ON VISCOELASTIC FLOWS THROUGH ABRUPT CONTRACTIONS

被引：33

作者：

BOGER, DV

CROCHET, MJ

KEILLER, RA

机构：

[1] CATHOLIC UNIV LOUVAIN,UNITE MECAN APPL,2 PL LEVANT,B-1348 LOUVAIN,BELGIUM

[2] UNIV MELBOURNE,DEPT CHEM ENGN,PARKVILLE,VIC 3052,AUSTRALIA

[3] UNIV CAMBRIDGE,DEPT APPL MATH & THEORET PHYS,CAMBRIDGE CB3 9EW,ENGLAND

来源：

JOURNAL OF NON-NEWTONIAN FLUID MECHANICS | 1992年 / 44卷

关键词：

VISCOELASTIC FLOW; ABRUPT CONTRACTION; VORTEX GROWTH; BOGER FLUID; FINITE ELEMENTS; NUMERICAL SIMULATION; EXTENSIONAL VISCOSITY;

D O I：

10.1016/0377-0257(92)80053-Z

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

We show that the quantitative discrepancy between the experimental observation and the theoretical calculation of the vortex growth in viscoelastic flow through abrupt contractions is mainly due to a misunderstanding in the definition of the Weissenberg number. The experimentalists use a relaxation time specified by the shear rate at the wall in the downstream tube while the theoreticians use the low shear rate relaxation time, which is a constant for the fluids used in the experimental programme. We compare two definitions of the Weissenberg number and use them for the analysis of earlier experimental observations and for the theoretical analysis of the flow of a White-Metzner fluid through a 4 : 1 abrupt contraction.

引用

页码：267 / 279

页数：13

共 14 条

[1] A SIMPLE EMPIRICAL-MODEL DESCRIBING THE STEADY-STATE SHEAR AND EXTENSIONAL VISCOSITIES OF POLYMER MELTS [J].