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1、碩士學(xué)位論又氣液降膜流動(dòng)過程的傳遞現(xiàn)象研究Y1531371TransportPhenomenaOccurredinCounter-CurrentGas—LiquidFallingFilmFlow學(xué)科專業(yè):化學(xué)工程研究生:朱明指導(dǎo)教師:劉春江研究員天津大學(xué)化工學(xué)院二零零八年九月中文摘要液體降膜流動(dòng)現(xiàn)象在過程工業(yè)中有重要的應(yīng)用,深入研究降膜流動(dòng)時(shí)的傳遞現(xiàn)象對(duì)于開發(fā)新型氣液傳質(zhì)與反應(yīng)設(shè)備具有重要意義。本文首先對(duì)液體降膜流動(dòng)在過程工業(yè)中的應(yīng)用進(jìn)行了介紹,對(duì)相關(guān)的研究進(jìn)展,包括理論預(yù)測(cè),實(shí)驗(yàn)測(cè)量方面的最新研究成果進(jìn)行了綜述。本文第二部分對(duì)一種能夠強(qiáng)化氣液傳質(zhì)過程的液體雙面降膜結(jié)構(gòu)進(jìn)行了實(shí)驗(yàn)和理論研究。工
2、作內(nèi)容包括研制實(shí)驗(yàn)設(shè)備,測(cè)定不同工況下(比如不同液相進(jìn)口濃度、不同氣液相流速等)降膜傳質(zhì)效果,對(duì)比了不同填料結(jié)構(gòu)的傳質(zhì)效果;建立了描述液體雙面降膜流動(dòng)與傳質(zhì)過程的數(shù)學(xué)模型,通過模擬計(jì)算得到了相關(guān)的氣相速度分布和濃度分布,模擬結(jié)果與實(shí)驗(yàn)數(shù)據(jù)吻合較好。論文第三部分建立了描述湍流條件下氣.液兩相逆流降膜流動(dòng)與傳質(zhì)過程的計(jì)算傳遞學(xué)模型,并對(duì)模型的適用性進(jìn)行了實(shí)驗(yàn)驗(yàn)證,模擬結(jié)果和實(shí)驗(yàn)結(jié)果吻合較好。利用該模型分析了氣、液相流速變化對(duì)傳質(zhì)的影響,在此基礎(chǔ)上,又建立了流動(dòng)與傳質(zhì)過程相互耦合作用的氣.液逆流降膜解吸傳質(zhì)過程的計(jì)算傳遞學(xué)模型,結(jié)果表明考慮熱質(zhì)耦合作用的理論模型較傳統(tǒng)模型能更好地模擬層流降膜過程的傳
3、熱、傳質(zhì)現(xiàn)象。關(guān)鍵詞:兩相流;雙面降膜;湍流;熱質(zhì)耦合;計(jì)算傳質(zhì)學(xué);計(jì)算傳熱學(xué);計(jì)算流體力學(xué)ABSTRACTTransportphenomenaoffallingfilmflowcanbefoundinmanyfieldsofprocessindustry.Itisofgreatimportancetoinvestigatetheflowpatternsandmasstransferefficiencyforthedesignofnewtypeofmasstransferorchemicalreactionequipment.Thebackgroundoffallingfilmbeingapp
4、liedinprocessindustryandrecentlypublishedresearchworks,includingtheoreticalpredictionandexperimentalresearch,isintroduced.ReportsonDouble—Sidefallingfilm,fallingfilmunderturbulentcondition.a(chǎn)ndcouplingmasstransferwithheattransferarealsointroduced.Experimentaltestandcomputationalsimulationwereusedtoin
5、vestigatethemasstransferefficiencyforaDouble—Sidefallingfilmflow.Experimentalrigfortestingthemasstransferefficiencyoffallingfilmflowwasdesignedandtheconcentrationchangeoftheliquidphaseunderdifferentoperatingconditions,suchasflowrateofgasandliquid,weremeasured.Modelsforsimulatingmasstransferofthefall
6、ingfilmflowweredevelopedtopredicttheprofilesofvelocityandconcentrationingasandliquidphase.Thesimulatedresultsfitwellwithexperimentaldata.Theoreticalmodelforsimulatingthedesorptionprocessofiso-propanolsolutionintonitrogenwasproposed.Inthemodelsimultaneoustransportphenomenaofmomentum.heatandmasstransf
7、erprocesseswasconsidered.Experimentalworkwascarriedouttoverifytheproposedmodel.Itwasfoundthatthesimulatedresultswereingoodagreementwiththeexperimentaldatainsomecases.Theinfluenceofgasandliquidinletvel