The Soret and Dufour Effects in Non-thermal Equilibrium Packed Beds with Forced Convection and Endothermic Reactions

doi:10.1016/S1004-9541(13)60502-X

Chin.J.Chem.Eng. ›› 2013, Vol. 21 ›› Issue (8): 867-875.DOI: 10.1016/S1004-9541(13)60502-X

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The Soret and Dufour Effects in Non-thermal Equilibrium Packed Beds with Forced Convection and Endothermic Reactions

LI Mingchun, ZHAO Zhongliang, JING Yu, LIU Jiatao, WU Yusheng

School of Material Science and Engineering, Shenyang University of Technology, Shenyang 110023, China

Received:2011-11-14 Revised:2012-10-07 Online:2013-08-24 Published:2013-08-28
Supported by:
Supported by the National Natural Science Foundation of China (51004071, 51164015), Special Project for High-end CNC Machine Tools and Basic Manufacturing Equipment of China (2012ZX04007-021) and Liaoning Province College Excellent Talents Fund Project (LJQ2013012).

The Soret and Dufour Effects in Non-thermal Equilibrium Packed Beds with Forced Convection and Endothermic Reactions

李明春, 赵中亮, 静宇, 刘家涛, 吴玉胜

School of Material Science and Engineering, Shenyang University of Technology, Shenyang 110023, China

通讯作者: LI Mingchun
基金资助:
Supported by the National Natural Science Foundation of China (51004071, 51164015), Special Project for High-end CNC Machine Tools and Basic Manufacturing Equipment of China (2012ZX04007-021) and Liaoning Province College Excellent Talents Fund Project (LJQ2013012).

Abstract

Abstract: To study the influence of the Soret and Dufour effects on the reactive characteristics of a porous packed bed with endothermic reactions and forced convection, a two-dimensional mathematical model considering the cross-diffusion effects was developed in accordance with the thermodynamics of irreversible processes and the local thermal non-equilibrium model. The simulation results were validated by comparing with experimental data. The influence of the Soret and Dufour effects on the heat transfer, mass transfer and endothermic chemical reaction in the non-thermal equilibrium packed bed is discussed. It was found that when the Peclet number reaches 1865, the maximum relative error of the concentration of gas product induced by the Soret effect is 34.7% and that of the solid fractional conversion caused by the Dufour effect is 10.8% at reaction time 160 s and initial temperature 1473 K. The differences induced by the Soret and Dufour effects are demonstrated numerically to increase gradually with the initial temperature of feeding gas and the Peclet number.

Key words: heat and mass transfer, thermal decomposition, cross-diffusion effects, porous packed bed

摘要： To study the influence of the Soret and Dufour effects on the reactive characteristics of a porous packed bed with endothermic reactions and forced convection, a two-dimensional mathematical model considering the cross-diffusion effects was developed in accordance with the thermodynamics of irreversible processes and the local thermal non-equilibrium model. The simulation results were validated by comparing with experimental data. The influence of the Soret and Dufour effects on the heat transfer, mass transfer and endothermic chemical reaction in the non-thermal equilibrium packed bed is discussed. It was found that when the Peclet number reaches 1865, the maximum relative error of the concentration of gas product induced by the Soret effect is 34.7% and that of the solid fractional conversion caused by the Dufour effect is 10.8% at reaction time 160 s and initial temperature 1473 K. The differences induced by the Soret and Dufour effects are demonstrated numerically to increase gradually with the initial temperature of feeding gas and the Peclet number.

关键词: heat and mass transfer, thermal decomposition, cross-diffusion effects, porous packed bed

LI Mingchun, ZHAO Zhongliang, JING Yu, LIU Jiatao, WU Yusheng. The Soret and Dufour Effects in Non-thermal Equilibrium Packed Beds with Forced Convection and Endothermic Reactions[J]. Chin.J.Chem.Eng., 2013, 21(8): 867-875.

李明春, 赵中亮, 静宇, 刘家涛, 吴玉胜. The Soret and Dufour Effects in Non-thermal Equilibrium Packed Beds with Forced Convection and Endothermic Reactions[J]. Chinese Journal of Chemical Engineering, 2013, 21(8): 867-875.

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The Soret and Dufour Effects in Non-thermal Equilibrium Packed Beds with Forced Convection and Endothermic Reactions

The Soret and Dufour Effects in Non-thermal Equilibrium Packed Beds with Forced Convection and Endothermic Reactions

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