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Convective Instability of a Gravity Modulated Fluid Layer with Surface Tension VariationGravity modulation of an unbounded fluid layer with surface tension variations along its free surface is investigated. In parameter space of (wavenumber, Marangoni number) modulation has a destabilizing effect on the unmodulated neutral stability curve for large Prandtl number, Pr, and small modulation frequency, Omega, while a stabilizing effect is observed for small Pr and large Omega. As Omega yields infinity, the modulated neutral stability curves approach the unmodulated neutral stability curve. At certain values of Pr and L2 multiple minima are observed and the neutral stability curves become highly distorted. Closed regions of subharmonic instability are also observed. Alternating regions of synchronous and subharmonic instability separated by very thin stable regions are observed in (1/Omega,g(sub 1)) space for the singly diffusive cases. Quasiperiodic behavior in addition to the synchronous and subharmonic responses, are observed for the case of a double diffusive fluid layer. Minimum acceleration amplitudes were observed to closely correspond with a subharmonic response, Lambda(sub im) = Omega/2 .
Document ID
19980201337
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Skarda, J. Raymond Lee
(NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1998
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA/TM-1998-207941
NAS 1.15:207941
E-11219
AIAA Paper 98-2599
Meeting Information
Meeting: Theoretical Fluid Mechanics Meeting
Location: Albuquerque, NM
Country: United States
Start Date: June 15, 1998
End Date: June 18, 1998
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
PROJECT: RTOP 962-24-00
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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