Numerical study of transient instabilities in reverse-roller coating flows

被引：145

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

页码：375 / 403

页数：29

共 21 条

[1]

BENJAMIN DF, THESIS U MINNESOTA M

[2] A TAYLOR-PETROV-GALERKIN ALGORITHM FOR VISCOELASTIC FLOW [J].

CAREW, EOA ;

TOWNSEND, P ;

WEBSTER, MF .

JOURNAL OF NON-NEWTONIAN FLUID MECHANICS, 1993, 50 (2-3) :253-287

[3] Deformable roll coating flows: Steady state and linear perturbation analysis [J].

Carvalho, MS ;

Scriven, LE .

JOURNAL OF FLUID MECHANICS, 1997, 339 :143-172

[4]

Carvalho MS, 1997, INT J NUMER METH FL, V24, P813, DOI 10.1002/(SICI)1097-0363(19970515)24:9<813::AID-FLD519>3.0.CO

[5]

2-T

[6]

CHANDIO MS, UNPUB INT J NUM METH

[7]

CHEN KSA, 1988, AICHE SPRING NAT M N

[8] Forward roll coating of Newtonian fluids with deformable rolls: An experimental investigation [J].

Cohu, O ;

Magnin, A .

CHEMICAL ENGINEERING SCIENCE, 1997, 52 (08) :1339-1347

[9]

Cuvelier C, 1986, FINITE ELEMENT METHO

[10] Finite element analysis of fluid-solid interaction in the metering nip of a metering size press [J].

Fourcade, E ;

Bertrand, F ;

Réglat, O ;

Tanguy, PA .

COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING, 1999, 174 (1-2) :235-245

← 1 2 3 →