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

dc.contributor.authorVan Zyl, W.R. (Warren Reece)
dc.contributor.authorDirker, Jaco
dc.contributor.authorMeyer, Josua P.
dc.contributor.emailjaco.dirker@up.ac.zaen_US
dc.date.accessioned2013-10-03T12:24:11Z
dc.date.available2014-04-30T00:20:06Z
dc.date.issued2013
dc.description.abstractVarying diameter ratios associated with smooth concentric tube-in-tube heat exchangers are known to have an effect on their 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 data set of experimental measurements on heat exchangers with annular diameter ratios of 0.483, 0.579, 0.593, and 0.712 with respective hydraulic diameters of 17.01 mm, 13.84 mm, 10.88 mm, and 7.71 mm was gathered. Mean Nusselt numbers were determined using the modified Wilson plot method, a nonlinear regression scheme, and the logarithmic mean temperature difference method. These three methods presented disagreements with existing correlations based on local wall temperatures. The local Nusselt numbers were determined using the logarithmic mean temperature difference method. Local wall temperature measurements were made using a novel method that minimized obstructions within the annulus. Friction factors were calculated directly from measured pressure drops across the annuli. Both heated and cooled horizontal annuli in fully turbulent flow with Reynolds numbers based on the hydraulic diameter varying from 10,000 to 45,000 with water as the working medium were investigated.en_US
dc.description.librarianhb2013en_US
dc.description.urihttp://www.tandf.co.uk/journals/titles/01457632.aspen_US
dc.identifier.citationVan Zyl, WR, Dirker, J & Meyer, JP 2013, 'Single-phase convective heat transfer and pressure drop coefficients in concentric annuli', Heat Transfer Engineering, vol. 34, no. 13, pp. 1112-1123.en_US
dc.identifier.issn0145-7632 (print)
dc.identifier.issn1521-0537 (online)
dc.identifier.other10.1080/01457632.2013.763550
dc.identifier.urihttp://hdl.handle.net/2263/31899
dc.language.isoenen_US
dc.publisherRoutledgeen_US
dc.rights© Taylor & Francis. This is an electronic version of an article published in Heat Transfer Engineering, vol. 34, no. 3, pp. 1112-1123, 2013. doi : 10.1080/01457632.2013.763550 Heat Transfer Engineering is available online at : http://www.tandf.co.uk/journals/titles/01457632.aspen_US
dc.subjectSingle-phaseen_US
dc.subjectHeat transferen_US
dc.subjectConcentric annulien_US
dc.titleSingle-phase convective heat transfer and pressure drop coefficients in concentric annulien_US
dc.typePreprint Articleen_US

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