Extended Data Fig. 3: Measurement of microstreaming velocity by PIV.
a, Microstreaming generated by a 4×4 80 μm × 150 μm microbubble array under an excitation frequency of 27.6 kHz and two different voltages of 10 VPP (left panel) and 30 VPP (right panel). The black dashed line denotes the measurement position of the microstreaming velocity, which is 80 μm away from the surface. b, Plot of microstreaming velocity versus ultrasound excitation voltage respectively measured by 4×4 microbubble arrays with three different sizes (40 μm, 60 μm, and 80 μm). The solid lines are the quadratic fitting results. The shaded error bands represent mean ± s.d. from n = 5 independent measurements.
