Controlling mixing inside a droplet by time dependent rigid-body rotation

Document Type

Conference Proceeding

Publication Date

1-1-2009

Abstract

The use of microscopic discrete fluid volumes (i.e., droplets) as microreactors for digital microfluidic applications often requires mixing enhancement and control within droplets. In this work, we consider a translating spherical liquid droplet to which we impose a time periodic rigid-body rotation which we model using the superposition of a Hill vortex and an unsteady rigid body rotation. This perturbation in the form of a rotation not only creates a three-dimensional chaotic mixing region, which operates through the stretching and folding of material lines, but also offers the possibility of controlling both the size and the location of the mixing. Such a control is achieved by judiciously adjusting the three parameters that characterize the rotation, i.e., the rotation amplitude, frequency and orientation of the rotation. As the size of the mixing region is increased, complete mixing within the drop is obtained. Copyright © 2008 by ASME.

Identifier

70049097080 (Scopus)

ISBN

[9780791848746]

Publication Title

ASME International Mechanical Engineering Congress and Exposition Proceedings

External Full Text Location

https://doi.org/10.1115/IMECE2008-68026

First Page

985

Last Page

990

Issue

PART B

Volume

13

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