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ID:52411824
大小:4.00 MB
页数:8页
时间:2020-03-27
《截面形状对疏水性微肋阵内减阻特性的影响.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、第52卷第22期2016年l1月机械工程学报JOURNALOFMECHANICALENGINEERINGV01.52NOV.NO.222016DoI:10.3901/JME.2016.22.153截面形状对疏水性微肋阵内减阻特性的影响冰姜桂林管宁张承武刘志刚(山东省科学院能源研究所济南250014)摘要:在截面为圆形、菱形和椭圆形微肋阵内涂覆不同性能的疏水性涂层,形成疏水性微肋阵。去离子水在疏水性微肋阵内表面的接触角分别为99.50、119.5。和151.50。测试去离水以不同流速流经疏水性试验段流道内压
2、力降和摩擦阻力系数。试验结果表明,在相同的接触角和流量下,圆形微肋阵内压力降最高而椭圆形最低;当接触角为99.5。,雷诺数Rg低于600时,椭圆形微肋阵内减阻率要高于菱形和圆形微肋阵,当Re>600时前者要低于后两者。随着接触角的增大,圆形内减阻率要明显高于菱形和椭圆形微肋阵,菱形和椭圆形微肋阵在低尺8下较为接近,在高尺8下前者的减阻率要高于后者;表面疏水性处理能够显著降低摩擦阻力,同时推迟流动分离和尾流区转捩,因此对于分离较早、压差阻力较大的微肋阵的减阻效果更加明显。关键词:疏水性微肋阵;接触角;压力降
3、:摩擦阻力系数;减阻率中图分类号:TKl24CharacteristicsofDragReductioninDifferentCrossSectionsofHydrophobicMicroPinFinsJIANGGuilinGUANNingZHANGChengwuLIUZhigang(EnergyResearchInstitute,ShandongAcademyofSciences,Jinan250014)Abstract:Thehydrophobiccoatingswithdifferentproper
4、tiesarecoatedonthesurfacesofmicropinfinswithdifferentcrosssectionofcircular,diamondandelliptical,respectively,andhydrophobicmicropinfinsareformed.Thecontactangleofthedeionizedwateronthesurfaceofhydrophobicmicropinfinsis99.50,119.5。and151.5。,respectively.T
5、hepressuredropandthefrictionresistancecoefficientaremeasuredexperimentallywhenwaterflowthroughthehydrophobicmicropinfinsatdifferentflowrates.Experimentalresultsshowthatthepressuredropinthecircularmicropinfinsishighestandtheellipseisminimumatthesamecontact
6、angleandflowrate,andthefrictionalresistancecoefficientinellipsemicropinfinsishigherthanthatindiamondandcircularmicropinfinswhenthecontactangleis99.5degreesandReynoldsnumberReislessthan600;however,theformerislowerthanthatofthe1attertwowhenRe>600.Theresista
7、ncereductionrateofcircularmicropinfinsiShigherthanthatofthediamondandellipsemicropinfinswiththeincreaseofthecontactangleandthoseofthediamondandtheellipseiScloseatlOWRe,butthediamondishigherthantheellipseathighRe.Thesurfacehydrophobictreatmentcansignifican
8、tlyreducethefrictionresistance,atthesametimeitdelayflowseparationandthetransitionfromlaminarflowtoturbulentflowatthewake,SOtheresistancereductioneffectofmicropinfinsismoreobviousfortheearlierseparationandthelagerdif
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