Unconfined Unsteady Laminar Flow of a Power-Law Fluid across a Square CylinderReportar como inadecuado


Unconfined Unsteady Laminar Flow of a Power-Law Fluid across a Square Cylinder


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School of Engineering, Democritus University of Thrace, 67100 Xanthi, Greece





Academic Editors: Hamid Arastoopour and Mehrdad Massoudi

Abstract The flow of a non-Newtonian, power-law fluid, directed normally to a horizontal cylinder with square cross-section two-dimensional flow is considered in the present paper. The problem is investigated numerically with a very large calculation domain in order that the flow could be considered unconfined. The investigation covers the power-law index from 0.1 up to 2 and the Reynolds number ranges from 60 to 160. Over this range of Reynolds numbers the flow is unsteady. It is found that the drag coefficient and the Strouhal number are higher in a confined flow compared to those of an unconfined flow. In addition some flow characteristics are lost in a confined flow. Complete results for the drag coefficient and Strouhal number in the entire shear-thinning and shear-thickening region have been produced. In shear-thinning fluids chaotic structures exist which diminish at higher values of power-law index. This study represents the first investigation of unsteady, non-Newtonian power-law flow past a square cylinder in an unconfined field. View Full-Text

Keywords: square cylinder; power-law; drag; lift; vortex street square cylinder; power-law; drag; lift; vortex street





Autor: Asterios Pantokratoras

Fuente: http://mdpi.com/



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