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1、上海交通大學碩士學位論文結霜工況下翅片管換熱器傳熱傳質的數(shù)值模擬姓名：劉小川申請學位級別：碩士專業(yè)：制冷與低溫工程指導教師：谷波20070101逐步增大，出口溫度和含濕量變化平緩。在實驗研究的基礎上，得到了濕空氣的壓力分布和含濕量分布。將模擬所得結果與實驗數(shù)據進行了對比，結果表明，模擬結果與實驗數(shù)據變化趨勢相同，模擬結果與實驗數(shù)據吻合較好。本文所建立的翅片管換熱器結霜模型得到了一個很好的模擬結果，此模型為國內翅片管換熱器結霜模擬和其他設備、部件的結霜模擬介紹了一個全新的方法，為同類的結霜模型搭建了一個良好的平臺。模型加深了我們對翅片管換熱器干工況、結露工況和結霜
2、工況的理解，也加深了我們對如何模擬這些工況的認識。但模型仍有不足，還需要改進。關鍵詞：翅片管式換熱器結霜模擬VINumericalsimulationonheatandmasstransferoffrostformationonfinnedtubeheatexchangerABSTRACTFinnedtubeheatexchangersareextensivelyemployedinvariousindustrialapplications.Theyarequitecompact,lightlyweight,andcharacterizedbyarelative
3、lylowcostfabrication.Acomprehensiveunderstandingontheperformanceofheatandmasstransferoffinnedtubeheatexchangersisofprimeimportancetooptimizethedesignofheatexchangersforrefrigerationandairconditioningapplications.Frostformationonfinnedtubeheatexchangeroccurswidely.Whenmoistaircomesinc
4、ontactwithcoldheatexchangersurfacewhosetemperatureisbelowfreezingpoint,frostingoccurs.Thevaporoftheairbecomesfrostandthefroststickstothesurfaceoftheheatexchanger.Thefrostactsnotonlyasathermalinsulatorbetweenthesurfaceandthehumidambientair,butalsosignificantlyreducestheperformanceofth
5、eheatexchanger,sincetheairpassagesbecomenarrowerandpressuredropgeneratedbecomeshigher.Withtimegoesby,thethicknessofthefrostlayergrows.Inaddition,inordertoensurethedefrostingperiodoffinnedtubeheatexchanger,itisnecessarytounderstandthecharacteristicsoffrostformationdeeply.Asmallunitoff
6、innedtubeheatexchangerisstudied.Fromthesimulationresultsofthemodelofsmallunit,thesimulationperformanceofwholefinnedtubeheatexchangercanbeknown.Thecontinuous,momentum,energyandgridupdatingequationsoffrostformationonfinnedtubeheatexchangerweredescribed.。Usingnumericalmethod,thefrostacc
7、umulationquantityandheattransfercapacityofevaporatorsarepredicted,whichissimplifiedtoaquasi-stableproblemforconvenience.IneverytimesteptheprocessisconsideredtobestableandtheobtainedVIIdata,thefrostthicknessandthetemperatureofthefrostsurfaceareusedastheboundaryconditionsinthenexttimes
8、tep.Accordin
