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

Show simple item record

dc.contributor.author Van Zyl, W.R. (Warren Reece)
dc.contributor.author Dirker, Jaco
dc.contributor.author Meyer, Josua P.
dc.date.accessioned 2013-10-03T12:24:11Z
dc.date.available 2014-04-30T00:20:06Z
dc.date.issued 2013
dc.description.abstract Varying 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.librarian hb2013 en_US
dc.description.uri http://www.tandf.co.uk/journals/titles/01457632.asp en_US
dc.identifier.citation Van 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.issn 0145-7632 (print)
dc.identifier.issn 1521-0537 (online)
dc.identifier.other 10.1080/01457632.2013.763550
dc.identifier.uri http://hdl.handle.net/2263/31899
dc.language.iso en en_US
dc.publisher Routledge en_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.asp en_US
dc.subject Single-phase en_US
dc.subject Heat transfer en_US
dc.subject Concentric annuli en_US
dc.title Single-phase convective heat transfer and pressure drop coefficients in concentric annuli en_US
dc.type Preprint Article en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record