Mixed convection boundary layer flow from a horizontal circular cylinder in a micropolar fluid

Case of constant wall heat flux

Roslinda Mohd. Nazar, N. Amin, I. Pop

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The laminar mixed convection boundary layer flow of an incompressible micropolar fluid past a horizontal circular cylinder with a constant surface heat flux qw, has been studied in both cases of a heated and cooled cylinder. The transformed conservation equations of the non-similar boundary layers are solved numerically using a very efficient finite-difference method known as the Keller-box scheme. The solutions for the flow and heat transfer characteristics are evaluated numerically for different parameters, such as the mixed convection parameter λ, the material parameter K (vortex viscosity parameter) and the Prandtl number Pr. It is found that heating the cylinder delays separation of the boundary layer and can, if the cylinder is warm enough, suppress it completely. Cooling the cylinder, on the other side, brings the separation point nearer to the lower stagnation point and for sufficiently cold cylinder there will not be a boundary layer on the cylinder.

Original languageEnglish
Pages (from-to)143-159
Number of pages17
JournalInternational Journal of Fluid Mechanics Research
Volume31
Issue number2
DOIs
Publication statusPublished - 2004

Fingerprint

micropolar fluids
Mixed convection
boundary layer flow
Boundary layer flow
circular cylinders
Circular cylinders
Heat flux
heat flux
Boundary layers
convection
Fluids
boundary layers
Prandtl number
Finite difference method
Conservation
Vortex flow
Viscosity
Heat transfer
Cooling
Heating

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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abstract = "The laminar mixed convection boundary layer flow of an incompressible micropolar fluid past a horizontal circular cylinder with a constant surface heat flux qw, has been studied in both cases of a heated and cooled cylinder. The transformed conservation equations of the non-similar boundary layers are solved numerically using a very efficient finite-difference method known as the Keller-box scheme. The solutions for the flow and heat transfer characteristics are evaluated numerically for different parameters, such as the mixed convection parameter λ, the material parameter K (vortex viscosity parameter) and the Prandtl number Pr. It is found that heating the cylinder delays separation of the boundary layer and can, if the cylinder is warm enough, suppress it completely. Cooling the cylinder, on the other side, brings the separation point nearer to the lower stagnation point and for sufficiently cold cylinder there will not be a boundary layer on the cylinder.",
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