On the similarity between gravity and magneto-gravity convection within a non-electroconducting fluid in a differentially heated rectangular cavity

• Published in: International journal of heat and mass transfer 2005-03, Vol.48 (7), p.1350-1360
• Main Authors: Khaldi, F., Noudem, J., Gillon, P.
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Convection and heat transfer; Diamagnetism and paramagnetism; Diamagnetism, paramagnetism and superparamagnetism; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Magnetic properties and materials; Physics; Turbulent flows, convection, and heat transfer
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/j.ijheatmasstransfer.2004.10.007

The magneto-gravity convection induced by a vertical magnetic field gradient applied to a non-electroconducting paramagnetic liquid in a differentially heated rectangular cavity is investigated numerically and experimentally. Due to the magnetic susceptibility temperature dependence of the fluid, the magnetic body force drives a thermoconvective motion in the cavity. Depending on the sign of the magnetic gradient, the vertical magnetic force in the liquid can be parallel or antiparallel to gravity. Hence, buoyancy convection in the cavity results of the combination of the vertical magnetic force and of gravity. Expressed in terms of Nu versus Ra, the experimental and numerical results are compared to the correlation obtained by Catton without magnetic field. Agreement between the two curves clearly points out the similarity between gravity induced convection and magneto-gravity convection.