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Mixed convection boundary layer flow of a viscoelastic fluid over a horizontal circular cylinder

Anwar, Ilyana and Amin, Norsarahaida and Pop, Ioan (2008) Mixed convection boundary layer flow of a viscoelastic fluid over a horizontal circular cylinder. International Journal of Non-Linear Mechanics, 43 (9). 814 -821. ISSN 0020-7462

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Official URL: http://dx.doi.org/10.1016/j.ijnonlinmec.2008.04.00...

Abstract

The steady mixed convection boundary layer flow of a viscoelastic fluid over a horizontal circular cylinder in a stream flowing vertically upwards is numerically studied for both cases of heated and cooled cylinders. The governing partial differential equations are transformed into dimensionless forms using an appropriate transformation and then solved numerically using the Keller-box method. The comparison between the solutions obtained and those for a Newtonian fluid is found to be very good. Effects of the mixed convection and elasticity parameters on the skin friction and heat transfer coefficients for a fluid having the Prandtl number equal to one are also discussed. It is found that for some values of the viscoelastic parameter and some negative values of the mixed convection parameter (opposing flow) the boundary layer separates from the cylinder. Heating the cylinder delays separation and can, if the cylinder is warm enough, suppress the separation completely. Similar to the case of a Newtonian fluid, cooling the cylinder brings the separation point nearer to the lower stagnation point. However, for a sufficiently cold cylinder there will not be a boundary layer.

Item Type:Article
Uncontrolled Keywords:boundary layer, circular cylinder, mixed convection, numerical method, viscoelastic fluid
Subjects:Q Science > QA Mathematics
Divisions:Science
ID Code:12637
Deposited By: Mrs Liza Porijo
Deposited On:15 Jun 2011 05:16
Last Modified:15 Jun 2011 05:16

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