Effect of the angle of incidence on laminar forced convection from an elliptical cylinder in Bingham plastic fluids

Document Type

Article

Publication Date

10-17-2016

Abstract

The effect of the angle of attack on an elliptical cylinder in the steady forced convection regime of Bingham plastic fluids is investigated numerically. The elliptical cylinder with an aspect ratio (≡a/b), E = 0.5 is subjected to either the constant wall temperature (CWT) or the constant heat flux (CHF) conditions. The parameters influencing the flow and heat transfer in Bingham plastic fluids are the Reynolds number (0.01 ≤ Re ≤ 30), the Prandtl number (1 ≤ Pr ≤ 100), the Bingham number (0.01 ≤ Bn ≤ 100), and the angle of inclination (0° ≤ λ ≤ 90°). The detailed structure of the flow and the heat transfer characteristics have been analyzed in terms of the distributions of pressure coefficient, vorticity, and the local Nusselt number on the surface of the cylinder; in addition, the flow domain is mapped in terms of the streamline and isotherms in the vicinity of the heated cylinder. In all cases, the orientation of the elliptical cylinder plays an important role in the onset of the asymmetry in the flow and the morphology of the yielded/unyielded regions under the combined effects of the yield stress and inertial forces. Finally, the present numerical values of the drag coefficient and average Nusselt number have been correlated in terms of the pertinent dimensionless parameters with acceptable levels of accuracy over the range of inclinations considered in the present study. The dependence of the Nusselt number on the angle of inclination is found to be nonmonotonous.

Identifier

84988383412 (Scopus)

Publication Title

Numerical Heat Transfer Part A Applications

External Full Text Location

https://doi.org/10.1080/10407782.2016.1214493

e-ISSN

15210634

ISSN

10407782

First Page

917

Last Page

937

Issue

8

Volume

70

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