Transient natural convective heat transfer in a trapezoidal cavity filled with non-Newtonian nanofluid with sinusoidal boundary conditions on both sidewalls

A. I. Alsabery, A. J. Chamkha, H. Saleh, Ishak Hashim

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Transient, laminar natural convection in a trapezoidal cavity filled with a non-Newtonian nanofluid with sinusoidal boundary conditions on both sidewalls is studied numerically by using the finite element method. The sloping walls of the cavity are heated by sinusoidal temperature distributions, while the horizontal walls allow no heat transfer to the surrounding. Water-based nanofluids with Ag or Cu or Al2O3 or TiO2 nanoparticles are chosen for investigation. The governing parameters of this study are the Rayleigh number (104 ≤Ra ≤ 106), phase deviation (0 ≤ γ ≤ π), amplitude ratio (0 ≤ ε ≤ 1), power-law index (0.6 ≤ n ≤ 1.4), sidewall inclination angle (0°≤ φ ≤ 21.8°), nanoparticle volume fraction (0 ≤ ϕ ≤ 0.2), and dimensionless time (0 ≤ τ ≤ 0.2). The results show that the heat transfer rate increases significantly by the addition of phase deviation. Strong heat transfer enhancements are obtained by higher sidewall inclination angles. However, for a square cavity, the heat transfer approaches the steady-state condition with the increment of the dimensionless time.

Original languageEnglish
Pages (from-to)214-234
Number of pages21
JournalPowder Technology
Volume308
DOIs
Publication statusPublished - 15 Feb 2017

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Boundary conditions
Heat transfer
Nanoparticles
Natural convection
Volume fraction
Temperature distribution
Finite element method
Water

Keywords

  • Finite element method
  • Non-Newtonian nanofluid
  • Sinusoidal boundary conditions
  • Transient natural convection
  • Trapezoidal cavity

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Transient natural convective heat transfer in a trapezoidal cavity filled with non-Newtonian nanofluid with sinusoidal boundary conditions on both sidewalls. / Alsabery, A. I.; Chamkha, A. J.; Saleh, H.; Hashim, Ishak.

In: Powder Technology, Vol. 308, 15.02.2017, p. 214-234.

Research output: Contribution to journalArticle

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AU - Hashim, Ishak

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