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采用耦合水平集--体积分数法(CLSVOF)对液滴撞击倾斜表面液膜后液膜的形态演化及飞溅过程进行数值模拟, 并对液滴撞击液膜过程中形成的空气卷吸现象进行研究并探讨了撞击角对此的影响, 分析了液滴撞击后液体内部的压力和速度分布, 对液滴撞击倾斜表面液膜的飞溅过程进行讨论, 并与实验结果进行了对比, 验证了CLSVOF方法研究液滴撞击倾斜液膜的可行性. 结果表明, 液滴撞击倾斜液膜时前后两部分飞溅现象产生的机理不同, 前半部分飞溅是由于压差引起的颈部射流, 而后半部分则是由液膜径向流动产生的飞溅现象. 随着撞击角的增大, 空气卷吸气泡数量减少.A coupled level set and volume of fluid (CLSVOF) method is utilized to simulate the droplet evolution, during splashing after impacting on an inclined liquid film, and the bubble entrainment by the droplet impacting of the liquid. The influence of impact angles of bubble entrainment, the processes of splashing pressure field and velocity field after impingement are studied and discussed. Compared with the results obtained by experiment, the validity of CLSVOF method is verifiled by simulating the droplet splashing on an inclined liquid film. Results indicate that the mechanisms of front and back splashing are different. The front splashing is caused by pressure difference in the neck region, and the back splashing is produced by radial flow in the liquid film. It is also found that along with the impact angle moving towards the large angle direction, the bubble entrainment number shows a reducing trend.
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Keywords:
- drop impact /
- inclined liquid film /
- CLSVOF /
- bubble entrainment
[1] Gunjal P R, Ranade V V, Chaudhari R V 2005 AIChE Journal 51 365
[2] Eunjeong Kim, Jehyun Baek 2012 Journal of Non-Newtonian Fluid Mechanics 173 62
[3] Guo J H, Dai S Q, Dai Q 2010 Acta Phys.Sin. 59 2601 (in Chinese) [郭加宏, 戴世强, 代钦 2010 物理学报 59 2601]
[4] Rocco G, Coppola G, de. Luca L 2010 Aerotecnica 89 25
[5] Mehdi-Nejad V, Mostaghimi J, Chandra S 2003 Phys. Fluidis 15 173
[6] Guo Y L, Wei L, Shen S Q, Chen G Y 2014 Acta Phys. Sin. 63 094702 (in Chinese) [郭亚丽, 魏兰, 沈胜强, 陈桂影 2014 物理学报 63 094702]
[7] Fujinoto H, Yu Shiotani, Tong A Y 2007 Journal of MultiPhase Flow 33 317
[8] Fujimoto H, Ogino T 2001 International Journal of Multiphase Flow 7 1227
[9] Liang G T, Shen S Q, Guo Y L, Chen J X, Yu Y, Li Y Q 2013 Acta Phys. Sin. 62 084707 (in Chinese) [梁刚涛, 沈胜强, 郭亚丽, 陈觉先, 于欢, 李熠桥 2013 物理学报 62 084707]
[10] Wang Z Y, Yang J M, Koo Bonguk 2009 International Journal of Multiphase Flow 35 227
[11] Tomar G, Biswas G, Sharma A, Agrawal A 2005 Phys. Fluids 17 112103
[12] Liao B, Chen S Q 2013 Periodical of Ocean University of China 43 106 (in Chinese) [廖斌, 陈善群 2013 中国海洋大学学报 43 106]
[13] Brackbill J U, Kothe D B, Zemach C 1992 J. Comput. Phys. 100 335
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[1] Gunjal P R, Ranade V V, Chaudhari R V 2005 AIChE Journal 51 365
[2] Eunjeong Kim, Jehyun Baek 2012 Journal of Non-Newtonian Fluid Mechanics 173 62
[3] Guo J H, Dai S Q, Dai Q 2010 Acta Phys.Sin. 59 2601 (in Chinese) [郭加宏, 戴世强, 代钦 2010 物理学报 59 2601]
[4] Rocco G, Coppola G, de. Luca L 2010 Aerotecnica 89 25
[5] Mehdi-Nejad V, Mostaghimi J, Chandra S 2003 Phys. Fluidis 15 173
[6] Guo Y L, Wei L, Shen S Q, Chen G Y 2014 Acta Phys. Sin. 63 094702 (in Chinese) [郭亚丽, 魏兰, 沈胜强, 陈桂影 2014 物理学报 63 094702]
[7] Fujinoto H, Yu Shiotani, Tong A Y 2007 Journal of MultiPhase Flow 33 317
[8] Fujimoto H, Ogino T 2001 International Journal of Multiphase Flow 7 1227
[9] Liang G T, Shen S Q, Guo Y L, Chen J X, Yu Y, Li Y Q 2013 Acta Phys. Sin. 62 084707 (in Chinese) [梁刚涛, 沈胜强, 郭亚丽, 陈觉先, 于欢, 李熠桥 2013 物理学报 62 084707]
[10] Wang Z Y, Yang J M, Koo Bonguk 2009 International Journal of Multiphase Flow 35 227
[11] Tomar G, Biswas G, Sharma A, Agrawal A 2005 Phys. Fluids 17 112103
[12] Liao B, Chen S Q 2013 Periodical of Ocean University of China 43 106 (in Chinese) [廖斌, 陈善群 2013 中国海洋大学学报 43 106]
[13] Brackbill J U, Kothe D B, Zemach C 1992 J. Comput. Phys. 100 335
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