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Experimental study of collisions of differently sized droplets

Collisions of uncharged water droplets with a flat water surface were experimentally studied. These experiments simulate the processes that take place during formation of mists and clouds of any type. The collision parameters were measured in the following ranges: droplet radius r = 75-150 μm, droplet velocity V = 0.4-1.1 m s -1 , and collision angle α = 10°-90°. The results are plotted as dependences of the coalescence coefficient E, (partial coalescence coefficient E p ) on the collision angle α for different velocities V and droplet radii r. For droplets with radii r = 100 and 125 μm, the surfaces representing the dependence of the coalescence coefficient E s on the collision angle α and velocity V are constructed. The results of this work are a generalization of the data of previous experimental studies.