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Oscillatory and streaming flow between two spheres due to combined oscillations

Published online by Cambridge University Press:  03 August 2017

Dejuan Kong Open the ORCID record for Dejuan Kong [Opens in a new window] ,
Anita Penkova  and
Satwindar Singh Sadhal
Dejuan Kong
Affiliation:
Department of Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, CA 90089-1453, USA
Anita Penkova
Affiliation:
Department of Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, CA 90089-1453, USA
Satwindar Singh Sadhal*
Affiliation:
Department of Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, CA 90089-1453, USA
*
†Email address for correspondence: sadhal@usc.edu
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Abstract

The flow induced by the combined torsional and transverse oscillations of a sphere with amplitude ratio $\unicode[STIX]{x1D6FC}$ and phase difference $\unicode[STIX]{x1D6FD}$ in a concentric spherical container is examined. Analytical solutions of the leading-order flow field and shear stress profiles have been obtained. Steady streaming flows are also analysed not only for the case of unrestricted Womersley number $|M|$, but also in the low-frequency $(|M|\ll 1)$ and high-frequency ($|M|\gg 1$) limits. At high frequency, the flow field has been divided into three regions: two boundary layers and the outer region. The streaming flow field is determined for the limiting case of the streaming Reynolds number $R_{s}\ll 1$. The results are compared with those of single torsional or transverse oscillation, and found to match very well. The amplitude ratio $\unicode[STIX]{x1D6FC}$ and phase difference $\unicode[STIX]{x1D6FD}$, in determining the streaming, are also discussed. The number and direction of steady streaming recirculation on the $r$–$\unicode[STIX]{x1D703}$ plane depend on value of the amplitude ratio $\unicode[STIX]{x1D6FC}$. The phase difference $\unicode[STIX]{x1D6FD}$ plays a dominant role in the azimuthal velocity $u_{1\unicode[STIX]{x1D719}}^{(s)}$ of steady streaming. When $\unicode[STIX]{x1D6FD}$ is approximately $(2n+1)\unicode[STIX]{x03C0}/2$, $u_{1\unicode[STIX]{x1D719}}^{(s)}$ vanishes under low-frequency oscillation, while steady streaming has a recirculation on the $r$–$\unicode[STIX]{x1D719}$ plane under higher-frequency oscillation.

JFM classification

Acoustics: Acoustics
Type
Papers
Information
Journal of Fluid Mechanics , Volume 826 , 10 September 2017 , pp. 335 - 362
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Copyright
© 2017 Cambridge University Press 

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