Heat transfer enhancement using vortex promoters in magneto-hydro-dynamic flows

Oliver G.W. Cassells, Wisam K. Hussam, Gregory J. Sheard

Research output: Chapter in Book/Report/Conference proceedingConference PaperOtherpeer-review

Abstract

The effect of vortex promoter orientation on heat transfer enhancement from a duct side-wall in which an electrically conducting fluid flows under the influence of a transverse magnetic field is investigated. A quasi-two-dimensional magneto-hydrodynamic model is employed to model the flow using high resolution numerical simulation. The gap height and angle of attack of a cylinder with rectangular cross-section (aspect ratio 휶=ퟏ/ퟐ) and blockage ratio 휷=ퟏ/ퟒ, were independently varied to establish relationships between obstacle configuration and heat transfer efficiency. The heat transfer efficiency is measured through an efficiency index defined by the ratio of heat transfer enhancement to pressure drop penalty in comparison to an empty duct case. At gap height ratios ퟏ.ퟏퟓ≤푮/푳풄<ퟐ for an upright cylinder above a heated lower wall, thermal enhancement and efficiency can be improved, with a peak thermal efficiency of 휼=ퟏ.ퟔ occurring at 푮푳풄⁄=ퟏ.ퟓ. For a cylinder offset at 푮푳풄⁄=ퟏ.ퟓ, varying the incidence angle through −ퟑퟕ.ퟓ°<휸≤ퟐퟐ.ퟓ°, −ퟕ.ퟓ°<휸<ퟎ° and ퟎ°<휸≤ퟏퟓ° can lead to additional thermal efficiency benefits, with a global peak efficiency of 휼=ퟏ.ퟕ occurring at 휸= −ퟑퟕ.ퟓ° .
Original languageEnglish
Title of host publicationEleventh International Conference on CFD in the Minerals and Process Industries
EditorsChris B Solnordal, Petar Liovic, Gary W Delaney, Sharen J Cummins, M Phil Schwarz, Peter J Witt
Place of PublicationMelbourne Vic Australia
PublisherCSIRO Publishing
Pages1 - 6
Number of pages6
ISBN (Print)9781486306206
Publication statusPublished - 2015
EventInternational Conference on CFD in the Minerals and Process Industries 2015 - Melbourne Conference and Exhibition Centre, South Wharf, Melbourne, Australia
Duration: 7 Dec 20159 Dec 2015
Conference number: 11th

Conference

ConferenceInternational Conference on CFD in the Minerals and Process Industries 2015
Abbreviated titleCFD 2015
CountryAustralia
CityMelbourne
Period7/12/159/12/15

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