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Effects of acoustic-streaming-induced flow in evaporating nanofluid droplets

Published online by Cambridge University Press:  19 December 2011

Abhishek Saha ,
Saptarshi Basu  and
Ranganathan Kumar
Abhishek Saha
Affiliation:
Department of Mechanical Materials and Aerospace Engineering, University of Central Florida, Orlando, FL 32816, USA
Saptarshi Basu
Affiliation:
Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, India
Ranganathan Kumar*
Affiliation:
Department of Mechanical Materials and Aerospace Engineering, University of Central Florida, Orlando, FL 32816, USA
*
†Email address for correspondence: ranganathan.kumar@ucf.edu
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Abstract

We study the effect of acoustic streaming on nanoparticle motion and morphological evolution inside an acoustically levitated droplet using an analytical approach coupled with experiments. Nanoparticle migration due to internal recirculation forms a density stratification, the location of which depends on initial particle concentration. The time scale of density stratification is similar to that of perikinetic-driven agglomeration of particle flocculation. The density stratification ultimately leads to force imbalance leading to a unique bowl-shaped structure. Our analysis shows the mechanism of bowl formation and how it is affected by particle size, concentration, internal recirculation and fluid viscosity.

JFM classification

Drops and Bubbles: Drops Micro-/Nano-fluid dynamics: Micro-/Nano-fluid dynamics
Type
Papers
Information
Journal of Fluid Mechanics , Volume 692 , 10 February 2012 , pp. 207 - 219
Copyright
Copyright © Cambridge University Press 2011

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