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时间:2020-03-27
《圆内开缝圆不同开缝方向自然对流换热.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、上海理工大学学报第35卷第5期J.UniversityofShanghaiforScienceandTechnologyVo1.35No.52013文章编号:1007—6735{2013)05—0425—05圆内开缝圆不同开缝方向自然对流换热申春赘,杨茉,王津,张昆,张玉文(1.上海理工大学能源与动力工程学院,上海200093;2.密苏里大学机械与航空航天工程学院,哥伦比亚65211)摘要:采用SIMPLE方法对圆内开缝圆在不同开缝方向时的自然对流换热进行了数值模拟,根据数值结果,分析了开缝圆不同开缝方向的自然对流换热规律和特性
2、.数值结果表明:采用S吼E方法的计算结果与已有文献相同工况的实验结果相吻合;同一开缝方向,平均当量导热系数K随着瑞利数Ra的增加而增大.当Ra较小时,Keqs基本不随开缝方向的改变而变化;当Ra继续增大,同一Ra下开缝方向从竖直到水平随角度增大K8gs值变小;当Ra超过一个临界值时,Keqs数值结果出现了振荡,且这个临界值与开缝方向相关;研究水平开缝的圆内开缝圆自然对流换热,随着的增加,能够获得稳定解、周期性振荡解及非周期振荡解,最终为混沌.关键词:自然对流;数值模拟;开缝圆;非线性特性中图分类号:TK124文献标志码:ANat
3、uralConvectionHeatTransferCharacteristicsofaCirclewithanInternalConcentrilcRoundSl1ottedinDi‘t’-t’erentDirectio0nSHENChun-yun,YANGMoI,WANGJin,ZHANGKun,ZHANGYu.we(1.SchoolofEnergyandPowerEmgineering,UniversityofShanghaiforScienceandTechnology,Shanghai200093,China;2.De
4、partmentofMechanicalandAerospaceFlngineering,UniversityofMissouri,Columbia,65211)Abstract:UsingtheSIMPLEmethodthenaturalconvectiontransferproblemofacirclewithaninternalslottedcirclewasnumericallysimulatedunderdifferentslottingdirections.Thenaturalconvectionheattransf
5、ercharacteristicsoftheslottedcirclewereanalysedunderdifferentslottingdifferentsaccordingtothenumericalresults,whichcoincidewellwiththeexperimentalresultsofanexistingliteratureunderthesameworkingconditions.Inthesameslottingdirection,theaverageequivalentthermalconducti
6、vityKeqsincreaseswiththeincreaseofRa。WhenRaissmall。Keqsdoesnotchangebasicallywiththechangeofslottingdirection.WhenRacontinuestoincrease,underasame,、Ⅳit}ltheslottingdirectionchangingfromverticaltohorizontal,KeqsbeconlP~smaller.WhenRaexceedsacriticalvalue,thenumericalr
7、esultofKeqsbeginstofluctuate,andthecrificalvalueisrelatedtotheslottingdirection.nnaturalconvectionheattransferofahorizontallyslottedroundwithinthecirclewasstudied.ItisconcludedthatwiththeincreaseofRaitispossibletoobtainstablesolution,periodicallyoscillatingsolutions,
8、non-periodicoscillationsolutionandultimatelyreachachaosstate.收稿日期:2013—01—04基金项目:国家自然科学基金资助项目(51076105);上海市科委振兴东北科技合作资助项目(111958205
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