Fig. 4: Time response of the streaming velocity under different input voltages.
From: Experimental and numerical study of acoustic streaming in mid-air phased arrays

Input voltages of 5 V (a), 8 V (b), and 10 V (c). The plots show the rise time, fall time, baseline (velocity before Device ON) and mean velocity (velocity during Device ON) measured along the centerline at a focal distance of 80 mm.