Investigation of Flow Pattern and Void Fraction of Air and Low Surface Tension Liquid in A 30° Inclined Small Pipe
Keywords:Two-phase flow, small channel, liquid surface tension, flow pattern, void fraction
Two-phase flow in the mini pipe is applied in wide fields. The most common of two-phase flow is a couple of gas and liquid. The essential properties of the liquid are density, viscosity, and surface tension. There are many variations of the flow direction, horizontal, incline, and vertical, in terms of orientation. The two-phase investigation of flow pattern and void fraction of air and low surface tension liquid in a 30° inclined small pipe has been carried out. Dry air was used as a gas phase, while the liquid was the mixture solution of distilled water and 3% (by volume) of butanol. Butanol addition aimed to decrease the surface tension, which became 42.9 millinewton/meter, instead of 71 mN/m when using distilled water. The test section was a 130 mm length, 1.6 mm inner diameter circular glass pipe. The rig used was equipped with the air compressor, pressure tank, high-speed camera, liquid flow meter, and gas flow meter. The liquid was fed to the test section by the pressurized tank, instead of directly pumped, to avoid pulsation. Ranges of gas and liquid superficial velocities were 0.025 – 66.3 m/s and 0.033 – 4,935 m/s, respectively. Flow patterns were obtained from the captured high-speed video. Meanwhile, the void fractions were acquired by image processing of the video. As a result, five distinctive flow patterns were observed: plug, slug-annular, churn, bubbly, and annular. The separated flow was absent. The change of the liquid surface tension affected the shifting of some transition boundary lines in the flow pattern map. The transition line between slug-annular and annular against churn flow was shifted to the lower side or toward lower JL when the liquid surface tension decreased. In short, the churn flow was easier to be formed when the liquid surface tension was lower.
Kawahara, A., PM-Y. Chung, and M. Kawaji. "Investigation of two-phase flow pattern, void fraction and pressure drop in a microchannel." International Journal of Multiphase Flow 28, no. 9 (2002): 1411-1435. https://doi.org/10.1016/S0301-9322(02)00037-X
Zhao, T. S., and Q. C. Bi. "Co-current air-water two-phase flow patterns in vertical triangular microchannels." International Journal of Multiphase Flow 27, no. 5 (2001): 765-782. https://doi.org/10.1016/S0301-9322(00)00051-3
Triplett, Ka A., S. M. Ghiaasiaan, S. I. Abdel-Khalik, and D. L. Sadowski. "Gas-liquid two-phase flow in microchannels Part I: two-phase flow patterns." International Journal of Multiphase Flow 25, no. 3 (1999): 377-394. https://doi.org/10.1016/S0301-9322(98)00054-8
Hassan, I., M. Vaillancourt, and K. Pehlivan. "Two-phase flow regime transitions in microchannels: a comparative experimental study." Microscale Thermophysical Engineering 9, no. 2 (2005): 165-182. https://doi.org/10.1080/10893950590945049
Lee, Chi Young, and Sang Yong Lee. "Influence of surface wettability on transition of two-phase flow pattern in round mini-channels." International Journal of Multiphase Flow 34, no. 7 (2008): 706-711. https://doi.org/10.1016/j.ijmultiphaseflow.2008.01.002
Hanafizadeh, P., M. H. Saidi, A. Nouri Gheimasi, and S. Ghanbarzadeh. "Experimental investigation of air-water, two-phase flow regimes in vertical mini pipe." Scientia Iranica 18, no. 4 (2011): 923-929. https://doi.org/10.1016/j.scient.2011.07.003
Serizawa, Akimi, Ziping Feng, and Zensaku Kawara. "Two-phase flow in microchannels." Experimental Thermal and Fluid Science 26, no. 6-7 (2002): 703-714. https://doi.org/10.1016/S0894-1777(02)00175-9
Chung, PM-Y., and M. Kawaji. "The effect of channel diameter on adiabatic two-phase flow characteristics in microchannels." International Journal of Multiphase Flow 30, no. 7-8 (2004): 735-761. https://doi.org/10.1016/j.ijmultiphaseflow.2004.05.002
Saisorn, Sira, and Somchai Wongwises. "Flow pattern, void fraction and pressure drop of two-phase air-water flow in a horizontal circular micro-channel." Experimental Thermal and Fluid Science 32, no. 3 (2008): 748-760. https://doi.org/10.1016/j.expthermflusci.2007.09.005
Sudarja, Aqli Haq, Deendarlianto, Indarto, and Adhika Widyaparaga. "Experimental study on the flow pattern and pressure gradient of air-water two-phase flow in a horizontal circular mini-channel." Journal of Hydrodynamics 31, no. 1 (2019): 102-116. https://doi.org/10.1007/s42241-018-0126-2
Fukano, T., and T. Furukawa. "Prediction of the effects of liquid viscosity on interfacial shear stress and frictional pressure drop in vertical upward gas-liquid annular flow." International Journal of Multiphase Flow 24, no. 4 (1998): 587-603. https://doi.org/10.1016/S0301-9322(97)00070-0
Furukawa, T., and T. Fukano. "Effects of liquid viscosity on flow patterns in vertical upward gas-liquid two-phase flow." International Journal of Multiphase Flow 27, no. 6 (2001): 1109-1126. https://doi.org/10.1016/S0301-9322(00)00066-5
Matsubara, Hiroaki, and Kiyoshi Naito. "Effect of liquid viscosity on flow patterns of gas-liquid two-phase flow in a horizontal pipe." International Journal of Multiphase Flow 37, no. 10 (2011): 1277-1281. https://doi.org/10.1016/j.ijmultiphaseflow.2011.08.001
McNeil, David A., and Alastair D. Stuart. "The effects of a highly viscous liquid phase on vertically upward two-phase flow in a pipe." International Journal of Multiphase Flow 29, no. 9 (2003): 1523-1549. https://doi.org/10.1016/S0301-9322(03)00122-8
Zhao, Y., H. Yeung, E. E. Zorgani, A. E. Archibong, and L. Lao. "High viscosity effects on characteristics of oil and gas two-phase flow in horizontal pipes." Chemical Engineering Science 95 (2013): 343-352. https://doi.org/10.1016/j.ces.2013.03.004
Sudarja, Sukamta, Deendarlianto, and Indarto. "The Effect of Liquid Viscosity on The Gas-Liquid Two-Phase Flow Pattern in 45° Inclined Capillary Pipe." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 75, no. 1 (2020): 48-57. https://doi.org/10.37934/arfmts.75.1.4857
Sukamta, and Sudarja. "The Significant Effect of Liquid Viscosity on Two-Phase Flow Pressure Gradient in Mini Channel with Slope of 15° against Horizontal." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 70, no. 2 (2020): 116-123. https://doi.org/10.37934/arfmts.70.2.116123
Sukamta, Noviyanto, Sudarja, and Sri Sundari. "Characteristics of Void Fraction Using Image Processing of Two-Phase Flow of Air-Pure Water and Glycerin (40-70%) on A Transparent Mini Pipe with Slope of 45° to the Horizontal." Journal of Advanced Research in Experimental Fluid Mechanics and Heat Transfer 1, no. 1 (2020): 29-37.
Krishnamurthy, Santosh, and Yoav Peles. "Surface tension effects on adiabatic gas-liquid flow across micro pillars." International Journal of Multiphase Flow 35, no. 1 (2009): 55-65. https://doi.org/10.1016/j.ijmultiphaseflow.2008.08.001
Sadatomi, Michio, Akimaro Kawahara, Masatoshi Matsuo, and Katsuhiro Ishimura. "Effects of surface tension on two-phase gas-liquid flows in horizontal small diameter pipes." Journal of Power and Energy Systems 4, no. 2 (2010): 290-300. https://doi.org/10.1299/jpes.4.290
Sukamta, Sukamta. "Computational fluid dynamics (CFD) and experimental study of two-phase flow patterns gas-liquid with low viscosity in a horizontal capillary pipe." CFD Letters 11, no. 8 (2019): 16-23.
Balthazar, Pravinth, and Muzathik Abdul Majeed. "Simulation analysis of two-phase heat transfer characteristics in a smooth horizontal ammonia (R717) evaporator tube." CFD Letters 10, no. 2 (2018): 49-58.
Al-Azawy, Mohammed Ghalib, Saleem Khalefa Kadhim, and Azzam Sabah Hameed. "Newtonian and Non-Newtonian Blood Rheology Inside a Model of Stenosis." CFD Letters 12, no. 11 (2020): 27-36. https://doi.org/10.37934/cfdl.12.11.2736