Gas displacing viscous shear thinning liquids from tubes: Effects of cooling before gas injection
- 作者：F. Belblidia ; J.F.T. Pittman ; A. Polynkin and J. Sienz
- 关键词：Heat transfer ; Non-Newtonian fluids ; Numerical analysis ; Polymer processing ; Gas assisted moulding
- 刊名：Chemical Engineering Science
- 出版年：2005
- 期刊代码：18_00092509
- 类别：ce
- 出版时间：2005
- 卷：60
- 期：17
- 页码：4953-4956
- 文件大小：222 K
摘要
The thickness of the layer left behind when gas displaces a temperature-dependent power law liquid from a tube, after a period of static cooling of the liquid to the tube wall, is evaluated in finite element simulations. On the basis of some 300 numerical simulations, the dimensionless layer thickness is correlated with dimensionless cooling time, Pearson number, Biot number and power law index in convenient formulae which will be of value in estimating the effects of a gas delay in gas assisted injection moulding.