Mixed convection boundary layer flow about an isothermal sphere in a micropolar fluid

Roslinda Mohd. Nazar, Norsarahaida Amin, Ioan Pop

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The steady mixed convection boundary layer flow of a micropolar fluid about a sphere with a constant surface temperature is considered for both the assisting and opposing flow cases. 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. Numerical results are presented for different values of the material and mixed convection parameters K and λ, respectively, and with the Prandtl number Pr = 0.7 and 7. It is found that assisting flow (λ > 0) delays separation of the boundary layer and can, if the assisting flow is strong enough, suppress it completely. The opposing flow (λ < 0), on the other hand, brings the separation point nearer to the lower stagnation point of the sphere and for sufficiently strong opposing flows there will not be a boundary layer on the sphere. Some results were given in the form of tables. Such tables are very important and they can serve as a reference against which other exact or approximate solutions can be compared in the future.

Original languageEnglish
Pages (from-to)283-293
Number of pages11
JournalInternational Journal of Thermal Sciences
Volume42
Issue number3
DOIs
Publication statusPublished - 1 Mar 2003
Externally publishedYes

Fingerprint

micropolar fluids
Mixed convection
boundary layer flow
Boundary layer flow
Boundary layers
convection
Fluids
boundary layers
Prandtl number
Finite difference method
Conservation
stagnation point
conservation equations
surface temperature
boxes
Temperature

Keywords

  • Boundary layer
  • Isothermal sphere
  • Micropolar fluid
  • Mixed convection
  • Numerical results

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering

Cite this

Mixed convection boundary layer flow about an isothermal sphere in a micropolar fluid. / Mohd. Nazar, Roslinda; Amin, Norsarahaida; Pop, Ioan.

In: International Journal of Thermal Sciences, Vol. 42, No. 3, 01.03.2003, p. 283-293.

Research output: Contribution to journalArticle

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N2 - The steady mixed convection boundary layer flow of a micropolar fluid about a sphere with a constant surface temperature is considered for both the assisting and opposing flow cases. 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. Numerical results are presented for different values of the material and mixed convection parameters K and λ, respectively, and with the Prandtl number Pr = 0.7 and 7. It is found that assisting flow (λ > 0) delays separation of the boundary layer and can, if the assisting flow is strong enough, suppress it completely. The opposing flow (λ < 0), on the other hand, brings the separation point nearer to the lower stagnation point of the sphere and for sufficiently strong opposing flows there will not be a boundary layer on the sphere. Some results were given in the form of tables. Such tables are very important and they can serve as a reference against which other exact or approximate solutions can be compared in the future.

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