Single-phase convective heat transfer and pressure drop coefficients in smooth concentric annuli

dc.contributor.authorVan Zyl, W.R. (Warren Reece)
dc.contributor.upauthorDirker, Jaco
dc.contributor.upauthorMeyer, Josua P.
dc.date.accessioned2014-12-09T11:45:51Z
dc.date.available2014-12-09T11:45:51Z
dc.date.issued2012
dc.description.abstractPaper presented at the 9th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Malta, 16-18 July, 2012.en_US
dc.description.abstractVarying diameter ratios associated with smooth concentric tube-in-tube heat exchangers are known to have an effect on its convective heat transfer capabilities. Linear and nonlinear regression models exist for determining the heat transfer coefficients; however these are complex and time consuming, and require much experimental data in order to obtain accurate solutions. A large dataset of experimental measurements on heat exchangers with annular diameter ratios of 0.483, 0.579, 0.593 and 0.712 was gathered. Using the modified Wilson plot technique, a nonlinear regression scheme, and the log mean temperature difference method, both local and average Nusselt numbers were determined. Local wall temperature measurements were made using a novel method. Friction factors were calculated directly from measured pressure drops across the annulus. Both heated and cooled horizontal annuli with Reynolds numbers based on the hydraulic diameter varying from 10 000 to 45 000 with water as the working medium were investigateden_US
dc.description.librariandc2014en_US
dc.format.extent10 pagesen_US
dc.format.mediumPDFen_US
dc.identifier.citationVan Zyl, WR, Dirker, J & Meyer, JP 2012, Single-phase convective heat transfer and pressure drop coefficients in smooth concentric annuli, Paper presented to the 9th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Malta, 16-18 July, 2012.en_US
dc.identifier.isbn9781868549863
dc.identifier.urihttp://hdl.handle.net/2263/42886
dc.language.isoenen_US
dc.publisherInternational Conference on Heat Transfer, Fluid Mechanics and Thermodynamicsen_US
dc.relation.ispartofHEFAT 2012en_US
dc.rightsUniversity of Pretoriaen_US
dc.subjectConvective heat transfer capabilitiesen_US
dc.subjectVarying diameter ratiosen_US
dc.subjectSmooth concentric tube-in-tube heat exchangersen_US
dc.subjectHeat transfer coefficientsen_US
dc.subjectWilson plot techniqueen_US
dc.subjectNusselt numbersen_US
dc.titleSingle-phase convective heat transfer and pressure drop coefficients in smooth concentric annulien_US
dc.typePresentationen_US

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