Volume 125, Number 5, March 2019
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||15 April 2019|
Relocation of coflowing immiscible liquids under acoustic field in a microchannel
1 Department of Mechanical Engineering, Indian Institute of Technology Madras - Chennai 600036, India
2 Division of Nanobiotechnology, Department of Biomedical Engineering, Lund University 221 00, Lund, Sweden
Received: 19 September 2018
Accepted: 26 February 2019
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 Fac and the interfacial tension force Fint —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.
PACS: 47.61.-k – Micro- and nano- scale flow phenomena / 47.61.Jd – Multiphase flows / 47.55.N- – Interfacial flows
© EPLA, 2019
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