Numerical Simulation of Head-on Binary Collision Between Seawater Droplets

YIN Qiang; QI Xiaoni; LIANG Wei

doi:10.21656/1000-0887.400196

Volume 41 Issue 3

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YIN Qiang, QI Xiaoni, LIANG Wei. Numerical Simulation of Head-on Binary Collision Between Seawater Droplets[J]. Applied Mathematics and Mechanics, 2020, 41(3): 268-279. doi: 10.21656/1000-0887.400196

Citation:

YIN Qiang, QI Xiaoni, LIANG Wei. Numerical Simulation of Head-on Binary Collision Between Seawater Droplets[J]. Applied Mathematics and Mechanics, 2020, 41(3): 268-279. doi: 10.21656/1000-0887.400196

Citation:

YIN Qiang, QI Xiaoni, LIANG Wei. Numerical Simulation of Head-on Binary Collision Between Seawater Droplets[J]. Applied Mathematics and Mechanics, 2020, 41(3): 268-279. doi: 10.21656/1000-0887.400196

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Numerical Simulation of Head-on Binary Collision Between Seawater Droplets

doi: 10.21656/1000-0887.400196

School of Transportation and Vehicle Engineering, Shandong University of Technology,Zibo, Shandong 255049, P.R.China

Funds: The National Natural Science Foundation of China（51879154）

Received Date: 2019-06-21
Rev Recd Date: 2020-01-08
Publish Date: 2020-03-01

Abstract

Abstract

Numerical simulations of head-on binary collisions between equal-size seawater droplets were conducted with the volume of fluid (VOF) method and the adaptive grid technique, to investigate the collision physics and mechanics of seawater droplets in shower cooling towers. Trial simulations of head-on collisions of tetradecane droplets in nitrogen medium were performed firstly to give results in good agreement with those of the previous experiments. The binary collisions of equal-size seawater droplets were simulated under room temperature and normal pressure conditions. The stream field and flow mechanism of seawater droplets collision were analyzed, and the effects of droplet diameters and concentrations on the collision process were studied. Two different types of collision outcomes were identified: the coalescence and the reflexive separation, for which the critical Weber numbers were given. The schematic diagrams for various head-on collision regimes of seawater droplets at various Ohnesorge numbers were also obtained.
- seawater,
- droplet collision,
- VOF,
- adaptive grid technique

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References(21)

References

[1]	齐晓霓. 无填料冷却塔的理论与实验研究[D]. 博士学位论文. 上海: 上海交通大学, 2008.(QI Xiaoni. Research on the shower cooling tower[D]. PhD Thesis. Shanghai: Shanghai Jiao Tong University, 2008.(in Chinese))
[2]	KOLLAR L E, FARZANEH M, KAREV A R. Modeling droplet collision and coalescence in an icing wind tunnel and the influence of these processes on droplet size distribution[J]. International Journal of Multiphase Flow,2005,31(1): 69-92.
[3]	PARK J Y, BLAIR L M. The effect of coalescence on drop size distribution in an agitated liquid-liquid dispersion[J]. Chemical Engineering Science,1975,30(9): 1057-1064.
[4]	FAETH G M. Current status of droplet and liquid combustion[J]. Progress in Energy and Combustion Science,1977,3(4): 191-224.
[5]	ADAM J R, LINDBLAD N R, HENDRICKS C D. The collision, coalescence, and disruption of water droplets[J]. Journal of Applied Physics,1968,39(11): 5173-5180.
[6]	QIAN J, LAW C K. Regimes of coalescence and separation in droplet collision[J]. Journal of Fluid Mechanics,1997,〖STHZ〗 331(1): 59-80.
[7]	BRAZIER-SMITH P R, JENNINGS S G, LATHAM J. The interaction of falling water drops: coalescence[J]. Proceedings of the Royal Society of London,1972,326(1566): 393-408.
[8]	NIKOLOPOULOS N, NIKAS K S, BERGELES G. A numerical investigation of central binary collision of droplets[J]. Computers & Fluids,2009,38(6): 1191-1202.
[9]	NIKOLOPOULOS N, THEODORAKAKOS A, BERGELES G. Off-centre binary collision of droplets: a numerical investigation[J]. International Journal of Heat and Mass Transfer,2009,52(19/20): 4160-4174.
[10]	NIKOLOPOULOS N, BERGELES G. The effect of gas and liquid properties and droplet size ratio on the central collision between two unequal-size droplets in the reflexive regime[J]. International Journal of Heat and Mass Transfer,2011,54(1/3): 678-691.
[11]	NIKOLOPOULOS N, STROTOS G, NIKAS K S, et al. The effect of Weber number on the central binary collision outcome between unequal-sized droplets[J]. International Journal of Heat and Mass Transfer,2012,55(7/8): 2137-2150.
[12]	夏盛勇, 胡春波. 三氧化二铝液滴对心碰撞直接数值模拟[J]. 应用数学和力学, 2014,35(4): 377-388.(XIA Shengyong, HU Chunbo. Direct numerical simulation of head-on binary collision of aluminum oxide droplets[J]. Applied Mathematics and Mechanics,2014,35(4): 377-388.(in Chinese))
[13]	梁伟, 齐晓霓, 尹强, 等. 气体介质中海水液滴碰撞过程数值模拟[J]. 应用数学和力学, 2018,39(11): 1236-1245.(LIANG Wei, QI Xiaoni, YIN Qiang, et al. Numerical simulation of seawater droplets collision in gaseous environment[J]. Applied Mathematics and Mechanics,2018,39(11): 1236-1245.(in Chinese))
[14]	ASHGRIZ N, POO J Y. Coalescence and separation in binary collisions of liquid drops[J]. Journal of Fluid Mechanics,1990,221(221): 183-204.
[15]	BRENN G, KOLOBARIC V. Satellite droplet formation by unstable binary drop collisions[J]. Physics of Fluids,2006,18(8): 087101.
[16]	PLANCHETTE C, LORENCEAU E, BRENN G. The onset of fragmentation in binary liquid drop collisions[J]. Journal of Fluid Mechanics,2012,702: 5-25.
[17]	ZHANG P, LAW C K. An analysis of head-on droplet collision with large deformation in gaseous medium[J]. Physics of Fluids,2011,23(4): 042102.
[18]	TANG C L, ZHANG P, LAW C K. Bouncing, coalescence, and separation in head-on collision of unequal-sized droplets[J]. Physics of Fluids,2012,24(2): 022101.
[19]	LIU D, ZHANG P, LAW C K, et al. Collision dynamics and mixing of unequal-size droplets[J]. International Journal of Heat and Mass Transfer,2013,57(1): 421-428.
[20]	ORME M. Experiments on droplet collisions, bounce, coalescence and disruption[J]. Progress in Energy & Combustion Science,1997,23(1): 65-79.
[21]	WILLIS K D, ORME M. Binary droplet collisions in a vacuum environment: an experimental investigation of the role of viscosity[J]. Experiments in Fluids,2003,34(1): 28-41.