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Generation of capillary instabilities by external disturbances in a liquid jetThe receptivity problem in a circular liquid jet is considered. A time harmonic axial pressure gradient is imposed on the steady, parallel flow of a jet of liquid emerging from a circular duct. Using a technique developed in plasma physics a casual solution to the forced problem is obtained over certain ranges of Weber number for a number of mean velocity profiles. This solution contains a term which grows exponentially in the downstream direction and can be identified with a capillary instability wave. Hence, it is found that the externally imposed disturbances can indeed trigger instability waves in a liquid jet. The amplitude of the instability wave generated relative to the amplitude of the forcing is computed numerically for a number of cases.
Document ID
19850021934
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Leib, S. J. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 5, 2013
Publication Date
May 1, 1985
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NAS 1.15:87041
NASA-TM-87041
E-2503
Accession Number
85N30246
Funding Number(s)
PROJECT: RTOP 506-36-22
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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