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Journal of Enhanced Heat Transfer
Fator do impacto: 0.562 FI de cinco anos: 0.605 SJR: 0.211 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimir: 1065-5131
ISSN On-line: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v12.i3.40
pages 259-272

Study of Thermal Instability in Natural Convection Flow over a Rotating Convex Surface

Ming-Han Lin
Department of Mechatronic Engineering, Ta-Hwa Institute of Technology, Hsinchu 307, Taiwan, ROC
Chin-Tai Chen
Department of Industrial and Engineering Management, Ta-Hwa Institute of Technology, Taiwan

RESUMO

This paper presents a numerical study of thermal instability in natural convection flow over a convex surface with rotation. The onset position characterized by the Grashof number Grδr depends on the rotational Reynolds number, the Prandtl number, and the wave number. The buoyancy force, centrifugal force, and Coriolis force are found to significantly affect the flow structure and heat transfer. Positive rotation destabilizes the flow over a rotating convex surface. However, negative rotation stabilizes the flow. The numerical results show reasonable agreement with the experimental results in the case of zero rotation.


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