Heatline visualization of natural convection in a thick walled open cavity filled with a nanofluid

Nadezhda S. Bondareva, Mikhail A. Sheremet, Hakan F. Oztop, Nidal Abu-Hamdeh

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Natural convection of an alumina-water nanofluid in a partially open rectangular cavity with a left heat-conducting solid wall of finite thickness and conductivity has been studied numerically. Governing equations formulated in dimensionless stream function and vorticity variables on the basis of a single-phase nanofluid model with corresponding boundary conditions have been solved by finite difference method. Analysis of the influence of Rayleigh number (Ra = 103–106), thermal conductivity ratio (1 ⩽ K ⩽ 20), solid wall thickness (0.1 ⩽ δ ⩽ 0.3) and nanoparticles volume fraction (0 ⩽ ϕ ⩽ 0.05) on streamlines, heatlines and isotherms as well as average Nusselt number at solid-fluid interface and fluid flow rate has been carried out. It has been revealed that for the considered models for an effective thermal conductivity ratio and dynamic viscosity an increase in the nanoparticles volume fraction leads to the heat transfer reduction and decrease of the fluid flow rate.

Original languageEnglish
Pages (from-to)175-186
Number of pages12
JournalInternational Journal of Heat and Mass Transfer
Volume109
DOIs
Publication statusPublished - 2017

Fingerprint

Natural convection
free convection
Visualization
cavities
fluid flow
Flow of fluids
Volume fraction
Thermal conductivity
thermal conductivity
flow velocity
Flow rate
Nanoparticles
nanoparticles
Aluminum Oxide
Rayleigh number
Nusselt number
Vorticity
Finite difference method
vorticity
Isotherms

Keywords

  • Heat-conducting solid wall
  • Heatlines
  • Nanofluid
  • Natural convection
  • Numerical results
  • Semi-open cavity

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

Heatline visualization of natural convection in a thick walled open cavity filled with a nanofluid. / Bondareva, Nadezhda S.; Sheremet, Mikhail A.; Oztop, Hakan F.; Abu-Hamdeh, Nidal.

In: International Journal of Heat and Mass Transfer, Vol. 109, 2017, p. 175-186.

Research output: Contribution to journalArticle

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AU - Abu-Hamdeh, Nidal

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AB - Natural convection of an alumina-water nanofluid in a partially open rectangular cavity with a left heat-conducting solid wall of finite thickness and conductivity has been studied numerically. Governing equations formulated in dimensionless stream function and vorticity variables on the basis of a single-phase nanofluid model with corresponding boundary conditions have been solved by finite difference method. Analysis of the influence of Rayleigh number (Ra = 103–106), thermal conductivity ratio (1 ⩽ K ⩽ 20), solid wall thickness (0.1 ⩽ δ ⩽ 0.3) and nanoparticles volume fraction (0 ⩽ ϕ ⩽ 0.05) on streamlines, heatlines and isotherms as well as average Nusselt number at solid-fluid interface and fluid flow rate has been carried out. It has been revealed that for the considered models for an effective thermal conductivity ratio and dynamic viscosity an increase in the nanoparticles volume fraction leads to the heat transfer reduction and decrease of the fluid flow rate.

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