Enhancing natural convection in a cube using a strong magnetic field — Experimental heat transfer rate measurements and flow visualization

Bednarz, Tomasz, Patterson, John C., Lei, Chengwang, & Ozoe, Hiroyuki (2009) Enhancing natural convection in a cube using a strong magnetic field — Experimental heat transfer rate measurements and flow visualization. International Communications in Heat and Mass Transfer, 36(8), pp. 781-786.

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The effect of a strong magnetic field on the average heat transfer rate and flow profiles of joint gravitational and thermo-magnetic convection of a paramagnetic fluid in a cubic enclosure heated from below and cooled from above was experimentally investigated. The working fluid consisted of 80% mass glycerol aqueous solution with a concentration of 0.8 mol/kg gadolinium nitrate hexahydrate making it paramagnetic. The cubic enclosure of 32-mm sides was located in the 10-cm bore of a horizontally oriented 5-Tesla super-conducting magnet at a position where the magnetic force distribution was relatively uniform. Under this configuration, the magnetic field imposed in the horizontal direction acted perpendicularly to gravity. It was found that the heat transfer rate through the cube increased with the increase of the magnetic induction. Furthermore, steady and transient state flow visualizations were carried out with a 10-Tesla super-conducting magnet to show a change in the temperature field when magnet-thermo convection dominated. Visualization was made using thermo-chromic liquid crystal slurry added to the working fluid and illuminated in a vertical cross-section of the cube.

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19 citations in Web of Science®
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ID Code: 99656
Item Type: Journal Article
Refereed: Yes
Keywords: magnetic convection, heat transfer rate, paramagentic fluid, visualisation
DOI: 10.1016/j.icheatmasstransfer.2009.06.005
ISSN: 0735-1933
Divisions: Current > Research Centres > ARC Centre of Excellence for Mathematical & Statistical Frontiers (ACEMS)
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute for Future Environments
Current > Schools > School of Mathematical Sciences
Copyright Owner: 2016 Elsevier B.V.
Deposited On: 04 Oct 2016 22:27
Last Modified: 09 Oct 2016 21:45

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