Liquid backmixing in bubble columns and the axial dispersion coefficient

被引：41

作者：

Degaleesan, S ^{[1
]}

Dudukovic, MP ^{[1
]}

机构：

[1] Washington Univ, Dept Chem Engn, Chem React Engn Lab, St Louis, MO 63130 USA

来源：

AICHE JOURNAL | 1998年 / 44卷 / 11期

关键词：

D O I：

10.1002/aic.690441105

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Liquid backmixing in bubble columns is commonly described using the 1-D axial dispersion model, wherein all the contributing mechanisms leading to liquid macromixing are lumped into a single axial dispersion coefficient. No relationship has been reported that allows the quantification of various fluid-dynamic contributions to the axial dispersion coefficient in bubble columns. In this study, a Taylor-type analysis was performed to arrive at an expression for the axial dispersion coefficient in terms of the two dominant fluid-dynamic factors, convective recirculation and eddy diffusion. Experimental measurements of the relevant fluid-dynamic parameters are used to study the effects of operating conditions on the axial dispersion coefficient and its contributing factors.

引用

页码：2369 / 2378

页数：10

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