미니채널 내 물-에탄올 혼합물로 구성된 단일 액체 슬러그 계면 깨짐 현상에 대한 실험적 연구
An Experimental Study of Interfacial Break-up of a Water-Ethanol Mixture Slug in a Hydrophobic Mini-Channel
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A two-phase flow in mini-channels is consist with various flow regimes (such as bubble slug, annular, churn flow) according to gas and liquid phase flow rates. A previous researches revealed that in a case of slug flow in hydrophobic mini-channels, gas and liquid phase are perfectly separated by interfaces and triple contact line. In this study, the single dry slug flow experiments in circular mini-channel ( D = 1.018 mm) are conducted to observe interfacial break-up phenomena in high capillary number range ( Ca < 0.02). The slug is consist with D.I. water or D.I. water-ethanol binary mixtures (5% and 10%, mole fraction). On the base of previous researches, we calculate the pressure drop at moving triple contact line. In an addition, a single dry slug flow is visualized by using high-speed camera. Through the experiment, three regimes of pressure drop are observed; steady, loss, separation. As a result, criteria between steady and loss regimes is closely related to capillary number, and criteria between loss and separation regimes is related to surface tension.
Abstract
A two-phase flow in mini-channels is consist with various flow regimes (such as bubble slug, annular, churn flow) according to gas and liquid phase flow rates. A previous researches revealed that in a case of slug flow in hydrophobic mini-channels, gas and liquid phase are perfectly separated by interfaces and triple contact line. In this study, the single dry slug flow experiments in circular mini-channel ( D = 1.018 mm) are conducted to observe interfacial break-up phenomena in high capillary number range ( Ca < 0.02). The slug is consist with D.I. water or D.I. water-ethanol binary mixtures (5% and 10%, mole fraction). On the base of previous researches, we calculate the pressure drop at moving triple contact line. In an addition, a single dry slug flow is visualized by using high-speed camera. Through the experiment, three regimes of pressure drop are observed; steady, loss, separation. As a result, criteria between steady and loss regimes is closely related to capillary number, and criteria between loss and separation regimes is related to surface tension.
참고문헌 (8)
- S. Graimella, "Condensation pressure drop in circular mi-crochannels", Heat Transfer Engineering, 26(3), pp.28~35 (2005)
- C. Y. Lee, "Effect on interfacial tensions on behavior of two-phase plug flow in round mini-channels", The 8th International Symposium on Transport Phenomena, pp.27~30 (2007)
- D. I. Yu, "Pressure drop and dynamic contact angle of triple-line motion in a hydrophobic microchannel", Experimental Thermal and Fluid Sciences, 39, pp.60~70 (2012)
- 서경덕, "소수성 미니채널 내 물-에탄올 혼합 액적 슬러그 거동에 따른 접촉선에서의 압력강하에 대한 실험적 연구", 한국기계기술학회지, 21(4), pp.606~612 (2019), 한국기계기술학회[DOI]
- E. A. Chinnov, "Two-phase flows in pipes and capillary channels", High Temperature, 44(5), pp.773~791 (2006)
- D. Pecar, "Volumetric properties of ethanol-water mixtures under high temperatures and pressures", Fluid Phase Equilibria, 230, pp.36~44 (2005)
- B. Gonzalez, "Density, dynamic viscosity and drived properties of binary mixtures of methanol or ethanol with water, ethyl acetata and methyl acetate at T=(293.15, 298.15 and 303.15) K", Journal of Chemical Thermodynamics, 39, pp.1578~1588 (2007)
- G. Vazquez, "Surface Tension of Alcohol + Water from 20 to 50°C", Journal of Chemical & Engineering Data, 40, pp.611~614 (1995)