Abstract This work investigates the effect of focused acoustic field on a stream of polydisperse micro water droplets generated by a nebulizer. The acoustic field is induced by a customized axially stepped-thickness piezoelectric circular cylindrical transducer. Exposure of the droplets to the acoustic field while passing through the transducer improves the relative movement between the air and droplets, which results in an enhanced heat transfer and facilitates evaporation. Larger droplets in the stream are affected more than small ones by the acoustic field. A noticeable reduction in the size of 90% of droplets has been observed. This improves and narrows the droplet size distribution in the stream, which is of practical importance for some drug delivery applications or humidification in lung supportive devices.

中文翻译：

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微水滴多分散流的声学增强蒸发

摘要 这项工作研究了聚焦声场对雾化器产生的多分散微水滴流的影响。声场由定制的轴向阶梯厚度压电圆柱换能器引起。液滴在通过换能器时暴露在声场中会改善空气和液滴之间的相对运动，从而增强传热并促进蒸发。流中较大的液滴比小液滴受到声场的影响更大。已经观察到 90% 的液滴尺寸显着减小。这改善并缩小了液流中的液滴尺寸分布，这对于某些药物输送应用或肺部支持装置中的增湿具有实际重要性。