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Modelling long term pressure and temperature oscillations in the flow boiling in microchannels

dc.contributor.authorGrzybowski, H.
dc.contributor.authorMosdorf, R.
dc.date.accessioned2015-04-24T09:18:44Z
dc.date.available2015-04-24T09:18:44Z
dc.date.issued2012
dc.description.abstractPaper presented at the 9th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Malta, 16-18 July, 2012.en_ZA
dc.description.abstractHeat exchangers equipped with microchannels have many industrial applications. This is due to their capability for transfer of high heat fluxes. In flow boiling in microchannels three different flow regimes: steady bubbly/slug flow regime, bubbly/annular alternating flow and annular/mist alternating flow have been observed. In the present paper the model of heat and mass transfer in microchannels system has been proposed. Oscillations between quasi steady state of boiling in microchannels have been considered. Changes of two-phase flow in microchannels have been described by the relations between: heating surface temperature, vapour quality, liquid mass flux, pressure drop in microchannels and heat flux absorbed by boiling liquid. Simulation results indicate that shape of curve pressure-drop-versus-flow-rate is responsible for appearance or disappearance of heating surface temperature and pressure oscillations.en_ZA
dc.description.librariandc2014en_ZA
dc.format.extent5 pagesen_ZA
dc.format.mediumPDFen_ZA
dc.identifier.citationGrzybowski, H & Mosdorf, R 2012, Modelling long term pressure and temperature oscillations in the flow boiling in microchannels, Paper presented to the 9th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Malta, 16-18 July, 2012.en_ZA
dc.identifier.isbn9781868549863
dc.identifier.urihttp://hdl.handle.net/2263/44792
dc.language.isoenen_ZA
dc.publisherInternational Conference on Heat Transfer, Fluid Mechanics and Thermodynamicsen_ZA
dc.relation.ispartofHEFAT 2012en_US
dc.rightsUniversity of Pretoriaen_ZA
dc.subjectHeat exchangersen_ZA
dc.subjectMicrochannelsen_ZA
dc.subjectHigh heat fluxesen_ZA
dc.subjectFlow regimesen_ZA
dc.subjectAnnular alternating flowen_ZA
dc.subjectHeat and mass transfer in microchannels systemen_ZA
dc.subjectTwo-phase flowen_ZA
dc.subjectPressure oscillationsen_ZA
dc.subjectLiquid mass fluxen_ZA
dc.subjectPressure drop in microchannelsen_ZA
dc.subjectHeat fluxen_ZA
dc.titleModelling long term pressure and temperature oscillations in the flow boiling in microchannelsen_ZA
dc.typePresentationen_ZA

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