Heat transfer direction dependence of heat transfer coefficients in annuli

dc.contributor.authorPrinsloo, F.P.A. (Francois)
dc.contributor.authorDirker, Jaco
dc.contributor.authorMeyer, Josua P.
dc.contributor.emailjaco.dirker@up.ac.zaen_ZA
dc.date.accessioned2018-02-15T07:34:38Z
dc.date.issued2018-04
dc.description.abstractIn this experimental study the heat transfer phenomena in concentric annuli in tube-in-tube heat exchangers at different annular Reynolds numbers, annular diameter ratios, and inlet fluid temperatures using water were considered. Turbulent flow with Reynolds numbers ranging from 15,000 to 45,000, based on the average bulk fluid temperature was tested at annular diameter ratios of 0.327, 0.386, 0.409 and 0.483 with hydraulic diameters of 17.00, 22.98, 20.20 and 26.18 mm respectively. Both heated and cooled annuli were investigated by conducting tests at a range of inlet temperatures between 10 °C to 30 °C for heating cases, and 30 °C to 50 °C for cooling cases. Of special interest was the direct measurement of local wall temperatures on the heat transfer surface, which is often difficult to obtain and evasive in data-sets. Continuous verification and re-evaluation of temperatures measurements were performed via in-situ calibration. It is shown that inlet fluid temperature and the heat transfer direction play significant roles on the magnitude of the heat transfer coefficient. A new adjusted Colburn j-factor definition is presented to describe the heating and cooling cases and is used to correlate the 894 test cases considered in this study.en_ZA
dc.description.departmentMechanical and Aeronautical Engineeringen_ZA
dc.description.embargo2019-04-01
dc.description.librarianhj2018en_ZA
dc.description.sponsorshipThe National Research Foundation of South Africa (NRF), Eskom Tertiary Education Support Programme (TESP), University of Stellenbosch / University of Pretoria, South African National Energy Research Institute (SANERI) / South African National Energy Development Institute (SANEDI), Council for Scientific and Industrial Research (CSIR), Energy Efficiency and Demand Side Management (EEDSM) Hub and NAC.en_ZA
dc.description.urihttp://link.springer.com/journal/231en_ZA
dc.identifier.citationPrinsloo, F.P.A., Dirker, J. & Meyer, J.P. Heat transfer direction dependence of heat transfer coefficients in annuli. Heat Mass Transfer (2018) 54: 1145-1161. https://doi.org/10.1007/s00231-017-2212-3.en_ZA
dc.identifier.issn0947-7411 (print)
dc.identifier.issn1432-1181 (online)
dc.identifier.other10.1007/s00231-017-2212-3
dc.identifier.urihttp://hdl.handle.net/2263/63974
dc.language.isoenen_ZA
dc.publisherSpringeren_ZA
dc.rights© Springer-Verlag GmbH Germany 2017.The original publication is available at : http://link.springer.comjournal/231.en_ZA
dc.subjectHeat exchangersen_ZA
dc.subjectHeat transferen_ZA
dc.subjectHeat transfer coefficientsen_ZA
dc.subjectReynolds numberen_ZA
dc.subjectDirection dependenceen_ZA
dc.subjectFluid temperaturesen_ZA
dc.subjectHeat transfer surfacesen_ZA
dc.subjectTube-in-tube heat exchangeren_ZA
dc.subjectTransfer phenomenonen_ZA
dc.subjectHydraulic diameterIn-situ calibrationen_ZA
dc.subjectHeating and coolingen_ZA
dc.subject.otherEngineering, built environment and information technology articles SDG-07
dc.subject.otherSDG-07: Affordable and clean energy
dc.subject.otherEngineering, built environment and information technology articles SDG-09
dc.subject.otherSDG-09: Industry, innovation and infrastructure
dc.subject.otherEngineering, built environment and information technology articles SDG-12
dc.subject.otherSDG-12: Responsible consumption and production
dc.titleHeat transfer direction dependence of heat transfer coefficients in annulien_ZA
dc.typePostprint Articleen_ZA

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