Mixed convection boundary-layer flow about an isothermal solid sphere in a nanofluid

L. Tham, Roslinda Mohd. Nazar, I. Pop

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The steady mixed convection boundary-layer flow of a nanofluid about a solid sphere with constant surface temperature has been studied for cases of both assisting and opposing flows. The resulting system of nonlinear partial differential equations is solved numerically using an implicit finite-difference scheme known as the Keller-box method. The solutions for the flow and heat-transfer characteristics are evaluated numerically for various values of the parameters, namely the nanoparticle volume fraction φ and the mixed convection parameter λ at Prandtl numbers Pr=0.7 and 6.2. The three different types of nanoparticles considered are Al2O3, Cu and TiO2, using water-based fluid with Pr=6.2. It is found that for each particular nanoparticle, as the nanoparticle volume fraction φ increases, the skin friction coefficient and the heat-transfer rate at the surface also increase. This leads to an increase in the value of the mixed convection parameter λ, which at first gives no separation.

Original languageEnglish
Article number025403
JournalPhysica Scripta
Volume84
Issue number2
DOIs
Publication statusPublished - Aug 2011

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Nanofluid
Mixed Convection
boundary layer flow
Boundary Layer Flow
Nanoparticles
convection
nanoparticles
Volume Fraction
Heat Transfer
heat transfer
skin friction
Skin Friction
TiO2
Prandtl number
Friction Coefficient
Nonlinear Partial Differential Equations
Finite Difference Scheme
partial differential equations
coefficient of friction
surface temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics

Cite this

Mixed convection boundary-layer flow about an isothermal solid sphere in a nanofluid. / Tham, L.; Mohd. Nazar, Roslinda; Pop, I.

In: Physica Scripta, Vol. 84, No. 2, 025403, 08.2011.

Research output: Contribution to journalArticle

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