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时间:2020-02-29
《竖直通道内双水平圆管自然对流的数值模拟.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第38卷第〇1.38No.l1期工程热物理学报V,2017年1OURNALOFENGINEERINGTHERMOPHYSICSJan.2017月J,竖直通道内双水平圆管自然对流的数值模拟王治云李梦潺杨茉上海理工大学能源与动力工程学院,上海200093()摘要采用非稳态的层流模型对竖直通道内竖直布置的两根水平圆管的自然对流换热进行了数值模拟研究。分析了管1间距对圆管自然对流流动和换热以及时间特性的影响:S,上。数值模拟结果表明随着管间距的增大下管之间的流动增81上管换热的增强幅度较下管明显H=强,越大,上
2、管的换热增强越明显。在a10时,上下管的换热并不随着5的变,化而呈现单调的变化,不同参数下上下管的换热呈现出稳态、准周期振荡、周期振荡和混沌的时间特性。所得结果可为,管束式换热器的传热计算提供理论参考。关键词数值模拟;自然对流;水平圆管;通道;--中图分类号:TK124文献标识码:A文章编号:0253231X201701015907()NumericalSimulationontheNaturalConvectionOveraPairofHorizontalCylindersinaVertical
3、ChannelWANGZhi-YunLIMeng-ChanYANGMoColleeofEnerandPowerEnineerinUniversitofShanhaiforScienceandTechnoloShanhai200093China,y,(ggyggggyg,)AbstractNumericalsiiimlationisperformedbyadoptingunsteadylaminarmodeforthenatiiralconvectaroundafhor
4、izllderconfinedavealchannel.Thfleofionpairoontacyinsinrticeinuencthelongitudinalpitchbetweenthecylindersontheflowandheattransferandtheirtransientcharacterizationisanalzed.Thenumericalresultsshowthattheflowbetweenthetwohorizontaly,clind
5、ersbecomeintensivewithincreaseofthelongitudinalitch5andtheeffectoftheheattransferyp,enhancementontheuppercylinderismoreobviousthanthatontheloweronetheextentofthe,ua'ppercylinder^heattrnsferenhancementislargerthanthatofthelowerones
6、withincreaseof8Ralehnumb.Wh=hheafhldieren/?a10tettransferotetwocinersisnotmonotonicfunctionyg,yofS.Thetransientcharacterizationoftheheattransferofthecylindersaresummarized.AndwithchanesofRaleihnumberandhelonitudinalichheansienharacisic
7、ofheheaergygtgptttrtcterttttransf,oftwohorizontalcl--llindersaearsteadstateuasieriodicosciatoreriodicoscillatorandyppy,qpy,pychaotic.Theresultscanbetheoreticalreferenceforthecalculationofheattransferintubebundleheatexchaner.gKeywordsnum
8、ericalsimulation;naturalconvection;horizont
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