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Journal of Enhanced Heat Transfer
IF: 0.562 5-Year IF: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Print: 1065-5131
ISSN Online: 1026-5511

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2011000811
pages 481-490

EFFECTS OF ELECTRIC AND MAGNETIC FIELDS ON THERMAL INSTABILITY IN NATURAL CONVECTION FLOW OVER A ROTATING BOUNDARY LAYER

Chin-Tai Chen
Department of Industrial and Engineering Management, Ta-Hwa Institute of Technology, Taiwan

ABSTRACT

Effects of the electric and magnetic fields on the formation of longitudinal vortices in natural convection flow over a rotating heated flat plate are studied. The onset position characterized by the local Grashof number depends on the rotational Reynolds number, Prandtl number, Hartmann number, electrical field parameter, and wave number. The Coriolis force and the Lorentz force have significant effects on the formation of longitudinal vortices and the associated instability. Positive rotation and a positive electrical field parameter stabilize the flow on the rotating flat plate. The flow is found to be more stable as the values of the Hartmann number increase. On the contrary, negative rotation destabilizes the flow. The numerical data show reasonable agreement with the experimental results in the case of thermal instability in natural convection over a flat plate with zero rotation.


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