Liu Pengzhan, Zhang Xin, Liu Guicai, Hao Lim Shi, Pun Wan Man, Lisak Grzegorz, Feng Ng Bing
Energy Research Institute @ NTU, Nanyang Technological University, Singapore 639141, Singapore; School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore.
Energy Research Institute @ NTU, Nanyang Technological University, Singapore 639141, Singapore.
Ultrason Sonochem. 2024 Feb;103:106774. doi: 10.1016/j.ultsonch.2024.106774. Epub 2024 Jan 20.
Acoustic agglomeration is a technique that leverages on sound waves to promote the collision of aerosol particulate matter, thus leading to the formation of larger particle agglomerates. In this study, this acoustics-driven phenomenon is demonstrated for its usefulness as an aerosol pre-conditioning method to significantly enhance the efficiency of filtration systems in particle treatment processes. Specifically, favorable changes in pressure drop across the filters are observed as a result of receiving less particle mass, for which filters are shown to be able to have their operational life extended remarkably by more than 50%. The involved ultrasonic aerosol agglomeration mechanisms are unveiled through numerical simulations, and the effects of residence time, sound pressure level, and initial particle number concentration on agglomeration performances are experimentally investigated. In addition, validations and measurements of filter pressure drop are obtained through a series of experiments. This study provides a comprehensive overview to the design and performance characterization of acoustics-agglomeration-enhanced filtration systems, which could potentially derive energy savings for fan power in ventilation systems and be scaled up for applications in industrial plants for reducing carbon emissions.
声团聚是一种利用声波促进气溶胶颗粒物碰撞，从而导致形成更大颗粒团聚物的技术。在本研究中，这种由声学驱动的现象被证明作为一种气溶胶预处理方法，在显著提高颗粒处理过程中过滤系统的效率方面是有用的。具体而言，由于颗粒质量减少，观察到过滤器两端的压降发生了有利变化，结果表明过滤器的使用寿命能够显著延长超过50%。通过数值模拟揭示了相关的超声气溶胶团聚机制，并通过实验研究了停留时间、声压级和初始颗粒数浓度对团聚性能的影响。此外，通过一系列实验获得了过滤器压降的验证和测量结果。本研究全面概述了声学团聚增强过滤系统的设计和性能表征，这有可能在通风系统中节省风扇功率的能源，并扩大规模应用于工业工厂以减少碳排放。
