本文選題：微通道 + 氣-液兩相流　； 參考：《大連理工大學》2015年碩士論文

【摘要】：由于微反應(yīng)器在化工領(lǐng)域的巨大優(yōu)勢,微反應(yīng)器中的過程強化以及氣-液兩相流的研究受到了人們密切的關(guān)注。本文通過實驗對微通道內(nèi)氣-液兩相流動和傳質(zhì)規(guī)律進行了研究,旨在掌握微通道內(nèi)氣-液兩相流動及傳質(zhì)規(guī)律,為后期強化微通道內(nèi)傳質(zhì)提供理論指導(dǎo)。制備了1×lmm矩形截面微通道,矩形通道由親水性(0=-43.7°)的銅板加工制成,然后用十八烷基硫醇溶液處理得到疏水表面(0=-114.6°),利用高速攝像儀考察了不同壁面潤濕性下矩形微通道內(nèi)二氧化碳-水氣-液兩相流型。在親水微通道中觀測到了泡狀流、泡狀-彈狀流、Taylor流,其中Taylor流是主要流型；在疏水微通道中觀測到了非對稱彈狀流、拉長的非對稱彈狀流、分層流,其中拉長的非對稱彈狀流和分層流是主要流型。利用1×lmm矩形截面親水微通道和內(nèi)徑為1.08mm、1.26mmm的圓形玻璃毛細管,選用二氧化碳-水為工作流體,利用高速攝像儀考察了氣、液表觀流速和通道當量直徑對微通道內(nèi)Taylor流流體力學性質(zhì)的影響。實驗表明,76.9%的氣泡的長度通常為通道當量直徑的2-5倍,85.3%的液彈的長度通常為通道當量直徑的1-4倍,77.4%的泰勒單元的長度通常為通道當量直徑的5-8倍；氣泡和液彈長度大體上隨氣、液表觀流速之比的增大分別增大和減小,泰勒單元長度隨氣相表觀流速變化復(fù)雜,但隨液相表觀流速的增大而減��；通道內(nèi)的氣泡、液彈和泰勒單元長度隨通道當量直徑的增大而增大；氣泡運動速度UB與液彈平均運動速度Uslug的大小關(guān)系為：UslugUB1.28Uslug。搭建了微通道內(nèi)CO2-H2O氣-液兩相流動及傳質(zhì)研究實驗平臺,利用酸堿滴定法測定微通道中C02的吸收量,考察了氣、液表觀流速和通道壁面潤濕性對微通道內(nèi)氣液傳質(zhì)的影響。實驗表明,微通道接觸器比常規(guī)尺度氣-液接觸設(shè)備的液側(cè)體積傳質(zhì)系數(shù)KLα至少要高1-2個數(shù)量級；隨著氣、液表觀流速的增大,液彈內(nèi)循環(huán)區(qū)域液體流動速度增大,組分在液彈中的混合增強,同時,單位時間單位通道橫截面積通過的氣液兩相傳質(zhì)面積增大,故液側(cè)體積傳質(zhì)系數(shù)kLα增大；由于親水微通道和疏水微通道中兩相流型不同,親水微通道中氣液相界面積大,而且液彈內(nèi)循環(huán)區(qū)域液體流動也更快,故液側(cè)體積傳質(zhì)系數(shù)KLα隨通道壁面潤濕性的增強而增大。
[Abstract]:Due to the great advantages of microreactors in chemical industry, the study of process strengthening and gas-liquid two-phase flow in microreactors has been paid close attention to. In this paper, the law of gas-liquid two-phase flow and mass transfer in microchannels is studied through experiments. The purpose of this study is to master the law of gas-liquid two-phase flow and mass transfer in microchannels, and to provide theoretical guidance for the later enhancement of mass transfer in microchannels. A 1 脳 lmm microchannel with rectangular cross-section was prepared. The rectangular channel was fabricated by copper plate with hydrophilic (0 ~ 43.7 擄). The hydrophobic surface was then treated with octadecyl mercaptan solution to obtain the hydrophobic surface. The CO2 / water gas-liquid two-phase flow patterns in rectangular microchannels with different wall wettability were investigated by high speed camera. In hydrophilic microchannels, bubbly flow, bubbly slug flow, Taylor flow is the main flow pattern, asymmetric slug flow, elongated asymmetrical slug flow and stratified flow are observed in hydrophilic microchannels. The elongated asymmetric slug flow and stratified flow are the main flow patterns. A 1 脳 lmm rectangular section hydrophilic microchannel and a circular glass capillary with an inner diameter of 1.08 mm or 1.26 mm were used to investigate the gas, using carbon dioxide and water as the working fluid. The effects of liquid apparent velocity and channel equivalent diameter on the hydrodynamic properties of Taylor flow in microchannels. The experimental results show that the bubble length of 76.9% is usually 2-5 times of channel equivalent diameter and 85.3% of channel equivalent diameter. The length of liquid bomb is usually 1-4 times that of channel equivalent diameter, and the length of Taylor unit with 77.4% channel equivalent diameter is usually 5-8 times that of channel equivalent diameter. The increase of the ratio of liquid apparent velocity increases and decreases respectively. The Taylor cell length changes with the gas phase apparent velocity, but decreases with the increase of liquid phase apparent velocity. The length of liquid bomb and Taylor unit increases with the increase of channel equivalent diameter, and the relationship between bubble velocity UB and the average moving velocity of liquid bomb Uslug is: 1. 28 Uslug. An experimental platform for CO2-H2O gas-liquid two-phase flow and mass transfer in microchannels was set up. The absorption of CO2 in microchannels was determined by acid-base titration. The effects of gas and liquid apparent velocity and wettability on gas-liquid mass transfer in microchannels were investigated. The experimental results show that the volumetric mass transfer coefficient KL 偽 of microchannel contactor is at least 1-2 orders higher than that of conventional gas-liquid contact equipment, and the liquid velocity increases with the increase of gas and liquid apparent velocity. At the same time, the gas-liquid two-phase mass transfer area passing through the cross-sectional area of unit channel per unit time increases, so the volumetric mass transfer coefficient (KL 偽) of the liquid side increases, because the two-phase flow patterns in hydrophilic microchannels and hydrophobic microchannels are different. The gas-liquid boundary area is large in hydrophilic microchannels, and the liquid flow is faster in the liquid-bomb circulation region, so the liquid-side mass transfer coefficient KL 偽 increases with the enhancement of the wettability of the channel wall.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ052

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