Experimental study on condensation, frost formation and condensate retention on microgrooved and plain brass surfaces under natural convection condition

dc.contributor.authorRahman, M.A.
dc.contributor.authorJacobi, A.M.
dc.date.accessioned2014-07-03T07:42:39Z
dc.date.available2014-07-03T07:42:39Z
dc.date.issued2011
dc.description.abstractPaper presented at the 8th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Mauritius, 11-13 July, 2011.en_US
dc.description.abstractIn this study, frost was grown on microgrooved and baseline brass samples under specific operating conditions and a comparison of condensation, frosting and defrosting pattern on microgrooved and flat brass surfaces were carried out experimentally. The surfaces were fabricated by mechanical micro-machining process and no chemical alteration of the surface was conducted. It was found that the shape, size and distribution of condensed water droplets and subsequent frost structure are significantly affected by the micro-scale roughness on the surface. The condensed water droplets took an elongated shape and then coalesced along the pillars and grooves on grooved surfaces giving a parallel brick-like frosting pattern. The frost structure on the grooved surface was different than that on the flat surface and frost crystal exhibited more directional growth in the parallel to the surface direction, with numerous ice-flakes growing in the perpendicular and angular directions to the grooves. This non-uniform growth of the frost layer also gave the appearance of a spongy and loose frost structure and suggested the formation of less dense frost. Qualitative study of the spatial and temporal distribution of retained condensate on the grooved and plain brass surfaces after defrosting were carried out by analyzing thermal images of the sample surface during the defrosting period. Findings of this of this study can give significant insight about the frost properties and defrosting and condensate retention behaviour of heat transfer equipments with embedded microgrooves.en_US
dc.description.librarianpm2014en_US
dc.format.extent7 pagesen_US
dc.format.mediumPDFen_US
dc.identifier.citationRahman, MA & Jacobi, AM 2011, 'Experimental study on condensation, frost formation and condensate retention on microgrooved and plain brass surfaces under natural convection condition', Paper presented to the 8th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Mauritius, 11-13 July, 2011.en_US
dc.identifier.urihttp://hdl.handle.net/2263/40493
dc.language.isoenen_US
dc.publisherInternational Conference on Heat Transfer, Fluid Mechanics and Thermodynamicsen_US
dc.relation.ispartofHEFAT 2011en_US
dc.rightsUniversity of Pretoriaen_US
dc.subjectHEFATen_US
dc.subjectHeat transferen_US
dc.subjectFluid mechanicsen_US
dc.subjectThermodynamicsen_US
dc.subject8th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics 2011en_US
dc.subjectExperimental studyen_US
dc.subjectCondensationen_US
dc.subjectFrost formationen_US
dc.subjectCondensate retentionen_US
dc.subjectMicrogrooved brass surfacesen_US
dc.subjectNatural convectionen_US
dc.titleExperimental study on condensation, frost formation and condensate retention on microgrooved and plain brass surfaces under natural convection conditionen_US
dc.typePresentationen_US

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