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ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561
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UNSTEADY HEAT TRANSFER IN AN ENCLOSURE WITH A TIME-PERIODIC ROTATING CYLINDER
ABSTRAKT
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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Yang Hui, Zhang Wei, Zhu Zuchao, Unsteady mixed convection in a square enclosure with an inner cylinder rotating in a bi-directional and time-periodic mode, International Journal of Heat and Mass Transfer, 136, 2019. Crossref
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Lee Shong-Leih, Chiou Jeng-Bin, Cyue Guo-Sian, Mixed convection in a square enclosure with a rotating flat plate, International Journal of Heat and Mass Transfer, 131, 2019. Crossref