(非常重要)COMSOL模拟液滴内部流动.pdf

《(非常重要)COMSOL模拟液滴内部流动.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

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