3 dimensional computational fluid dynamic analysis of heat transfer in a scraped surface heat exchanger for bingham fluids

dc.contributor.authorAli, S.en
dc.contributor.authorBaccar, M.en
dc.date.accessioned2017-08-28T07:07:50Z
dc.date.available2017-08-28T07:07:50Z
dc.date.issued2016en
dc.descriptionPapers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.en
dc.description.abstractThis study is focused on numerical analysis of the thermal behavior within a scraped surface heat exchanger (SSHE) for threshold fluids (Bingham fluids). An innovative SSHE is considered which includes helical ribbon, instead of using scrapers. Heat transfer simulations were carried out by means of specific CFD code to solve the three dimensional form of continuity, momentum and energy equations. In this work, the influence of dimensionless numbers (rotational Reynolds, axial Reynolds and Oldroyd numbers) on thermal behavior is studied. Numerical results show that for low axial Reynolds numbers compared to rotational Reynolds number (Reax/Rer <1), there is opposition between the axial components of velocity coming from the flow (ascending components) and axial components at the helical ribbon due to the mixing effect (descending components). However, for high axial Reynolds numbers (Reax/Rer >1), a parabolic-like flow is generated, indicating low degree of back mixing. Numerical results show also that an important heated zone was observed near the blades due to high blades rotating speed. The highest temperatures are found at the thermal boundary layer periodically disturbed by the helical ribbon. It appears that increasing the Oldroyd number produces a slight rise in the temperature field.en
dc.format.extent5 pagesen
dc.format.mediumPDFen
dc.identifier.urihttp://hdl.handle.net/2263/61917
dc.language.isoenen
dc.publisherHEFATen
dc.rightsUniversity of Pretoriaen
dc.subject3D Computational fluid dynamicsen
dc.subjectBingham fluiden
dc.subjectHeat exchangeren
dc.subjectHeat transferen
dc.title3 dimensional computational fluid dynamic analysis of heat transfer in a scraped surface heat exchanger for bingham fluidsen
dc.typePresentationen

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