Mixed convection flow over a horizontal circular cylinder with constant heat flux embedded in a porous medium filled by a nanofluid: Buongiorno–Darcy model

Leony Tham, Roslinda Mohd. Nazar, Ioan Pop

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The steady laminar mixed convection boundary layer flow from a horizontal circular cylinder in a nanofluid embedded in a porous medium, which is maintained at a constant surface heat flux, has been studied by using the Buongiorno–Darcy nanofluid model for both cases of a heated and cooled cylinder. 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 and studied for various values of the governing parameters, namely the Lewis number, Brownian number, mixed convection parameter, buoyancy ratio parameter and thermophoresis parameter. It is also found that the boundary layer separation occurs at the opposing fluid flow, that is when the mixed convection parameter is negative. It is also observed that increasing the mixed convection parameter delays the boundary layer separation and the separation can be completely suppressed for sufficiently large values of the mixed convection parameter. The Brownian and buoyancy ratio parameters appear to affect the fluid flow and heat transfer profiles.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalHeat and Mass Transfer/Waerme- und Stoffuebertragung
DOIs
Publication statusAccepted/In press - 18 Nov 2015

Fingerprint

Mixed convection
circular cylinders
Circular cylinders
Porous materials
Heat flux
heat flux
convection
Buoyancy
Flow of fluids
Boundary layers
boundary layer separation
Thermophoresis
Heat transfer
buoyancy
Boundary layer flow
fluid flow
heat transfer
Partial differential equations
thermophoresis
Lewis numbers

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Fluid Flow and Transfer Processes

Cite this

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