EFFECT OF SURFACE TENSION ON SPLASHES OF A LIQUID DURING DROP FALLING ON A RIGID OBSTACLE

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Abstract

The impacts of water and ethyl alcohol drops on a small metal disk whose diameter (4 mm) is only slightly greater than the drop diameter (2.8 mm) are studied. The drops fell from a height of 0.10–0.65 m and reached a velocity of 1.40–3.57 m/s before impact. Using high-speed video recording, various stages of the drop collisions with the obstacle were recorded. It is found that when going over from water to ethyl alcohol under the same impact conditions, a noticeable increase in the maximum splash diameter and the time it takes to reach it is observed. Observations also show that transition from a continuous splash to a splash with fragmentation is determined exclusively by the impact Weber number, whose critical value is of the order of 100. The previously established power-law dependence of the maximum splash diameter on the impact Weber number is confirmed.

About the authors

A. V Bazilevskii

Ishlinsky Institute for Problems in Mechanics, Russian Academy of Sciences

Email: baz@ipmnet.ru
Moscow, Russia

A. N Rozhkov

Ishlinsky Institute for Problems in Mechanics, Russian Academy of Sciences

Email: rozhkov@ipmnet.ru
Moscow, Russia

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