The effect of the expansion ratio on a turbulent non-Newtonian recirculating flow

被引：0

作者：

A. S. Pereira

F. T. Pinho

机构：

[1] Departamento de Engenharia Química Instituto Superior de Engenharia do Porto Rua de São Tomé 4200 Porto,

[2] Portugal,undefined

[3] Centro de Estudos de Fenómenos de Transporte,undefined

[4] DEMEGI,undefined

[5] Faculdade de Engenharia,undefined

[6] Universidade do Porto,undefined

[7] Rua Dr. Roberto Frias,undefined

[8] 4200–465 Porto,undefined

[9] Portugal e-mail: fpinho@fe.up.pt,undefined

来源：

Experiments in Fluids | 2002年 / 32卷

关键词：

Aqueous Solution; Flow Characteristic; Reynolds Stress; Diameter Ratio; Normalise Location;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Measurements of the mean and turbulent flow characteristics of shear-thinning moderately elastic 0.1% and 0.2% xanthan gum aqueous solutions were carried out in a sudden expansion having a diameter ratio of 2. The inlet flow was turbulent and fully developed, and the results were compared with data for water in the same geometry and with previous published Newtonian and non-Newtonian data in a smaller expansion of diameter ratio equal to 1.538. An increase in expansion ratio led to an increase in the recirculation length and in the axial normal Reynolds stress at identical normalised locations, but the difference between Newtonian and non-Newtonian characteristics was less intense than in the smaller expansion. An extensive comparison of mean and turbulent flow characteristics was carried out in order to understand the variation of flow features.

引用

页码：458 / 471

页数：13