超声对称平面内微粒子图像测速仪测量声辐射和流致微粒速度
Acoustic radiation- and streaming-induced microparticle velocities determined by micro-PIV in an ultrasound symmetry plane
摘要：
我们提出了微PIV测量的悬浮微粒的直径从0.6 μ m到10 μ m进行声泳在超声对称平面中的微通道。最小颗粒的运动主要由诱导声流的Stokes阻力控制，而最大颗粒的运动主要由声辐射力控制。对于所有的颗粒尺寸，我们预测理论上有多少粒子的速度是由于辐射和流，分别。这些预测包括粒子壁相互作用和超声波热粘性效应的修正，它们在实验不确定性范围内与我们的测量结果相匹配。最后，我们从理论上预测和实验证实，声辐射和流诱导的颗粒速度之间的比率是成正比的颗粒尺寸，驱动频率和声对比度因子的平方，而它是成反比的运动粘度。
英文摘要：
We present micro-PIV measurements of suspended microparticles of diameters from 0.6 um to 10 um undergoing acoustophoresis in an ultrasound symmetry plane in a microchannel. The motion of the smallest particles are dominated by the Stokes drag from the induced acoustic streaming flow, while the motion of the largest particles are dominated by the acoustic radiation force. For all particle sizes we predict theoretically how much of the particle velocity is due to radiation and streaming, respectively. These predictions include corrections for particle-wall interactions and ultrasonic thermoviscous effects, and they match our measurements within the experimental uncertainty. Finally, we predict theoretically and confirm experimentally that the ratio between the acoustic radiation- and streaming-induced particle velocities is proportional to the square of the particle size, the actuation frequency and the acoustic contrast factor, while it is inversely proportional to the kinematic viscosity.
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