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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of endothermic reaction mechanisms on the coupled heat and mass transfers in a porous packed bed with Soret and Dufour effects
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Effect of endothermic reaction mechanisms on the coupled heat and mass transfers in a porous packed bed with Soret and Dufour effects

机译：吸热反应机理对具有Soret和Dufour效应的多孔填充床中传热和传质耦合的影响

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摘要

Taking the influences of chemical reaction mechanisms into account, a mathematical model has been developed to simulate the coupled heat and mass transfer as well as endothermic reactions in a non-thermal equilibrium packed bed with Soret and Dufour effects, which was numerically solved and validated by comparing with experimental data. It was found that the chemical reaction mechanisms have a great influence on the calculated solutions, and the cross-diffusion effects on the reactive characteristics of the packed beds are diverse under different chemical reaction mechanism. For the heat transfer controlled mechanism, the maximum reductions of the concentration of gas product and the solid fractional conversion induced by the Soret and Dufour effects are 25.1% and 14.4% respectively at superficial velocity 53.3 cm s~(-1) and the Nusselt number 4.1. However for the mass transfer controlled model, the calculated solid fractional conversions are higher than that obtained by neglecting the cross-diffusion effects and the increase being less than 16% at superficial velocity 11.9 cm s~(-1) and the Sherwood number 47.1. The differences induced by the Soret and Dufour effects are demonstrated numerically to increase gradually with the Nusselt number or the Sherwood number.
机译：考虑到化学反应机理的影响，建立了数学模型以模拟具有Soret和Dufour效应的非热平衡填充床中的传热和传质以及吸热反应，并通过数值方法进行了求解和验证与实验数据进行比较。结果表明，化学反应机理对计算溶液的影响很大，在不同的化学反应机理下，交叉扩散对填充床反应特性的影响也不同。对于传热控制机理，在表层速度53.3 cm s〜（-1）和Nusselt数下，Soret和Dufour效应引起的气体产物浓度和固体分数转化率的最大降低分别为25.1％和14.4％。 4.1。然而，对于传质控制模型，所计算的固体分数转化率要高于忽略交叉扩散效应而获得的转化率，在表观速度11.9 cm s〜（-1）和舍伍德数为47.1时，其增加率小于16％。从数值上证明了Soret和Dufour效应引起的差异随Nusselt数或Sherwood数逐渐增加。

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