Experimental and numerical analysis of thermo-magnetic convection in a vertical annular enclosure

• Published in: International journal of heat and fluid flow Vol. 31; no. 6; pp. 1019 - 1031
• Main Authors: Wrobel, W., Fornalik-Wajs, E., Szmyd, J.S.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY Elsevier Inc 01.12.2010; Elsevier
• Subjects: Annular; Computational fluid dynamics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Convection; Convection and heat transfer; Diamagnetism, paramagnetism and superparamagnetism; Enclosure; Exact sciences and technology; Experimental and numerical analysis; Fluid dynamics; Fluid flow; Fluids; Fundamental areas of phenomenology (including applications); Laminar flows; Laminar flows in cavities; Magnetic properties and materials; Mathematical analysis; Natural convection; Numerical analysis; Nusselt number; Physics; Thermo-magnetic convection; Thermo-magnetic Rayleigh number; Turbulent flows, convection, and heat transfer; Vertical annular enclosure; Thermo-magnetic Rayleigh number; Experimental and numerical analysis; Natural convection; Nusselt number; Thermo-magnetic convection; Vertical annular enclosure; Vertical cylinder; Thermomagnetic effects; Annular space; Digital simulation; Magnetic field effects; Experimental study; Cavity flow; Paramagnetic properties; Coaxial cylinders; Heat transfer
• ISSN: 0142-727X; 1879-2278
• DOI: 10.1016/j.ijheatfluidflow.2010.05.012

In the present paper an experimental and numerical analysis of a thermo-magnetic convective flow of paramagnetic fluid in an annular enclosure with a round rod core and a cylindrical outer wall is presented. It is complemented by an experimental analysis of natural convection depending on the inclination angle to show the stability of the present configuration. Convection in an annulus between two vertical co-axial cylinders resulting from gravitational and magnetic environments has been investigated. A strong magnetic field can be an alternative to heat transfer enhancement. The effect of the magnetic field on the convection of the paramagnetic fluid in the annular vessel in various positions was compared. The numerical analysis was done based on the continuity, momentum and energy equations. A term related to the magnetic buoyancy force was added to the momentum equation. The distributions of Nusselt number present minima in two positions of the enclosure, which depends on the reciprocal relationship between the gravitational and magnetising forces.