Fig. 1: This schlieren image shows the impact of a 20-mm-diameter, flat-bottom cylinder on a pool of water as it falls downward with a velocity of ~ 9 m/s. | Nature Communications

Fig. 1: This schlieren image shows the impact of a 20-mm-diameter, flat-bottom cylinder on a pool of water as it falls downward with a velocity of ~ 9 m/s.

From: Cavitation upon low-speed solid–liquid impact

Fig. 1

The impact creates intense compression and tension waves, the gradients of which are shown by the bright and dark striations, that cause the water to cavitate within ~100 μs of initial contact. The red coloring is from the laser lighting.

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