CONCENTRATION AND FRACTIONATION OF SMALL PARTICLES IN LIQUID BY ULTRASOUND
CONCENTRATION AND FRACTIONATION OF SMALL PARTICLES IN LIQUID BY ULTRASOUND
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DOI：
10.1143/jjap.34.2715
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发表时间：
1995-05-01
期刊：
影响因子：
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通讯作者：
TAKEDA, K
中科院分区：
文献类型：
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作者：
YASUDA, K;UMEMURA, S;TAKEDA, K
从理论上分析了超声平面驻波对小颗粒的浓缩效果，并与实验结果进行了比较。通过测量超声吸收来估计声能密度，并通过暗视野显微镜观察颗粒分布。该理论预测，当直径大于5 μ m的聚苯乙烯微球受到2 J/m（3）的超声波时，其扩散可以忽略不计。对于1 μ m和2 μ m直径的颗粒，稳态颗粒分布的半宽与理论值具有相同的数量级。我们还将这种浓缩技术应用于直径为10 μ m的聚苯乙烯球的分级，并成功地收集了层流中90%以上的颗粒。
The efficacy of the ultrasonic standing plane wave in concentrating small particles was theoretically evaluated and compared with experimental results. Acoustic energy density was estimated by measuring the ultrasonic absorption, and particle distribution was observed by dark-field microscopy. The theory predicts that diffusion is negligible in concentrating polystyrene spheres larger than 5 mu m in diameter when they are subjected to 2J/m(3) ultrasound. The half-width of the steady-state particle distribution was of the same order of magnitude as the theoretical value for the particles of 1 mu m and 2 mu m diameter. We also applied this concentrating technique to fractionation of polystyrene spheres 10 mu m in diameter, and more than 90% of the particles in the laminar flow were successfully collected.