Mixed convection boundary layer on a solid sphere with constant surface heat flux

Nor Azizah M. Yacob, and Roslinda Mohd Nazar , (2006) Mixed convection boundary layer on a solid sphere with constant surface heat flux. Journal of Quality Measurement and Analysis, 2 (1). pp. 63-74. ISSN 1823-5670

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The steady mixed convection boundary layer flow of an incompressible viscous fluid on a solid sphere with a constant surface heat flux qw is considered for both the assisting and the opposing flow cases. The transformed governing equations of the non-similar boundary layers are solved numerically using the Keller-box method. Numerical results are presented for different values of the mixed convection parameter λ and for the Prandtl number, Pr = 0.7 (air) and Pr = 7 (water). The numerical results obtained include local skin friction coefficient Cf, local wall temperature distribution θw (x) , velocity and temperature profiles. It is found that the assisting flow (λ > 0) delays the separation of the boundary layers, and if the assisting flow is strong enough, it suppresses the separation completely. On the other hand, the opposing flow (λ < 0) brings the separation point nearer to the lower stagnation point ( x ≈ 0 ) of the sphere, and for sufficiently strong opposing flows, there will not be a boundary layer on the sphere

Item Type:Article
Keywords:mixed convection; boundary layer; solid sphere; constant heat flux
Journal:Journal of Quality Measurement and Analysis
ID Code:1821
Deposited By: Ms. Nor Ilya Othman
Deposited On:14 Jun 2011 07:21
Last Modified:21 Jun 2011 07:10

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