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Influences of microparticle radius and microchannel height on SSAW-based acoustophoretic aggregation

Dong, Jing, Liang, Dongfang, Yang, Xin and Sun, Chao 2021. Influences of microparticle radius and microchannel height on SSAW-based acoustophoretic aggregation. Ultrasonics 117 , 106547. 10.1016/j.ultras.2021.106547

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The use of acoustic waves for microfluidic aggregation has become widespread in chemistry, biology and medicine. Although numerous experimental and analytical studies have been undertaken to study the acoustophoretic aggregation mechanisms, few studies have been conducted to optimise the device design. This paper presents a numerical investigation of the acoustophoresis of microparticles suspended in compressible liquid. The wall of the rectangular microchannel is made of Polydimethylsiloxane (PDMS), and Standing Surface Acoustic Waves (SSAW) are introduced into the channel from the bottom wall. First, the relative amplitude of the acoustic radiation force and the viscous drag force is evaluated for particles of different radii ranging from 0.1 to 15. Only when the particle size is larger than a critical value can the particles accumulate at acoustic pressure nodes (PNs). The efficiency of the particle accumulation depends on the microchannel height, so an extensive parametric study is then undertaken to identify the optimum microchannel height. The optimum height, when normalised by the acoustic wavelength, is found to be between 0.57 and 0.82. These findings provide insights into the design of acoustophoretic devices.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 0041-624X
Date of First Compliant Deposit: 3 August 2021
Date of Acceptance: 30 July 2021
Last Modified: 09 Aug 2022 18:02

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