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1、118上海AEROSPACE航天SHANGHAI第33卷2016年第3期文章編號:1006—1630(2016)03011806平行微細通道內(nèi)流動沸騰換熱的重力無關(guān)性研究陳彬彬,董麗寧,徐濤,王江,趙小翔,曹建光(上海衛(wèi)星工程研究所,上海200240)摘要:為驗證微細通道內(nèi)流動沸騰散熱技術(shù)在空間的適用性,用實驗方法研究了平行微細通道內(nèi)流動沸騰換熱的重力無關(guān)性。搭建了兩相流體回路系統(tǒng),設(shè)計了水力直徑0.91mm、倒梯形截面的平行微細通道銅基熱沉,通過電火花腐蝕技術(shù)在銅基加熱器表面刻蝕制作微細通道,兩者集成一體。由實驗分析
2、了90?!?0。不同重力傾角下微通道內(nèi)的流動沸騰特性。結(jié)果發(fā)現(xiàn):不同流量下不同重力傾角的微細通道的沸騰曲線基本吻合,臨界熱流值基本一致,表明微通道不僅強化換熱能力,而且削弱了重力對沸騰換熱的影響。實驗結(jié)果處于文獻中Bo準則和Fr準則的重力無關(guān)性區(qū)域內(nèi),驗證了微細通道內(nèi)流動沸騰換熱具一定程度的重力無關(guān)特性,地面上測得的微通道內(nèi)流動沸騰換熱系數(shù)和臨界熱流等實驗數(shù)據(jù)能安全有效用于空間環(huán)境的熱控設(shè)計。關(guān)鍵詞:微細通道;兩相流體回路;流動沸騰;換熱;重力無關(guān);熱沉;臨界熱流;Bo準則;Fr準則中圖分類號:TKl24文獻標志碼:A
3、DOI:10.19328/j.cnki.10061630.2016.03.019InvestigationonGravityIndependenceofFlowBoilingHeatTransferinParallelMicro/Mini—ChannelsCHENBin—bin,DONGIA—ning,XUTao,WANGJiang,ZHAOXiao—xiang,CAOJianguang(ShanghaiInstituteofSatelliteEngineering,Shanghai200240,China)Abstr
4、act:InordertOchecktheapplicabilityofflowboilingheattransferinmicro/mini—channelstechniquesinspace,afluidlooptestsystemwasappliedtOinvestigatethegravityindependenceinparallelmicro/mini—channelsheatsinkinthispaper.Thetwophaseloopsystemwashuihup.Thecopperheatsinkwi
5、thhydraulicdiameter0.91mmandinvertedtrapezoidalsectionwasdesigned.Themicro/minichannelsweremadeonthesurfaceofthesinkusingsparkerosion,whichwasintegratedwiththesink.Theboilingheattransfercharacteristicsunderdifferentgravityorientationsfrom90。tO90。werediscussedbyt
6、hetest.Itwasfoundthatflowboilingexperimentswithvariousflowsunderdifferentgravityorientationsexhibitedalmostthesameboilingcurveandcriticalheatflax(CHF)values,whichmeantthatthemicro/minichannelscouldnotonlyenhancetheheattransferbutalsoweakentheeffectofgravityonthe
7、boilingheattransfer.ThetestresultswereinthegravityindependenceareaoftheBocriterionandFrcriterioninthereferences.Theexperimentaldatawithgravityindependencecriteriafromreferencesverifiedfurtherthatflowboilingheattransferinmicro/minichannelwassomewhatgravityindepen
8、dence,andtheexperimentaldataincludingflowboilingtransfercoefficientandCHFofthemicro/minichannelsmeasuredonthegroundcouldapplyindesignofthethermalcontrolsysteminspace.