Unsteady heat transfer in an enclosure with a time-periodic rotating cylinder

H. Saleh, Ishak Hashim

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Unsteady mixed convection heat transfer in a differentially heated square enclosure is studied in this article. A conductive circular with rotational speed varying periodically with time is embedded in the center of the enclosure. The governing equations are modeled in the COMSOL, with a partial differential equation (PDE) solver being based on the Galerkin finite element method (GFEM). The governing parameters considered are the rotary amplitude, -1000 ≤ AΩ ≤ 1000, the rotary frequency, 0 ≤ FΩ ≤ 300π, the cylinder radius, 0 ≤ R ≤ 0.2, and the thermal conductivity ratio, 0.5 ≤ Kr ≤ 10. It was found that the recirculating cells exist for a positive rotary amplitude and it increases with the rotational speed. Fast rotation and a high frequency combined with a low thermal conductivity ratio was found to be most effective in enhancing the performance of the overall heat transfer rate.

Original languageEnglish
Pages (from-to)145-161
Number of pages17
JournalHeat Transfer Research
Volume44
Issue number2
DOIs
Publication statusPublished - 2013

Fingerprint

rotating cylinders
Engine cylinders
enclosure
Enclosures
Thermal conductivity
thermal conductivity
heat transfer
Heat transfer
Mixed convection
partial differential equations
Partial differential equations
finite element method
convection
Finite element method
radii
cells

Keywords

  • Conjugate heat transfer
  • Mixed convection
  • Rotating cylinder

ASJC Scopus subject areas

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

Cite this

Unsteady heat transfer in an enclosure with a time-periodic rotating cylinder. / Saleh, H.; Hashim, Ishak.

In: Heat Transfer Research, Vol. 44, No. 2, 2013, p. 145-161.

Research output: Contribution to journalArticle

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