Abstract
Numerical simulations of head-on binary collisions between equal-size seawater droplets were conducted with the volume of fluid (VOF) method and the adaptive grid technique, to investigate the collision physics and mechanics of seawater droplets in shower cooling towers. Trial simulations of head-on collisions of tetradecane droplets in nitrogen medium were performed firstly to give results in good agreement with those of the previous experiments. The binary collisions of equal-size seawater droplets were simulated under room temperature and normal pressure conditions. The stream field and flow mechanism of seawater droplets collision were analyzed, and the effects of droplet diameters and concentrations on the collision process were studied. Two different types of collision outcomes were identified: the coalescence and the reflexive separation, for which the critical Weber numbers were given. The schematic diagrams for various head-on collision regimes of seawater droplets at various Ohnesorge numbers were also obtained.
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