Acoustofluidic Patterning inside Capillary Tubes Using Standing Surface Acoustic Waves

Maramizonouz, Sadaf, Jia, Changfeng, Rahmati, Mohammad, Liu, Qiang, Torun, Hamdi, Wu, Qiang and Fu, Yong Qing (2022) Acoustofluidic Patterning inside Capillary Tubes Using Standing Surface Acoustic Waves. International Journal of Mechanical Sciences, 214. p. 106893. ISSN 0020-7403

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Acoustofluidic platform has great potentials to integrate capillary tubes for controlling and manipulating microparticles and biological cells in both non-flowing and continuous-flow settings. In order to effectively manipulate microparticles/cells inside capillary tubes, it is essential to fully understand and control the patterns generated inside the capillary tubes with different cross-sections, and to investigate the influences of configuration and position arrangement of electrodes along with the capillary tubes. This paper aims to systematically investigate the patterning and alignment of microparticles inside glass capillary tubes using thin film surface acoustic wave (SAW) devices. Through both experimental studies and numerical modelling, effects of various cross-section geometries of the capillary tubes and their positioning with respect to the direction of interdigital transducers (IDTs) of the SAW device in both a stationary fluid and a continuous flow fluid were studied. Results showed that for the rectangular glass capillary tubes, the patterned lines of particles are parallel to the tube’s side walls, irrelevant to the tube positions along with the IDTs, which is mainly caused by the standing wave field generated inside the rectangular glass tube. Whereas for the circular glass capillary tubes, alignment patterns of particles are quite different along the tube’s height. At the bottom of the circular tube, particles are patterned into lines parallel to the tube direction, because the acoustic waves propagate into the water and form a standing wave along the direction of the circular tube. Whereas at the middle height of the tube, the particles are patterned into lines perpendicular to the tube direction, because the formed standing waves also propagate around the circular cross-section of the tube and are perpendicular to the tube direction. For the cases with a continuous liquid flow, under the agitation of acoustic waves, particles are patterned in lines parallel to the flow directions for both the rectangular and circular glass tubes, and the fluid flow enhances and smoothens the patterned lines of the particles.

Item Type: Article
Additional Information: Funding information: This work was supported by the Engineering and Physical Sciences Research Council of UK (EPSRC EP/P018998/1), UK Fluidic Network Special Interest Group of Acoustofluidics (EP/N032861/1), International Exchange Grant (IEC/NSFC/201078) through Royal Society and the National Natural Science Foundation of China, and EPSRC NetworkPlus in Digitalised Surface Manufacturing (EP/S036180/1).
Uncontrolled Keywords: Acoustic Manipulation, Capillary Tubes, Particle Patterning, Acoustofluidics, Numerical Simulation, Thin Film SAW Devices
Subjects: H300 Mechanical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Elena Carlaw
Date Deposited: 25 Oct 2021 14:22
Last Modified: 30 Nov 2021 12:45

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