Comparison of the heat transfer characteristics of developing and fully developed flow in smooth tubes in the transitional flow regime

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dc.contributor.author Everts, M. en
dc.contributor.author Meyer, Josua P. en
dc.date.accessioned 2017-08-28T07:08:28Z
dc.date.available 2017-08-28T07:08:28Z
dc.date.issued 2016 en
dc.description Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016. en
dc.description.abstract The transitional flow regime has been mostly avoided by designers due to uncertainty and perceived chaotic behavior. However, changes in operating conditions, design constraints or additional equipment can cause the flow to operate in the transitional flow regime. Previous work done in the transitional flow regime did not focus specifically on how the heat transfer characteristics change as the flow develops across the tube length. Therefore, the purpose of this study is to investigate and compare the heat transfer characteristics of developing and fully developed flow in the transitional flow regime and is work in progress. An experimental set-up was designed, built and validated and heat transfer measurements were taken at a heat flux of 2 kW/m2 between Reynolds numbers of 700 and 10 000. The Nusselt numbers varied between 10 and 68, the Prandtl number between 4.9 and 6.8, the Grashof number between 1.89x103 and 3.14x104 and the Rayleigh number between 9.66x103 and 2.24x105. It was found that the width of the transitional flow regime decreased along the tube length as the flow approached fully developed flow. Once the flow was fully developed, the width became negligible as the flow fluctuated between the laminar and low-Reynolds-number-end regimes. en
dc.format.extent 10 pages en
dc.format.medium PDF en
dc.identifier.uri http://hdl.handle.net/2263/62042
dc.language.iso en en
dc.publisher HEFAT en
dc.rights University of Pretoria en
dc.subject Transitional flow regime en
dc.subject Smooth tubes en
dc.subject Heat transfer characteristics en
dc.title Comparison of the heat transfer characteristics of developing and fully developed flow in smooth tubes in the transitional flow regime en
dc.type Presentation en


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