Relocation of coflowing immiscible liquids under acoustic field in a microchannel

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Relocation of coflowing immiscible liquids under acoustic field in a microchannel. / Hemachandran, E.; Karthick, S.; Laurell, T.; Sen, A. K.

In: EPL, Vol. 125, No. 5, 54002, 15.04.2019.

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Hemachandran, E. ; Karthick, S. ; Laurell, T. ; Sen, A. K. / Relocation of coflowing immiscible liquids under acoustic field in a microchannel. In: EPL. 2019 ; Vol. 125, No. 5.

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TY - JOUR

T1 - Relocation of coflowing immiscible liquids under acoustic field in a microchannel

AU - Hemachandran, E.

AU - Karthick, S.

AU - Laurell, T.

AU - Sen, A. K.

PY - 2019/4/15

Y1 - 2019/4/15

N2 - We report the dynamics of coflowing immiscible liquid streams exposed to an acoustic standing wave in a microchannel. Relocation of the liquid streams is experimentally demonstrated and a theoretical model that explains the underlying phenomena is presented. Our experiments and theoretical model suggest that the relocation phenomena are governed by the interplay between the primary acoustic radiation force F ac and the interfacial tension force F int-which is represented in terms of a new dimensionless number called "acoustocapillary number", . Using various combinations of immiscible liquids, we show that relocation of the higher acoustic impedance liquid stream to the pressure node occurs above a critical acoustocapillary number . The understanding of the above phenomena provides a new paradigm related to the manipulation of immiscible liquids under acoustic field.

AB - We report the dynamics of coflowing immiscible liquid streams exposed to an acoustic standing wave in a microchannel. Relocation of the liquid streams is experimentally demonstrated and a theoretical model that explains the underlying phenomena is presented. Our experiments and theoretical model suggest that the relocation phenomena are governed by the interplay between the primary acoustic radiation force F ac and the interfacial tension force F int-which is represented in terms of a new dimensionless number called "acoustocapillary number", . Using various combinations of immiscible liquids, we show that relocation of the higher acoustic impedance liquid stream to the pressure node occurs above a critical acoustocapillary number . The understanding of the above phenomena provides a new paradigm related to the manipulation of immiscible liquids under acoustic field.

U2 - 10.1209/0295-5075/125/54002

DO - 10.1209/0295-5075/125/54002

M3 - Article

VL - 125

JO - Europhysics Letters

JF - Europhysics Letters

SN - 0295-5075

IS - 5

M1 - 54002

ER -