多孔介质反应体系中的耦合扩散效应  

Cross-diffusion effect in porous medium with endothermic chemical reaction

作　　者：李明春[1] 田彦文[2] 翟玉春[2] 

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110023 [2]东北大学冶金物理化学所,辽宁沈阳110004

出　　处：《化工学报》2008年第10期2455-2459,共5页CIESC Journal

基　　金：国家自然科学基金项目(50174015)~~

摘　　要：A porous medium involving endothermic chemical reaction was studied by using the irreversible flow processes thermodynamics method.A mathematical model describing the coupled irreversible processes of heat transfer,mass transfer and chemical reaction in porous medium was established,and the model was solved numerically by applying the finite volume implicit method.By taking the decomposition of limestone as a case,the effects of the Soret and the Dufour phenomena were analyzed.The results showed that when the Peclet module was lower,the effects of the Soret and the Dufour phenomena could not be ignored.As a result,the product gas and the quantity of heat of gas in the porous medium would come through the reactor much quicker,and the concentration of the product gas,the temperature of gas flow and the solid conversion degree would be lower.A porous medium involving endothermic chemical reaction was studied by using the irreversible flow processes thermodynamics method. A mathematical model describing the coupled irreversible processes of heat transfer, mass transfer and chemical reaction in porous medium was established, and the model was solved numerically by applying the finite volume implicit method. By taking the decomposition of limestone as a case, the effects of the Soret and the Dufour phenomena were analyzed. The results showed that when the Peclet module was lower, the effects of the Soret and the Dufour phenomena could not be ignored. As a result, the product gas and the quantity of heat of gas in the porous medium would come through the reactor much quicker, and the concentration of the product gas, the temperature of gas flow and the solid conversion degree would be lower.

关 键 词：多孔介质 吸热反应 Soret效应 Dufour效应 

分 类 号：TF01[冶金工程—冶金物理化学]