Abstract
Experimental analysis of a strong magnetic field influence on heat transfer by paramagnetic fluid was conducted. A rectangular enclosure, filled with working fluid, was placed inside superconducting magnet’s working section in Rayleigh-Benard configuration and three temperature differences between heated and cooled walls ΔT= 3, 5, 11 [°C] were applied. On the basis of performed measurements heat transfer analysis in the form of Nusselt number, conduction and convection heat fluxes calculations was conducted. Obtained results demonstrated that Nusselt number strongly depends on the temperature difference between thermally active walls as well as on the magnetic induction applied to the system. An application of external high magnetic field from 0 [T] to 10 [T] caused an increase of the heat transfer rate – about 250% for ΔT = 3 [°C] and over 340% for ΔT = 5, 11 and 20 [°C] and can be successfully implemented to heat transfer intensification for paramagnetic fluids.
Highlights
Buoyancy-driven natural convection control in closed system is crucial in many applications, such as: heat exchangers, chemical reactors, space industry or nongravitational state research.All surrounding substances may be divided into three basic types, depending on magnetic properties: ferromagnetic, diamagnetic and paramagnetic
Nusselt number significantly escalates with an increase of magnetic induction
Without magnetic induction applied to the system, Nusselt number values start from 3.46, 2.95, 3.62 and 4.51 for ΔT=3, 5, 11 and 20 [°C] respectively
Summary
Buoyancy-driven natural convection control in closed system is crucial in many applications, such as: heat exchangers, chemical reactors, space industry or nongravitational state research. All surrounding substances may be divided into three basic types, depending on magnetic properties: ferromagnetic, diamagnetic and paramagnetic. While ferromagnetics are strongly attracted towards magnetic field (i.e. iron volume susceptibility = 2·105), paramagnetics are poorly attracted by magnetic field source E. oxygene volume susceptibility = 3·10-8), and diamagnetics are weakly repelled by it (i.e. water volume susceptibility = -9·10-6). To influence a fluid flow with paramagnetic or diamagnetic properties, a high magnetic field gradient should be applied. Depending on mutual configuration of magnetic and gravitational forces, different results could be achieved. In present paper authors will focus on heat transfer enhancement with utilization of thermo-magnetic convection of paramagnetic fluid
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