Low Prandtl number convection in a vertical cavity: Effect of aspect ratio and suppression of oscillations by an axial magnetic field
Natural convection of a low Prandtl number liquid, (Pr = 0.015), under the influence of an axial magnetic field inside a differentially-heated rectangular enclosure has been numerically studied. The aspect ratio of the cavity (height/width) is varied from 0.2 to 15 and the Hartmann number is changed from 0 to 100. The degree to which the applied magnetic field suppresses convective motions is extensively studied. In tall cavities, under weak magnetic fields, the flow may become oscillatory and shows random behavior at high Grashof numbers, Gr = 10{sup 6}, used in the present study. This has never been reported before. A sufficiently strong magnetic field suppresses these oscillations. The effect of aspect ratio on the average Nusselt number under various strengths of the magnetic field is graphically illustrated.
- Research Organization:
- State Univ. of New York, Stony Brook, NY (US)
- Sponsoring Organization:
- Defense Advanced Research Project Agency
- OSTI ID:
- 20014357
- Resource Relation:
- Conference: 32nd National Heat Transfer Conference, Baltimore, MD (US), 08/08/1997--08/12/1997; Other Information: PBD: 1997; Related Information: In: ASME proceedings of the 32nd national heat transfer conference (HTD-Vol. 346). Volume 8: Fundamentals of convection; Turbulent heat transfer; Mixed convection heat transfer, by Oosthuizen, P.H.; Chen, T.S.; Acharya, S.; Armaly, B.F.; Pepper, D.W. [eds.], 201 pages.
- Country of Publication:
- United States
- Language:
- English
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