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Effect of MHD and heat generation on natural convection flow in an open square cavity under microgravity condition

By Suvash C. Saha

Abstract

Purpose - Thermo-magnetic convection and heat transfer of paramagnetic fluid placed in a micro-gravity condition (g = 0) and under a uniform vertical gradient magnetic field in an open square cavity with three cold sidewalls have been studied numerically. Design/methodology/approach - This magnetic force is proportional to the magnetic susceptibility and the gradient of the square of the magnetic induction. The magnetic susceptibility is inversely proportional to the absolute temperature based on Curie’s law. Thermal convection of a paramagnetic fluid can therefore take place even in zero-gravity environment as a direct consequence of temperature differences occurring within the fluid due to a constant internal heat generation placed within a magnetic field gradient. Findings - Effects of magnetic Rayleigh number, Ra, Prandtl number, Pr, and paramagnetic fluid parameter, m, on the flow pattern and isotherms as well as on the heat absorption are presented graphically. It is found that the heat transfer rate is suppressed in increased of the magnetic Rayleigh number and the paramagnetic fluid parameter for the present investigation. Originality/value - It is possible to control the buoyancy force by using the super conducting magnet. To the best knowledge of the author no literature related to magnetic convection for this configuration is available

Topics: 010300 NUMERICAL AND COMPUTATIONAL MATHEMATICS, 091307 Numerical Modelling and Mechanical Characterisation, Heat generation, MHD flow, Paramagnetic fluid, Thermo-magnetic convection, Microgravity
Publisher: Emerald Group Publishing
Year: 2013
DOI identifier: 10.1108/02644401311285982
OAI identifier: oai:eprints.qut.edu.au:48276

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