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1、第31卷第3期航空學報V01．31No．32010年3月ACTAAERONAUTICAETASTRONAUTICASINICAMar．2010文章編號：1000—6893(2010)03—0472—08分形樹狀通道換熱器內(nèi)的流動換熱特性陳永平，楊迎春，施明恒，吳嘉峰(東南大學能源與環(huán)境學院，江蘇南京210096)CharacteristicsofHeatandFluidFlowinFractalTree-likeChannelHeatSinkChenYongping。YangYingchun，ShiMingheng，WuJiafeng(SchoolofEnergyandEnvironmen
2、t，SoutheastUniversity，Nanjing210096，China)摘要：建立了分形樹狀通道換熱器中層流流動與傳熱的三維穩(wěn)態(tài)模型，采用流固耦合計算方法對人口水力直徑為4mm的矩形截面樹狀通道內(nèi)流動換熱進行了數(shù)值模擬，重點研究了分叉效應對傳熱的強化機理和換熱器受熱面的溫度分布。研究結(jié)果表明：分叉處形成的二次流能有效地強化換熱；與傳統(tǒng)的蛇形通道相比，分形樹狀通道換熱器具有溫度均勻性好、壓降小的明顯優(yōu)勢。在相同入口雷諾數(shù)時，分形樹狀通道換熱器受熱面的最大溫差遠小于蛇形通道換熱器，另外，分形樹狀通道的層流流動壓降較之蛇形流道可減小50％以上。同時，加工了分形樹狀通道換熱器及蛇形通道
3、換熱器各一套，對數(shù)值模擬結(jié)果進行了實驗驗證。實驗值與模擬值能較好地吻合，證明了所建流動換熱三維數(shù)值模型正確可信。關(guān)鍵詞：分形；換熱器；流動；傳熱；均溫性中圖分類號：V211．3；TKl24文獻標識碼：AAbstract：Athree—dimensional(3D)steadymodelforheattransferandlaminarfluidflowinfractaltree—likechannelheatsinkisdeveloped．Thelaminarconvectiveheattransferinthefractaltree-likechannelheatsinkwithanin
4、lethydraulicdiameterof4mmforrectangularcross—rsectionisnumericallysimulatedbyliquid—。solidcouplingnumericalmethod．ThesignificantheattransferenhancementmechanismbythebifurcationsandthetemperaturedistributiononheatingSUrfaceisdiscussedindetail．Theresultsindicatethatthesecondaryflowmotiongeneratedatb
5、ifurcationscaneffeetivelyenhanceheattransfer．Fractaltree-likechannelheatsinkhasobviousadvantagesoverthetraditionalserpentineflowpatterninbothheattransferandpressuredrop．UnderthesameinletReynoldsnumber，themaximumtemperaturedifferenceonthesurfaceoffractaltreelikechan-nelheatsinkisfarlessthanthatofse
6、rpentineflowpattern；thepressuredropoflaminarfluidflowinfractaltree-likechannelislessthanthatinserpentinechannelbyover50％．Inaddition，afractaltree-likechannelheatsinkandaserpentinechannelheatsinkarerespectivelydesignedandfabricatedtOconducttheverificationexperimentfornumericalsimulation．Thetemperatu
7、redistributionandpressuredropmeasuredbyexperimentareinagoodagreementwiththoseobtainedbynumericalsimulation，whichverifiesedthattheproposed3Dmodelisreliable．Keywords：fractal；heatsink；fluidflow；heattransfer；temperat
