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1、天津大學(xué)碩士學(xué)位論文微通道內(nèi)微細顆粒對氣液傳質(zhì)的影響研究姓名:謝靈丹申請學(xué)位級別:碩士專業(yè):化學(xué)工程指導(dǎo)教師:蔡旺鋒201006摘要固體顆粒強化氣液傳質(zhì),是化工過程的強化手段之一。同時微反應(yīng)器小尺寸產(chǎn)生的優(yōu)勢也日益受到人們的重視,其過程強化、反應(yīng)安全、數(shù)量放大等特點引領(lǐng)反應(yīng)器設(shè)計向著一個新的方向發(fā)展。本文在微通道內(nèi)研究微米級顆粒對氣液兩相流型和氣液傳質(zhì)的影響。并引入無因次群,極性材料,覆蓋率等概念解釋觀察到得現(xiàn)象。流型實驗部分在自制的直徑為507um和6211.[m的玻璃微通道中進行,以c02.H20為兩相流體系,觀察到不同氣液流速
2、下微通道內(nèi)分別出現(xiàn)泡狀流、Taylor流以及Taylor-環(huán)狀流三種流型。并通過兩種通道流型分布圖考察了一定的氣液流速條件下,不同管徑的微通道內(nèi)兩相流流型的變化,以及對比超細CuO固體顆粒加入前后流型分布圖的變化。傳質(zhì)實驗部分在507pm的玻璃微通道內(nèi)進行,考察不同種類的固體顆粒,對C02.H20體系傳質(zhì)系數(shù)的影響。不同的固體顆粒的加入會對氣液間的傳質(zhì)吸收產(chǎn)生不同的影響?;钚蕴?,作為非極性顆粒,能較大幅度的增強微通道內(nèi)極性溶劑水的吸附性。金屬氧化物顆粒對氣液傳質(zhì)增強因子的影響,表現(xiàn)為在某一顆粒濃度達到最大值。增強因子與顆粒在氣液界面
3、的覆蓋率有關(guān)。隨顆粒濃度增加,表面覆蓋率達到它的極限值。關(guān)鍵詞:微通道兩相流型固體顆粒傳質(zhì)增強因子ABSTRACTGas—liquidmasstransferenhancementbydispersedparticleisanimportantintensificationmethodofchemicalengineeringprocess.Andmicro-reactorshaveattractedmoreandmoreattentionsfortheiradvantagesbroughtfromsizereductionandp
4、roducedprocessintensification,intrinsicsafetyand‘number-up’,whichleaddevelopmentofreactordesigntowardanewhorizon.Thispaperstudiestheeffectsinthemicro··channelofsolidparticlesonthegas--liquidflowpattemandenhancementofmasstransfer,andexplainstheresultsgotbyDimensionlessN
5、umbers,PolarityMaterials,andCoverage.Intheflowpatternexperimentalpart,twoglassmicro-channelswereselffabricated,whosehydrodynamicdiameterswere507p,mand621prorespectively.Theeffectsofmicro··channeldiameterandparticleonthetwo·-phaseflowpattemofH20-C02systemwereinvestigate
6、d.Bubblyflow,TaylorflowandTaylor-annularflowwererecordedinboth507proand621pmmicro-channelsundertheexperimentalconditionsbyahi曲一speedCCDcamera.Afteranalyzingimagesweconcludedthatdiametersofmicro-channelsaffectedtheflowpatternmapsbecauseofthedominanceofsurfacetensioninmi
7、cro-channel,andtheparticleaffectedtheflowpattemmapsbecauseofthesametheory.Inthemasstransferexperimentalpart,themicro-channelwhosehydrodynamicdiameterWas5071.tmwasused.ThemasstransferratiounderdifferentconditionsWasinvestigated.However,differentenhancementfactorsofgas-l
8、iquidareobtainedwimdifferentparticle.KEYWORDS:micro-channel,gas-liquidflowpattern,particle,masstransfer,enhancementfa