Time-periodic non-Newtonian power-law flow across a triangular prism

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• 作者：Richa Agarwal ; Amit Dhiman
• 关键词：Triangular prism ; Unsteady flow ; Non ; Newtonian fluids ; Drag coefficient ; Reynolds number ; Power ; law index ; Strouhal number
• 刊名：Journal of the Brazilian Society of Mechanical Sciences and Engineering
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：38
• 期：1
• 页码：227-240
• 全文大小：2,995 KB
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• 作者单位：Richa Agarwal (1)
  Amit Dhiman (1)
  
  1. Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
  
• 刊物主题：Mechanical Engineering;
• 出版者：Springer Berlin Heidelberg
• ISSN：1806-3691

文摘

The effects of non-Newtonian power-law fluids on the unsteady unconfined fluid flow characteristics of an equilateral triangular prism are investigated for Reynolds number (Re) ranging from 50 to 150 and power-law index (n) ranging from 0.4 to 1.8. The flow field around a triangular prism is represented by streamline contours. The output parameters such as root-mean-square values of lift and drag coefficients, time-averaged drag and lift coefficients and Strouhal number are calculated. A time-periodic behavior of the flow is observed for the entire range of control parameters studied. An increment in the time-averaged total drag coefficient is observed with the increase in Re for pseudo-plastic and Newtonian fluids. However, for dilatant fluids, a mixed trend is observed when time-averaged total drag coefficient is varied with n. There is an enhancement in the value of Strouhal number with the increase in Re for dilatant fluids, whereas a mixed trend of Strouhal number with Re is noticed for pseudo-plastic fluids. Keywords Triangular prism Unsteady flow Non-Newtonian fluids Drag coefficient Reynolds number Power-law index Strouhal number