Numerical Study on Bouncing and Separation Collision Between Two Droplets Considering the Collision-Induced Breakup

Gwon Hyun Ko; Hong Sun Ryou; Nahm Keon Hur; Seung Woo Ko; Myoung O Youn

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자료유형: 학술저널

저자정보: Gwon Hyun Ko Hong Sun Ryou Nahm Keon Hur Seung Woo Ko Myoung O Youn

저널정보: 대한기계학회 Journal of Mechanical Science and Technology Journal of Mechanical Science and Technology Vol.21 No.4

발행연도: 2007.4

수록면: 585 - 592 (8page)

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The main purpose of the present study is to perform numerical study on bouncing and separation collision between two droplets considering the collision-induced breakup. In this study, the collision model proposed in our previous study is used for simulation of collision-induced breakup, and we modify this model to consider the effect of liquid property on the behavior of droplet-droplet collision. This collision model is based on the conservation laws for mass, momentum, and energy between before and after collision and provides several formulae for post-collision characteristics of colliding droplets and satellite droplets. Improving the accuracy of the model, in this study, appreciate criterion for bouncing collision is added and dissipation energy during collision process is newly modeled. To validate the new model, numerical calculations are performed and their results are compared with experimental data published earlier for binary collisions of water, propanol, and tetradecane droplets. It is found from the results that the new model shows good agreement with experimental data for the number of satellite droplets. It can be also shown that the predicted mean diameter by the new model decrease with increasing the Weber number because of the collisioninduced breakup, whereas the O’Rourke model fails to predict the size reduction via the binary droplet collision.

#Collision #Break up #Bouncing #Separation

참고문헌 (10)

참고문헌 신청

Arai, M., Saito, M., 1999, "Atomization Characteristics of Jet-to-Jet and Spray-to-Spray Impingement Systems," Atomization and Sprays, Vol. 9, pp. 399~417.

Ashgriz, N., Poo, J. Y., 1990, "Coalescence and Separation in Binary Collisions of Liquid Drops," Journal of Fluid Mechanics, Vol. 221, pp. 183~204.

Bai, C., 1996, Modeling of Spray Impingement Processes, Ph.D. thesis, Imperial College of Science and Technology and Medicine, Department of Mechanical Engineering, University of London.

Brazier-Smith, P. R., Jennings, S. G., Latham, J., 1972, "The Interaction of Falling Water Droplets: Coalescence," Proc. of the Royal Society of London A, Vol. 326, pp. 393~408.

Brenn, G., Valkovska, D., Danov, K. D., 2001, "The Formation of Satellite Droplets by Unstable Binary Drop Collisions," Physics of Fluids, Vol. 13, pp. 2463~2477.

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