CAJ | 학술논문

　　微通道内液液两相流的压力降对系统内部热量和质量传递具有重要影响。针对环己烷-含0.3%SDS(十二烷基硫酸钠)蒸馏水液液两相系统，利用高速摄像仪对2种不同深宽比的矩形截面直管微通道内的液液两相流进行了实时观测和记录，用压差变送器测定了其在弹状流型下的压力降。微通道尺寸(深度×宽度)分别为400μm×600μm，400μm ×800μm。结果表明：弹状流型下的压力降随系统各相流率、毛细数、雷诺数、连续相黏度的增加而增加，随两相速度比值的增加而减小，且当毛细数 Ca>0.015或雷诺数 Re>20时，压力降随着通道截面深宽比的增加而增加。基于实验结果，修正了均相流模型，提出了新的压力降预测关联式，模型计算结果与实验值吻合良好。
　　미통도내액액량상류적압력강대계통내부열량화질량전체구유중요영향。침대배기완-함0.3%SDS(십이완기류산납)증류수액액량상계통，이용고속섭상의대2충불동심관비적구형절면직관미통도내적액액량상류진행료실시관측화기록，용압차변송기측정료기재탄상류형하적압력강。미통도척촌(심도×관도)분별위400μm×600μm，400μm ×800μm。결과표명：탄상류형하적압력강수계통각상류솔、모세수、뢰낙수、련속상점도적증가이증가，수량상속도비치적증가이감소，차당모세수 Ca>0.015혹뢰낙수 Re>20시，압력강수착통도절면심관비적증가이증가。기우실험결과，수정료균상류모형，제출료신적압력강예측관련식，모형계산결과여실험치문합량호。
In microchannel, the pressure drop of liquid-liquid two-phase flow is of vital importance for intensifying heat and mass transfer of the flow system. In the present work, liquid-liquid two-phase flow in rectangular microchannels with two different aspect ratios (400μm×600μm and 400μm×800μm) was recorded by using a high-speed camera, and the pressure drop under slug flow regime was measured by using a differential pressure sensor. The cyclohexane was used as the dispersed phase and distilled water with 0.3%SDS(sodium lauryl sulfate) as the continuous phase. The results show that the pressure drop increases with the increases of the flow rates of both phases, the capillary number Ca, the Reynolds number Re and the viscosity of the continuous phase, and decreases with the increase of the velocity ratio of both phases. When Ca>0.015 or Re > 20, the pressure drop increases with the increase of the aspect ratio of the microchannel. A modified correlation for homogeneous flow model was proposed for predicting pressure drop under slug flow regime of liquid-liquid two-phase flow in microchannels, and the calculated results show good conformity to the experimental data.