Detailed numerical simulations of unequal sized off-centre binary droplet collisions

Chowdhary, Sarwasva and Reddy, S. Rajesh and Banerjee, Raja (2020) Detailed numerical simulations of unequal sized off-centre binary droplet collisions. International Journal of Multiphase Flow, 128 (103267). ISSN 03019322

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A numerical investigation of the binary collision of two off-center unequal sized liquid droplets in the gaseous environment has been performed. The complete process of collision of droplets is dynamically simulated by solving the incompressible Navier–Stokes equations. Simulations are performed using three-dimensional, multiphase finite volume based solver in OpenFOAM platform. The gas-liquid interface is captured by using the volume of fluid (VOF) method. The solver is appropriately validated and is applied to study the effect of the droplet diameter ratio and the impact parameter on the droplet collision characteristics. The numerical study is done by fixing a moderately high Weber number and Reynolds number for unequal sized droplet collision, where stretching separation is expected as a collision outcome for equal sized droplets. The geometrical characteristics of ligament structures are presented both qualitatively and quantitatively. The satellite droplet formation is also well captured with the present simulations. Post-collision characteristics from the simulations are compared with an existing collision model. It is believed that the present study serves as a first step towards the development of a more accurate droplet collision models.

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IITH Creators:
IITH CreatorsORCiD
Banerjee, Raja
Item Type: Article
Uncontrolled Keywords: Droplet collision, Droplet size ratio, Impact parameter, Volume of fluid model
Subjects: Physics > Mechanical and aerospace
Physics > Mechanical and aerospace > Transportation Science & Technology
Physics > Pneumatics
Physics > Sound, light and Heat
Physics > Electricity and electronics
Physics > Modern physics
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 28 May 2021 05:49
Last Modified: 28 May 2021 05:49
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