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Charged Drop Dynamics Experiment Using an Electrostatic-Acoustic Hybrid System

Published online by Cambridge University Press:  26 February 2011

W. K. Rhim,
S. K. Chung,
E. H. Trinh and
D. D. Elleman
W. K. Rhim
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109
S. K. Chung
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109
E. H. Trinh
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109
D. D. Elleman
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109
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Abstract

In this paper, we describe the design and the performance of an electrostatic-acoustic hybrid system and its application to a charge drop rotation experiment. This system can levitate a charged drop electrostatically and induce drop rotation or oscillation by imposing an acoustic torque or an oscillating acoustic pressure. Using this system, the equilibrium shapes and stability of a rotating charged drop were experimentally investigated. A 3 mm size water drop was rotated as a rigid body and its gyrostatic equilibrium shapes were observed. Families of axisymmetric shapes, two-lobed shapes, and eventual fissioning have been observed. With the assumption of “effective surface tension” in which the surface charge simply modified the surface tension of neutral liquid, the results agree exceptionally well with the Brown and Scriven's prediction for uncharged drops.

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