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

Case of constant wall temperature

Roslinda Mohd. Nazar, Norsarahaida Amin, Ioan Pop

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

The laminar mixed convection boundary-layer flow of a micropolar fluid past a horizontal circular cylinder in a stream flowing vertically upwards has been studied in both cases of a heated and cooled cylinder. 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 = 1 and 6.8, respectively. It is found, as for the case o fa Newtonian fluid considered for Pr = 1, that heating the cylinder delays separation 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. This model problem may solve industrial problems with processing of polymeric liquids, lubricants and molten plastics.

Original languageEnglish
Pages (from-to)86-109
Number of pages24
JournalInternational Journal of Numerical Methods for Heat and Fluid Flow
Volume13
Issue number1
DOIs
Publication statusPublished - 2003
Externally publishedYes

Fingerprint

Micropolar Fluid
Mixed Convection
Mixed convection
Boundary layer flow
Boundary Layer Flow
Circular Cylinder
Circular cylinders
Horizontal
Fluids
Prandtl number
Lubricants
Molten materials
Boundary layers
Vortex flow
Viscosity
Plastics
Heat transfer
Cooling
Heating
Temperature

Keywords

  • Boundary layers
  • Cylinders
  • Mixed convection

ASJC Scopus subject areas

  • Mechanics of Materials
  • Computational Mechanics
  • Applied Mathematics

Cite this

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