Natural convection heat transfer in a nanofluid-filled trapezoidal enclosure

H. Saleh, R. Roslan, Ishak Hashim

Research output: Contribution to journalArticle

126 Citations (Scopus)

Abstract

Heat transfer enhancement utilizing nanofluids in a trapezoidal enclosure is investigated for various pertinent parameters. Transport equations are modelled by a stream-vorticity formulation and solved numerically by finite difference approach. The inclined sloping boundaries is treated by adopting staircase-like zigzag lines. Based upon the numerical predictions, the effects of Grashof number, inclination angle of the sloping wall, volume fraction of nanoparticles on flow and temperature patterns as well as the heat transfer rate within the enclosure are presented. Water-Cu and water-Al2O 3 nanofluids were tested. We found that acute sloping wall and Cu nanoparticles with high concentration are effective to enhance the rate of heat transfer. We also developed a new correlation for the average Nusselt number as a function of the angle of the sloping wall, effective thermal conductivity and viscosity as well as Grashof number.

Original languageEnglish
Pages (from-to)194-201
Number of pages8
JournalInternational Journal of Heat and Mass Transfer
Volume54
Issue number1-3
DOIs
Publication statusPublished - 15 Jan 2011

Fingerprint

enclosure
Enclosures
Natural convection
free convection
Grashof number
heat transfer
Heat transfer
Nanoparticles
nanoparticles
Water
stairways
Nusselt number
Vorticity
vorticity
water
inclination
Volume fraction
Thermal conductivity
flow distribution
thermal conductivity

Keywords

  • Nanofluids
  • Natural convection
  • Trapezoidal enclosure

ASJC Scopus subject areas

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

Cite this

Natural convection heat transfer in a nanofluid-filled trapezoidal enclosure. / Saleh, H.; Roslan, R.; Hashim, Ishak.

In: International Journal of Heat and Mass Transfer, Vol. 54, No. 1-3, 15.01.2011, p. 194-201.

Research output: Contribution to journalArticle

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