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ID:52417206
大小:2.99 MB
页数:6页
时间:2020-03-27
《新型单圆锥体热沉单孔射流散热数值模拟.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第52卷第24期2016年12月机械工程学报JOURNAL0FMECHANICALENGINEERINGV01.52Dec.No.242016DoI:10.3901,JME.2016.24.136新型单圆锥体热沉单孑L射流散热数值模拟木马鹏程1唐志国1,2刘轻轻2王元哲2(1.合肥工业大学科学技术研究院合肥230009:2.合肥工业大学机械工程学院合肥230009)摘要:射流冷却是高热流密度换热的有效方法之一,其热沉形状是影响换热的关键因素。提出一种新型圆锥体热沉,应用RNGk-e湍流模型,对新型单圆锥体热沉进行单孔水冷散热数值模拟,
2、并进行试验验证。结果表明:单圆锥体热沉的散热效果明显强于常规平板热沉,前者的射流流体域比后者多一个转折区,转折区内存在二次冲击,使换热得到强化。雷诺数越大,圆锥体热沉散热性能越优异:在不同锥角(150~60。)的单圆锥体热沉传热模拟中,当锥角在45。左右时,热沉表面的平均努塞尔数Nu数最高;圆锥体底面直径d.和射流孔直径d比值在1~3范围内,Nu数在比值为2.5左右达到最大值;射流高度日与射流孔直径d比值在5左右时,Nu数趋于最大。关键词:锥体热沉;冲击射流:强化传热;数值模拟;边界层中图分类号:TKl24NumericalSimul
3、ationofCharacteristicofHeatTransferforJetImpingementwithNewSingleConeHeatSinkthroughSingleSprayNozzleMAPengcheng1TANGZhiguo1·2LIUQingqin92WANGYuanzhe2(1.InstituteofScienceandTechnology,HefeiUniversityofTechnology,Hefei230009;2.SchoolofMechanicalEngineering,HefeiUniversi
4、tyofTechnology,Hefei230009)Abstract:Jetcoolingisoneofeffectivewaystotransferthegreatfluxdensityheat,andtheheatsinkshapeofjetimpingementisakeypointaffectingheattransfer.ThenewconeheatsinkproposedisnumericallysimulatedbyusingRNGk-eturbulencemodelundertheconditionofjetimpi
5、ngementthroughasinglespraynozzleandtheresultisverifiedbyexperiments.Theresultindicatesthatthecoolingeffectofheatsinkwithasingleconeisbetterthanthatofusualflatplateheatsink,andwhencomparedwiththelatter,theformerhasanadditionaltransitionregionwhereisasecondaryimpingementw
6、hichstrengthenstheheattransfer.ThegreatertheRenumberbecomes.thebeRereffectoftheconeheatsinkwillbe;thenumericalsimulationaboutdifferentconeangle(150-60。)ofheatsinksshowsthat45。coneangleofheatsinkprovidesahighervalueofNunumberthantheothers;whend1(diameterandconicalbottom)
7、/d(jetdiameter)is1-3,andwhendI/disabout2.5,itgetsahighervalueofNunumbercomparedtotheothers;whenH(heightofthejet)/dis5,nothingaboutthecoolingeffectofheatsinkisSOgoodasthatH/disabout5.Keywords:coneheatsink;impingingjet;heattransferenhancement;numericalsimulation;boundaryl
8、ayer0前言冲击射流换热是指流体介质从一区域通过圆形或矩形等喷嘴,以一定角度喷射到固体壁面,扰动壁面附近的流动,使被冲击表面流动边界层变薄,换热效果明显[1-2】。射流冲击因其对驻点区及其有效·国家科技支撑计划(201
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