Yang In-Hwan, Kim Nahae
Department of Chemical Engineering, Kyonggi University, Suwon-si 16227, Republic of Korea.
Department of Chemical Engineering, Kyonggi University, Suwon-si 16227, Republic of Korea.
Ultrasonics. 2024 Mar;138:107267. doi: 10.1016/j.ultras.2024.107267. Epub 2024 Feb 13.
Ultrasonic standing waves with specific wavelengths generated in the multi-layered micro-resonators were numerically and experimentally analyzed. Using a three-dimensional scanning fluorescence microscope, the acoustophoretic motion of fluorescent microparticles within the micro-resonators was carefully and accurately measured. The manufactured micro-resonators were validated by comparing the location of the acoustic pressure nodal plane and the average energy density curves derived from numerical and experimental results. Results confirmed that the acoustic radiation force of the induced ultrasonic standing waves drives the microparticles vertically within the micro-resonators and their average energy density increases as the sinusoidal voltage applied to the piezoelectric transducer increases. Semi-empirical correlations were developed for the average energy density, based on experimental results for a wide range of the applied voltage amplitudes. The correlations were in good agreement, within less than 20 % of the experimental values measured for both the half-wavelength and quarter-wavelength micro-resonators.
对多层微谐振器中产生的特定波长的超声驻波进行了数值和实验分析。使用三维扫描荧光显微镜，仔细且准确地测量了微谐振器内荧光微粒的声泳运动。通过比较声压节面的位置以及从数值和实验结果得出的平均能量密度曲线，对制造的微谐振器进行了验证。结果证实，所诱导的超声驻波的声辐射力在微谐振器内垂直驱动微粒，并且随着施加到压电换能器的正弦电压增加，其平均能量密度也会增加。基于广泛的施加电压幅度的实验结果，建立了平均能量密度的半经验关联式。对于半波长和四分之一波长微谐振器测量的实验值，这些关联式的误差在20%以内，吻合度良好。
