Characteristics and mechanism on condensate drop movement under bulk surface temperature gradient in Marangoni Dropwise condensation

dc.contributor.authorChen, Zhihao
dc.contributor.authorUtaka, Yoshio
dc.date.accessioned2015-04-24T11:16:09Z
dc.date.available2015-04-24T11:16:09Z
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.abstractIn Marangoni dropwise condensation, condensate drops move spontaneously when a bulk temperature gradient is applied to the condensing surface. It was considered that the velocity of drop movement is strongly affected by the horizontal component of Marangoni force around a condensate drop. And it is easy to infer that the horizontal component of Marangoni force is decided by both strength of Marangoni force and shape (angle) of condensate drop. In previous studies, it was shown that the velocity of condensate drop movement increases with the increase of bulk surface tension gradient and has a strong relation to initial drop distance. Initial drop distance was adopted as a parameter to express the characteristics of drop velocity, since the qualitatively relations among initial drop distance, Marangoni force and shape of condensate drop inferred from the previous experimental results. However, those relations are still not known clearly in detail. Furthermore, the mechanism on the condensate drop movement is also still not well understood. Therefore, in this paper, experimental study was carried out and the quantitative relation between initial drop distance and angle of condensate drop is investigated. In addition, numerical calculations on the condensation process of water-ethanol vapor mixture and the behavior of condensate were performed by using the VOF (Volume Of Fluid) method to qualitatively analyze the mechanisms of condensate drop movement.en_ZA
dc.description.librariandc2014en_ZA
dc.format.extent9 pagesen_ZA
dc.format.mediumPDFen_ZA
dc.identifier.citationChen, Z & Utaka, Y 2012, Characteristics and mechanism on condensate drop movement under bulk surface temperature gradient in Marangoni Dropwise condensation, 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/2263/44831
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.subjectMarangoni dropwise condensationen_ZA
dc.subjectVelocity of drop movementen_ZA
dc.subjectMarangoni forceen_ZA
dc.subjectBulk surface tension gradienten_ZA
dc.subjectInitial drop distanceen_ZA
dc.subjectWater-ethanol vapor mixtureen_ZA
dc.subjectBehavior of condensateen_ZA
dc.subjectVolume of fluid (VOF)en_ZA
dc.titleCharacteristics and mechanism on condensate drop movement under bulk surface temperature gradient in Marangoni Dropwise condensationen_ZA
dc.typePresentationen_ZA

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