Numerical study of transient instabilities in reverse-roller coating flows

被引：143
|
作者：
Chandio, MS [1 ]
Webster, MF [1 ]
机构：
[1] Univ Coll Swansea, Dept Comp Sci, Inst Non Newtonian Fluid Mech, Swansea, W Glam, Wales
来源：
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW | 2002年 / 12卷 / 04期
关键词：
numerical simulation; finite elements; free form surfaces;
D O I：
10.1108/09615530210433314
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A semi-implicit Taylor-Galerkin/pressure-correction algorithm of a transient finite element form is applied to analyse the flow instabilities that commonly arise during reverse-roller coating A mathematical model is derived to describe the solvent coating applied to the underside of the sheet, assuming that the lacquer is a Newtonian fluid and considering the flow between application roller and foil. Here, we have investigated the effects of temporal instabilities, caused by adjustment of nip-gap width and foil-position, extending our previous steady-state analysis. Foil shifting is found to have a significant influence upon pressure and lift on the foil, drag on the roller, and free coating profiles. This would result in process instabilities, such as chatter and flow-lines. In contrast, nip-gap adjustment has no influence on the coating finish.
引用
收藏
页码：375 / 403
页数：29
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