Open AccessIntensification of heat transfer with an application of strong magnetic gradients
Author(s) -
Anna Kraszewska,
L. Pyrda,
Janusz Donizak
Publication year - 2016
Publication title -
e3s web of conferences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.203
H-Index - 22
eISSN - 2555-0403
pISSN - 2267-1242
DOI - 10.1051/e3sconf/20161000122
Subject(s) - nusselt number , heat transfer , enclosure , paramagnetism , thermal conduction , convective heat transfer , materials science , film temperature , thermodynamics , convection , magnetic field , condensed matter physics , mechanics , physics , electrical engineering , reynolds number , turbulence , quantum mechanics , engineering
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-Bénard 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