Effect of blockage on heat transfer from a cylinder to power law liquids

Bharti, Ram Prakash ; Chhabra, R. P. ; Eswaran, V. (2007) Effect of blockage on heat transfer from a cylinder to power law liquids Chemical Engineering Science, 62 (17). pp. 4729-4741. ISSN 0009-2509

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.ces.2007.06.002


The influence of planar confining walls on the steady forced convection heat transfer from a cylinder to power-law fluids has been investigated numerically by solving the field equations using FLUENT (version 6.2). Extensive results highlighting the effects of the Reynolds number (1≤Re≤40), power-law index (0.2≤n≤1.8), Prandtl number (1≤Pr≤100) and the blockage ratio (β=4 and 1.6) on the average Nusselt number have been presented. For a fixed value of the blockage ratio, the heat transfer is enhanced with the increasing degree of shear-thinning behaviour of the fluid, while an opposite trend was observed in shear-thickening fluids. Due to the modifications of the flow and temperature fields close to the cylinder, the closely placed walls (i.e., decreasing value of the blockage ratio) further enhance the rate of heat transfer as the fluid behaviour changes from Newtonian to shear-thickening fluids (n>1), the opposite influence is seen with the decreasing value of the flow behaviour index (n) in shear-thinning (n<1) fluids. Finally, the functional dependence of the present numerical results on the relevant dimensionless parameters has been presented in the form of closure relationships for their easy use in a new application.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Power-law Fluids; Circular Cylinder; Nusselt Number; Reynolds Number; Prandtl Number; Wall Effects
ID Code:78501
Deposited On:20 Jan 2012 04:30
Last Modified:20 Jan 2012 04:30

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