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Acoustic forcing of a liquid dropThe development of systems such as acoustic levitation chambers will allow for the positioning and manipulation of material samples (drops) in a microgravity environment. This provides the capability for fundamental studies in droplet dynamics as well as containerless processing work. Such systems use acoustic radiation pressure forces to position or to further manipulate (e.g., oscillate) the sample. The primary objective was to determine the effect of a viscous acoustic field/tangential radiation pressure forcing on drop oscillations. To this end, the viscous acoustic field is determined. Modified (forced) hydrodynamic field equations which result from a consistent perturbation expansion scheme are solved. This is done in the separate cases of an unmodulated and a modulated acoustic field. The effect of the tangential radiation stress on the hydrodynamic field (drop oscillations) is found to manifest as a correction to the velocity field in a sublayer region near the drop/host interface. Moreover, the forcing due to the radiation pressure vector at the interface is modified by inclusion of tangential stresses.
Document ID
19920011167
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Lyell, M. J.
(West Virginia Univ. Morgantown, VA, United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1992
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA-CR-190086
NAS 1.26:190086
Accession Number
92N20409
Funding Number(s)
CONTRACT_GRANT: NAG3-1005
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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