文献类型：期刊文献

英文题名：Effects of stagnant zone on the effectiveness factor in a trickle bed

作者：Tang, Yanling[1];Luo, Gang[1];Zhong, Juhua[2];Chen, Kaixuan[1];Xu, Chenqian[1];Cheng, Zhenmin[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Sci, Dept Phys, Shanghai 200237, Peoples R China

年份：2022

卷号：248

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20214411095151);WOS:【SCI-EXPANDED(收录号:WOS:000712996500001)】；

基金：The authors are grateful to the financial supports from the National Key R&D Program of China (No. 2019YFC1906705) and National Natural Science Foundation of China (No. 21676085) .

语种：英文

外文关键词：Trickle-bed reactor; Particle-string model; External mass transfer; Liquid flow texture; Effectiveness factor

摘要：Industrial trickle-bed reactors are normally operated under complete wetting conditions, almost 20-30% of the particle external surface is covered by stagnant liquid. To investigate the influence of stagnant zone on the effectiveness factor, a multi-particle string model is studied by CFD simulation, with a high-speed video camera verifying the validity of simulation. It shows that stagnant liquid in liquid pendulum and liquid pocket would cause obvious external mass transfer limitation at high Thiele moduli, yet the effects of liquid pocket are more serious than liquid pendulum. The effects of liquid velocity, particle diameter, and particle number on effectiveness factor are evaluated. The effectiveness factor belonging to single particle due to absence of liquid pocket is higher than that of a multi-particle string, while the three-particle string model is similar to the four-particle approach, which indicates simulation of effectiveness factor in a trickle bed can be approximated by a three-particle string. (c) 2021 Elsevier Ltd. All rights reserved.