Abstract Airborne particulate matter (PM) has emerged as an important global environmental and social issue due to its harmful health effects. Various techniques have been introduced to remove indoor PM. However, an effective and sustainable method has not been established yet because of complex mechanisms and various factors. Here, we propose the use of water microdroplets generated by a MHz-frequency ultrasound, and experimentally examine the effects of the generated microdroplets on PM removal. The PM removal efficiency and PM deposition constant are analyzed by measuring the temporal variation of PM concentration. The measured experimental results are compared with analytical deposition constants. Two collection efficiencies derived in previous studies are employed to substitute a mathematical model used for determining the analytical deposition constants. In addition, the mean diameter and the moving velocity of the microdroplets are experimentally measured via a digital holographic microscopy and particle image velocimetry generated by a MHz-frequency atomizer. The present results demonstrate that water microdroplets generated by the atomizer can be effectively used to remove PM.

中文翻译：

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使用MHz频率超声雾化器产生的水微滴有效去除室内颗粒物

摘要 空气中颗粒物 (PM) 因其对健康的有害影响已成为一个重要的全球环境和社会问题。已经引入了各种技术来去除室内 PM。然而，由于机制复杂、因素多方面的原因，目前尚未建立起一种有效且可持续的方法。在这里，我们建议使用由 MHz 频率超声产生的水微滴，并通过实验检查产生的微滴对 PM 去除的影响。通过测量 PM 浓度的时间变化来分析 PM 去除效率和 PM 沉积常数。将测量的实验结果与分析沉积常数进行比较。以前研究中得出的两种收集效率被用来代替用于确定分析沉积常数的数学模型。此外，微滴的平均直径和移动速度通过数字全息显微镜和由 MHz 频率雾化器产生的粒子图像测速进行实验测量。目前的结果表明，雾化器产生的水微滴可以有效地用于去除 PM。