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Heat Transfer Research
インパクトファクター: 1.199 5年インパクトファクター: 1.155 SJR: 0.267 SNIP: 0.503 CiteScore™: 1.4

ISSN 印刷: 1064-2285
ISSN オンライン: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2012005450
pages 145-161

UNSTEADY HEAT TRANSFER IN AN ENCLOSURE WITH A TIME-PERIODIC ROTATING CYLINDER

Habibis Saleh
School of Mathematical Sciences, Universiti Kebangsaan Malaysia, 43600 UKM Bangi Selangor, Malaysia
Ishak Hashim
School of Mathematical Sciences & Solar Energy Research Institute, Faculty of Science & Technology, Universiti Kebangsaan Malaysia 43600 UKM Bangi, Selangor DE, Malaysia

要約

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.


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