Distribution of particles during solvent evaporation from films
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- 作者：Routh ; Alexander F. ; Zimmerman ; William B.
- 关键词：Evaporation ; Films ; Colloidal phenomena ; Drying ; Numerical analysis ; Particles
- 刊名：Chemical Engineering Science
- 出版年：2004
- 出版时间：July, 2004
- 年：2004
- 卷：59
- 期：14
- 页码：2961-2968
- 全文大小：288 K
文摘
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 Pe1/2. This is different from conventional sedimentation, where convection rather than diffusion dominates.