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Particle segregation in falling polydisperse suspension droplets

Published online by Cambridge University Press:  13 March 2015

Melissa Faletra ,
Jeffrey S. Marshall ,
Mengmeng Yang  and
Shuiqing Li
Melissa Faletra
Affiliation:
School of Engineering, University of Vermont, Burlington, VT 05405, USA
Jeffrey S. Marshall*
Affiliation:
School of Engineering, University of Vermont, Burlington, VT 05405, USA
Mengmeng Yang
Affiliation:
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing, 100084, PR China
Shuiqing Li
Affiliation:
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing, 100084, PR China
*
†Email address for correspondence: [email protected]
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Abstract

The problem of a suspension droplet falling under gravity was examined for polydisperse droplets composed of a mixture of particles with different densities and sizes. The study was conducted using both simulations based on oseenlet particle interactions and laboratory experiments. The hydrodynamic interactions of the particles within the suspension droplet allow a polydisperse collection of particles to fall as a coherent droplet, even for cases where the difference in particle terminal velocity would cause them to separate quickly from each other in the absence of hydrodynamic interactions. However, a gradual segregation phenomenon is observed in which particles with lower terminal velocity preferentially leave the suspension droplet by entering into the droplet tail, whereas particles with higher terminal velocity remain for longer periods of time within the droplet. When computations and experiments are performed for bidisperse mixtures, a point is eventually reached where all of the lighter/smaller particles are ejected into the droplet tail and the droplet continues to fall with only the heavier/larger particles.

JFM classification

Mixing: Mixing Multiphase and Particle-laden Flows: Multiphase and Particle-laden Flows Multiphase and Particle-laden Flows: Particle/fluid flow
Type
Papers
Information
Journal of Fluid Mechanics , Volume 769 , 25 April 2015 , pp. 79 - 102
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Copyright
© 2015 Cambridge University Press 

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