权余量的有限元方法，提出了...

Numerical simulation of coupled heat and mass transfer under the effect of pressure gradient in porous media

Drying porous media leads to a coupled process of heat and mass transfer. Based on the macroscopic viewpoint of continuum mechanics, coupled heat, moisture movement and gas phase flow is numerically simulated. The effect of pressure gradient on the heat and mass transfer is studied. Diffusional and convectional flow of water vapor and air; moisture flow driven by gradient of moisture and temperature (Soret effect) are basic mechanisms of mass transfer in porous media. A 3-D coupled model under Dirichlet and mixed type of boundary conditions, based on the Galerkin weighted residual finite element method, is presented to account for the coupling among temperature, moisture content and gas pressure of the porous media dried at high temperature.