Modelling of the pressure distribution within a hydrodynamic pressure unit: Effect of the change in viscosity during drawing of wire coating

被引：14

作者：

Akter, S ^{[1
]}

Hashmi, MSJ ^{[1
]}

机构：

[1] Dublin City Univ, Sch Mech & Mfg Engn, Dublin 9, Ireland

来源：

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 1998年 / 77卷 / 1-3期

关键词：

pressure distribution; hydrodynamic pressure unit; wire coating;

D O I：

10.1016/S0924-0136(97)00389-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In relation to plasto-hydrodynamic die-less wire drawing and coating, a number of theoretical models for pressure distribution have been presented in previous publications. The pressure medium was a non-Newtonian fluid (polymer melt). However, in each model the viscosity of the polymer was considered to remain unchanged during drawing, but change in the viscosity takes place due to variations in temperature and pressure within the unit. In this paper, a mathematical model has been developed for the pressure distribution within a stepped parallel bore unit, taking account of the changes in the viscosity of the polymer melt during the coating process. Theoretical results are obtained for different wire speeds and geometrical parameters of the pressure unit in terms of the changes in viscosity and pressure distributions within the unit. The results are compared with those predicted according to the models presented in earlier publications. (C) 1998 Elsevier Science S.A. All rights reserved.

引用

页码：32 / 36

页数：5