Experimental Investigation of Binary Supercooled
 Water Droplet Collision

doi:10.16183/j.cnki.jsjtu.2017.08.007

Abstract

Abstract: The prediction of droplet size distribution is always based on water droplet collision outcome at room temperature, which has a great difference with that in freezing environment. Because of this, the outcome of binary water droplet collisions was investigated experimentally within a certain temperature range. Two monodisperse droplet chains were produced by means of piezoelectric droplet generators and two high speedcameras were used to observe the collision process. Values of the Weber number based on the small droplet sizes are from 0 to 100. Droplet temperature varies from 25℃ to －5℃. Compared with the outcome at room temperature, the result of the supercooled water droplet collision has obviously changed. ① The coalescence region extends to the separation region. ② The reflexive separation region move towards the region with high Weber number value. ③ The stretching separation region is slightly shifted downward. From the perspective of the supercooled water properties, the influence of temperature on collision results was discussed. The droplet size distribution of supercooled spray has a great difference with the result based on water droplet collision at room temperature.

Key words: temperature, binary water droplet collision, impact parameters, viscosity, surface tension

CLC Number:

V 21

YIN Jinge1，KONG Weiliang1，WANG Fuxin1， LIU Hong1，YANG Kun2. Experimental Investigation of Binary Supercooled
Water Droplet Collision [J]. Journal of Shanghai Jiaotong University, 2017, 51(8): 939-945.

References

［1］VAN ZANTE J F, IDE R F, STEEN L E, et al. NASA Glenn icing research tunnel: 2012 cloud calibration procedure and results［C］∥4th AIAA Atmospheric and Space Environments Conference. New Orleans: AIAA, 2012: 2933.
［2］THOMPSON G, POLITOVICH M. A numerical weather model’s ability to predict aircraft and ground icing environments［C］∥6th AIAA Atmospheric and Space Environments Conference. Atlanta: AIAA, 2014: 2066.
［3］KOLLR L E, FARZANEH M, KAREV A R. The role of droplet collision, evaporation and gravitational settling in the modeling of twophase flows under icing conditions［C］∥Proceeding of 11th International Workshop on Atmospheric Icing of Structures. Montréal: IWAIS XI, 2005.
［4］BORD S R, HAGEMEIER T, THVENIN D. Experimental investigation of dropletdroplet interactions［C］∥23rd European Conference on Liquid Atomization and Spray Systems. Berlin: Freie Universitt, 2010: 198.1198.6.
［5］Department of Transportation, Federal Aviation Administration. Federal register: Part III［R］. Washington: Federal Aviation Administration, 2014.
［6］BRAZIERSMITH P R, JENNINGS S G, LATHAM J. The interaction of falling water drops: Coalescence［C］∥Proceedings of the Royal Society of London A: Mathematical, Physical and Engineering Sciences. London: The Royal Society, 1972: 393408.
［7］GOTAAS C, HAVELKA P, JAKOBSEN H A, et al. Effect of viscosity on dropletdroplet collision outcome: Experimental study and numerical comparison［J］. Physics of Fluids, 2007, 19(10): 102106.
［8］ASHGRIZ N, POO J Y. Coalescence and separation in binary collisions of liquid drops［J］. Journal of Fluid Mechanics, 1990, 221: 183204.
［9］ESTRADE J P, CARENTZ H, LAVERGNE G, et al. Experimental investigation of dynamic binary collision of ethanol droplets—A model for droplet coalescence and bouncing［J］. International Journal of Heat and Fluid Flow, 1999, 20(5): 486491.
［10］BRENN G, VALKOVSKA D, DANOV K D. The formation of satellite droplets by unstable binary drop collisions［J］. Physics of Fluids, 2001, 13(9): 24632477.
［11］O’ROURKE P J, BRACCO F V. Modeling of drop interactions in thick sprays and a comparison with experiments［J］. Proceedings of the Institution of Mechanical Engineers, 1980, 9: 101106.
［12］KO G H, RYOU H S. Droplet collision processes in an interspray impingement system［J］. Journal of Aerosol Science, 2005, 36(11): 13001321.
［13］BUTTERSACK T, BAUERECKER S. Critical radius of supercooled water droplets: On the transition toward dendritic freezing［J］. The Journal of Physical Chemistry B, 2016, 120(3): 504512.
［14］JIANG Y J, UMEMURA A, LAW C K. An experimental investigation on the collision behaviour of hydrocarbon droplets［J］. Journal of Fluid Mechanics, 1992, 234: 171190.
［15］YI N, HUANG B, DONG L, et al. Temperatureinduced coalescence of colliding binary droplets on superhydrophobic surface［J］. Scientific Reports, 2014, 4: 4303.
［16］QIAN J, LAW C K. Regimes of coalescence and separation in droplet collision［J］. Journal of Fluid Mechanics, 1997, 331: 5980.
［17］RABE C, MALET J, FEUILLEBOIS F. Experimental investigation of water droplet binary collisions and description of outcomes with a symmetric Weber number［J］. Physics of Fluids, 2010, 22(4): 047101.
［18］KUSCHEL M, SOMMERFELD M. Investigation of droplet collisions for solutions with different solids content［J］. Experiments in Fluids, 2013, 54(2): 117.
［19］HALLETT J. The temperature dependence of the viscosity of supercooled water［J］. Proceedings of the Physical Society, 1963, 82(6): 1046.
［20］VARGAFTIK N B, VOLKOV B N, VOLJAK L D. International tables of the surface tension of water［J］. Journal of Physical and Chemical Reference Data, 1983, 12(3): 817820.
［21］PLANCHETTE C, LORENCEAU E, BRENN G. The onset of fragmentation in binary liquid drop collisions［J］. Journal of Fluid Mechanics, 2012, 702: 525.

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