Influence of free convection on the heat transfer characteristics of developing and fully developed flow in the transitional flow regime

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dc.contributor.author Everts, Marilize en
dc.contributor.author Meyer, Josua P. en
dc.date.accessioned 2017-09-19T12:48:16Z
dc.date.available 2017-09-19T12:48:16Z
dc.date.issued 2017 en
dc.description Papers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 . en
dc.description.abstract The transitional flow regime has been mostly avoided by designers due to uncertainty and perceived chaotic behavior. Previous work done in the transitional flow regime did not focus specifically on the effects of free convection on the local heat transfer characteristics along the tube length. Therefore, the purpose of this study was to investigate the effects of free convection on 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 fluxes of 1, 3 and 8 kW/m2 between Reynolds numbers of 100 and 8 000. The Nusselt numbers varied between 4.3 and 80, the Prandtl number between 2.9 and 6.5, the Grashof number between 6.8 and 1.06x104 and the Rayleigh number between 43.8 and 3.07x104. It was found that the width of the transitional flow regime decreased along the tube length as the flow approached fully developed flow. As the free convection effects were increased by increasing the heat flux, the width of the transitional flow regime decreased further. en
dc.description.sponsorship International centre for heat and mass transfer. en
dc.description.sponsorship American society of thermal and fluids engineers. en
dc.format.extent 10 pages en
dc.format.medium PDF en
dc.identifier.uri http://hdl.handle.net/2263/62314
dc.language.iso en en
dc.publisher HEFAT en
dc.rights University of Pretoria en
dc.subject Free convection en
dc.subject Heat transfer en
dc.subject Transitional flow regime en
dc.title Influence of free convection on the heat transfer characteristics of developing and fully developed flow in the transitional flow regime en
dc.type Presentation en


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