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Title

SIMULATION OF DROPLET IMPACT ON A THIN LIQUID FILM USING THE PSEUDOPOTENTIAL MULTIPHASE MODEL

Pages

 Start Page 8 | End Page 16

Abstract

 In this research, the use of the exact difference method forcing scheme in the PSEUDO-POTENTIAL MULTIPHASE model is suggested for the simulation of a DROPLET IMPACT on a thin liquid film at a density ratio of 1000, and the effect of inertia, surface tension, and gravity forces are considered by means of their corresponding non-dimensional numbers (i.e. the Reynolds, Weber, and Bond numbers). For this reason, the Palabos open source software is modified by implementing the exact difference method in it. The results of our simulations in different Reynolds and Weber numbers show that the Weber number has a slight influence on the CROWN LAYER radius, meanwhile, the Reynolds number has a direct effect on the crown radius. The crown height is increased with an increase in the Reynolds and Weber numbers. Furthermore, the comparison between the pseudopotential model simulations and the free-energy model show that the crown shape is related to the surface tension; in addition to the non- dimensional numbers and with a noticeable increase in surface tension the crown tip becomes bigger. The influence of the gravity force is investigated through the Bond number. According to the results, the crown height is noticeably affected by the Bond number. When the Bond number decreases, the crown radius and height increase. Therefore, the proposed model with the potential of being used for MULTIPHASE problems with large density ratios while producing a low spurious current could be utilized for a wide variety of other MULTIPHASE problems as well.

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