Distribution of particles during solvent evaporation from films

被引：163

作者：

Routh, AF ^{[1
]}

Zimmerman, WB ^{[1
]}

机构：

[1] Univ Sheffield, Dept Chem & Proc Engn, Sheffield S1 3JD, S Yorkshire, England

来源：

CHEMICAL ENGINEERING SCIENCE | 2004年 / 59卷 / 14期

关键词：

evaporation; films; colloidal phenomena; drying; numerical analysis; particles;

D O I：

10.1016/j.ces.2004.04.027

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

We examine films, subject to evaporation, that contain particles. The volume fraction of particles increases as solvent is removed up to a maximum value of close packing. The governing equation for evolution of particle volume fraction is derived and numerical solutions obtained for various Peclet numbers. For large Peclet numbers an asymptotic solution gives the position and functional form of a front of close packed particles which passes through the film. For intermediate Peclet numbers the scaling for the spatial gradient in volume fraction is found to be Pe(1/2). This is different from conventional sedimentation, where convection rather than diffusion dominates. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：2961 / 2968

页数：8

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