The effect of thermal radiation on the natural convection boundary layer flow over a wavy horizontal surface

Siddiqa, Sadia, Hossain, M.A., & Saha, Suvash (2014) The effect of thermal radiation on the natural convection boundary layer flow over a wavy horizontal surface. International Journal of Thermal Sciences, 84, pp. 143-150.

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In this article, natural convection boundary layer flow is investigated over a semi-infinite horizontal wavy surface. Such an irregular (wavy) surface is used to exchange heat with an external radiating fluid which obeys Rosseland diffusion approximation. The boundary layer equations are cast into dimensionless form by introducing appropriate scaling. Primitive variable formulations (PVF) and stream function formulations (SFF) are independently used to transform the boundary layer equations into convenient form. The equations obtained from the former formulations are integrated numerically via implicit finite difference iterative scheme whereas equations obtained from lateral formulations are simulated through Keller-box scheme. To validate the results, solutions produced by above two methods are compared graphically. The main parameters: thermal radiation parameter and amplitude of the wavy surface are discussed categorically in terms of shear stress and rate of heat transfer. It is found that wavy surface increases heat transfer rate compared to the smooth wall. Thus optimum heat transfer is accomplished when irregular surface is considered. It is also established that high amplitude of the wavy surface in the boundary layer leads to separation of fluid from the plate.

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8 citations in Web of Science®

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ID Code: 88739
Item Type: Journal Article
Refereed: Yes
Keywords: Horizontal wavy surface; Rosseland diffusion approximation; Thermal radiation; Boundary layer
DOI: 10.1016/j.ijthermalsci.2014.05.006
ISSN: 1290-0729
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Elsevier Masson SAS
Deposited On: 29 Oct 2015 23:55
Last Modified: 29 Oct 2015 23:55

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