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ID:48088621
大小:4.21 MB
页数:13页
时间:2019-11-25
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1、AppliedThermalEngineering108(2016)628–640ContentslistsavailableatScienceDirectAppliedThermalEngineeringjournalhomepage:www.elsevier.com/locate/apthermengResearchPaperHeattransfercharacteristicsandinternalfluidityofasessiledropletonhydrophilicandhydrophobicsurfacesaa,b,⇑a,baaAbdul
2、lahAl-Sharafi,BekirS.Yilbas,AhmetZ.Sahin,HaiderAli,H.Al-QahtaniaMechanicalEngineeringDepartment,KFUPM,Dhahran31261,SaudiArabiabCenterofExcellenceforRenewableEnergy,MechanicalEngineeringDepartment,KFUPM,Dhahran31261,SaudiArabiahighlightsHeattransferfromdirectionmodifiesrotationofc
3、irculationcellsindroplet.Marangoniflowcurrentisdominantinsidedroplet.Nusseltnumberincreaseswhenheattransferoccursfromsubstratesurfacetodroplet.Nusseltnumberattainshighervaluesforhydrophobicsurfacethanhydrophilicsurface.NewnumberintroducedcombinestheBondnumberandinterfacialsur
4、faceenergies.articleinfoabstractArticlehistory:Heattransfercharacteristicsforasessiledropletareexaminedforvariousdropletcontactanglesresem-Received27May2016blinghydrophilicandhydrophobiccharacteristicsofthesurface.Intheheattransferanalysis,twocasesRevised17July2016areconsideredi
5、ncludingheattransferfromdroplettothesubstratesurface(case1)andheattransferAccepted19July2016fromthesubstratesurfacetothedroplet(case2).Temperatureandflowfieldsinsidethedropletaresim-Availableonline20July2016ulatedandvelocitypredictionsarevalidatedthroughtheexperimentaldata.Variati
6、onoftheNusseltandtheBondnumberswiththedropletcontactangleisanalyzedfortwoheatingsituations(case1andcaseKeywords:2).ThefindingsrevealedthattwocounterrotatingcirculationcellsareformedinsidethedropletfortheSessiledropletcaseofhydrophilicsurfacecharacteristics.Thenumberofcirculationc
7、ellsincreasestofourforthecaseofHeattransferContactanglehydrophobicsurfacecharacteristics.ThisbehaviorisattributedtothecombineeffectoftheMarangoniNusseltnumberandthebuoyancyforcesontheflowfield.RotationaldirectionofthecirculationcellschangeswiththeBondnumberheattransferdirection(ca
8、se1andcase2)andtheNusseltnumberattainshigherval
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