TY - JOUR
T1 - Frequency effects on microparticle motion in horizontally actuated open rectangular chambers
AU - Agrawal, Prashant
AU - Gandhi, Prasanna S.
AU - Neild, Adrian
N1 - Research funded by Australian Research Council (DP110104010)
PY - 2015/11/1
Y1 - 2015/11/1
N2 - The motion of a particle in a liquid subjected to periodic vibrations is determined by its interaction with the periodic (in time) and spatially varying first-order flow field and the ensuing second-order field. The dominating force either allows the particle to collect in stable locations or remain dispersed in the liquid bulk. In this work, we investigate the characteristics of a microparticle’s response to these first- and second-order effects across frequencies ranging from 100 Hz to 100 MHz. The movement of sedimented particles is analyzed through the simulation of capillary wave fields and acoustic wave fields in a horizontally actuated open rectangular chamber. The changing effect of the first-order field on the particle’s motion, from being the dominant mechanism at low frequencies to being ineffective at the higher frequencies, is demonstrated by considering time-averaged forces acting on the particle, over a cycle. Further, the time-averaged effects of the second-order field, termed as streaming field, are analyzed in both capillary-wave- and acoustic-wave-based collection mechanisms; this analysis provides valuable information regarding the minimum particle size that can be collected in a chamber, through the respective mechanisms. Intriguingly, it is observed that the collection of nanometer-sized particles requires excitation at either end of the frequency spectrum.
AB - The motion of a particle in a liquid subjected to periodic vibrations is determined by its interaction with the periodic (in time) and spatially varying first-order flow field and the ensuing second-order field. The dominating force either allows the particle to collect in stable locations or remain dispersed in the liquid bulk. In this work, we investigate the characteristics of a microparticle’s response to these first- and second-order effects across frequencies ranging from 100 Hz to 100 MHz. The movement of sedimented particles is analyzed through the simulation of capillary wave fields and acoustic wave fields in a horizontally actuated open rectangular chamber. The changing effect of the first-order field on the particle’s motion, from being the dominant mechanism at low frequencies to being ineffective at the higher frequencies, is demonstrated by considering time-averaged forces acting on the particle, over a cycle. Further, the time-averaged effects of the second-order field, termed as streaming field, are analyzed in both capillary-wave- and acoustic-wave-based collection mechanisms; this analysis provides valuable information regarding the minimum particle size that can be collected in a chamber, through the respective mechanisms. Intriguingly, it is observed that the collection of nanometer-sized particles requires excitation at either end of the frequency spectrum.
KW - Acoustic streaming
KW - Acoustic wave
KW - Capillary wave
KW - Microparticle manipulation
UR - http://www.scopus.com/inward/record.url?scp=84945465779&partnerID=8YFLogxK
U2 - 10.1007/s10404-015-1640-y
DO - 10.1007/s10404-015-1640-y
M3 - Article
AN - SCOPUS:84945465779
VL - 19
SP - 1209
EP - 1219
JO - Microfluidics and Nanofluidics
JF - Microfluidics and Nanofluidics
SN - 1613-4982
IS - 5
ER -