固定床吸附过程传热传质耦合影响数值模拟

引言 多孔介质中物质传递与热量传递相互影响,这种现象最早由Soret和Dufour提出1].由温度梯度作用产生的传质效应称为Soret效应(热附加扩散效应),它代表由温度场的不均匀性而导致的传质现象;由浓度梯度作用产生的传热效应称为Dufour效应(扩散附加热效应),它代表由浓度场的不均匀性而导致的传热现象.

Numerical simulation on fixed bed adsorption process with coupled effect of heat and mass transfer

To explore the coupled effect of heat and mass transfer, the coupled model of heat and mass transfer for a fixed bed adsorption process was established according to the Soret effect and the Dufour effect theory. Numerical analysis methods were adopted to discuss the influences of heat transfer coefficients, mass transfer coefficients, and the coupled effect of heat and mass transfer on the fixed bed adsorption process respectively. Results have shown that heat transfer coefficients have little effect on mass transfer. To the degree of influence on the temperature field, the greatest is the heat transfer coefficient, followed by the axial thermal conductivity, the smallest is the external heat transfer coefficient.  The mass transfer coefficients have some impact on the heat transfer and the mass transfer effect caused by the temperature gradient is more obvious than the heat transfer effect caused by the concentration gradient.