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Acoustic measurement of the surface tension of levitated dropsThe measurement of the frequency of the fundamental mode of shape oscillation of acoustically levitated drops has been carried out to determine the surface tension of the drop material. Sound fields of about 20 kHz in frequency allow the suspension of drops a few millimeters in size, as well as the necessary drive for oscillations. The surface tension of water, hexadecane, silicone oil, and aqueous solutions of glycerin levitated in air has been measured, and the results have been compared with those obtained with standard ring tensiometry. The two sets of data are in good agreement, the largest discrepancy being about 10 percent. Uncertainties in the effects of the nonspherical static shape of drops levitated in the earth's gravitational field and the rotation state of the sample are the major contributors to the experimental error. A decrease of the resonance frequency of the fundamental mode indicates a soft nonlinearity as the oscillation amplitude increases.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Trinh, E. H.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Marston, P. L.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Robey, J. L.
(California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Date Acquired
August 14, 2013
Publication Date
July 1, 1988
Publication Information
Publication: Journal of Colloid and Interface Science
Volume: 124
ISSN: 0021-9797
Subject Category
Accession Number
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