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effect of rayleigh accelerations applied to an initially moving fluidThe General Interpolant Method computer code was used to analyze two-dimensional unsteady thermal convection in circular cylinders under variable low-g conditions associated with space flight. When an acceleration vector was applied parallel to the thermal gradient, in the case of a fluid at rest, no convection resulted for the stable direction, and an instability led to Rayleigh convection for the opposite direction. However, when the acceleration had a component orthogonal to the gradient, convection resulted at any Rayleigh number. The effect on convection of both types of acceleration, applied concurrently or sequentially, was investigated, including the case when the resultant vector varied in direction with time. An analysis of experimental results shows that for space flight conditions, the Rayleigh accelerations induce significant, but not dominating, changes in the established convection even when the Rayleigh number is less than critical.
Document ID
19830062056
Document Type
Conference Paper
Authors
Dressler, R. F.
(NASA Headquarters Washington, DC United States)
Robertson, S. J.
(NASA Headquarters Washington, DC United States)
Spradley, L. W.
(Lockheed Missiles and Space Co., Inc. Huntsville, AL, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1982
Subject Category
ASTRONAUTICS (GENERAL)
Meeting Information
Materials processing in the reduced gravity environment of space; Annual Meeting(Boston, MA)
Distribution Limits
Public
Copyright
Other