Experimental investigation and modelling of flow boiling heat transfer of c3f8/c2f6 blends

dc.contributor.authorDoubek, M.en
dc.contributor.authorHaubner, M.en
dc.contributor.authorHouska, D.en
dc.contributor.authorVacek, V.en
dc.contributor.authorBattistin, M.en
dc.contributor.authorHallewell, G.en
dc.contributor.authorKatunin, S.en
dc.contributor.authorRobinson, D.en
dc.date.accessioned2017-09-19T12:48:48Z
dc.date.available2017-09-19T12:48:48Z
dc.date.issued2017en
dc.descriptionPapers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 .en
dc.description.abstractWe have obtained an extensive data set of heat transfer coefficient (HTC) measurements in (R-218, C3F8)/(R-116, C2F6) zeotropic refrigerant blends. A horizontal thin-wall tube with a circular cross-section and diameter of 4 mm was used as an evaporator. The data covers heat fluxes from 3.5 to 10 kW.m-2, mass fluxes from 91 to 264 kg.m-2s-1 and C2F6 fractions from 0 to 25% molar. Various flow regimes were clearly identified via the HTC measurements on both the top and bottom of the tube. Boiling liquid was observed to pool at the bottom of the tube at low mass fluxes, while an annular flow regime was achieved at higher mass fluxes. The C3F8/C2F6 saturated fluorocarbon blends are zeotropic, exhibiting the usual behaviour where the HTC of the blend is lower than those of its pure components. A comparison between the data and several models of flow boiling heat transfer is presented. The comparison includes a flow map that predicts various flow boiling regimes inside a horizontal pipe.en
dc.description.sponsorshipInternational centre for heat and mass transfer.en
dc.description.sponsorshipAmerican society of thermal and fluids engineers.en
dc.format.extent10 pagesen
dc.format.mediumPDFen
dc.identifier.urihttp://hdl.handle.net/2263/62434
dc.language.isoenen
dc.publisherHEFATen
dc.rightsUniversity of Pretoriaen
dc.subjectFlow boiling heat transferen
dc.subjectC3f8/c2f6 blendsen
dc.titleExperimental investigation and modelling of flow boiling heat transfer of c3f8/c2f6 blendsen
dc.typePresentationen

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