Stagnation heat transfer on a concave surface cooled by unconfined slot jet

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dc.contributor.authorAziz, Maurel Nguepnang
dc.date.accessioned2021-10-11T09:13:56Z
dc.date.available2021-10-11T09:13:56Z
dc.date.issued2015
dc.descriptionA dissertation submitted to the faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science in Engineering.en_ZA
dc.description.abstractHeat transfer at the stagnation point on a concave surface and on a flat plate subjected to un-confined slot jet impingement is characterized and compared at a fixed jet Reynolds number of ReB = 20000. The concave surface diameter-to-slot width ratio is fixed at 9.0 whilst the slot exit-to-target surface distance, H/B, varies from 0.5 to 20.0. In particular, the non-monotonic variation of heat transfer at the stagnation point with H/B is fluidically explained. The present results clarify that the deflection zone formed on the target surface as a result of the jet impingement leads to the upstream shift of the peak in turbulence strength that exactly coincides with the peak of heat transfer at the stagnation point. With the concave surface, the impinging jet deflected radially on the surface is re-entrained into the incoming jet due to the curvature, which causes the shortening of the potential core of the slot jet and the longitudinal upstream shift of the peak in turbulence strength compared to the flat plate. Therefore, the peak in heat transfer at the stagnation point occurs at shorter H/B on the concave surface than on the flat plate.en_ZA
dc.description.librarianPH(2021)en_ZA
dc.facultyEngineering and the Built Environmenten_ZA
dc.format.extentOnline resource (43 leaves)
dc.identifier.citationAziz, Maurel Nguepnang. 2015. Stagnation heat transfer on a concave surface cooled by unconfined slot jet. University of the Witwatersrand, https://hdl.handle.net/10539/31662
dc.identifier.urihttps://hdl.handle.net/10539/31662
dc.language.isoenen_ZA
dc.subject.lcshHeat--Transmission
dc.subject.lcshHeat--Conduction
dc.titleStagnation heat transfer on a concave surface cooled by unconfined slot jeten_ZA
dc.typeThesisen_ZA
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