Convective stability of a nonisothermal fluid in a rotating horizontal coaxial gap |
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Authors: | A A Vyatkin A A Ivanova V G Kozlov |
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Institution: | (1) Lehrstuhl f?r Zoologie, Technische Universit?t M?nchen, Lichtenbergstr. 4, 85747 Garching, Germany;(2) Department of Physiology, University of Sydney, Sydney, NSW, 2006, Australia;(3) Centre for Auditory Research, University College London, 332 Gray’s Inn Road, London, WC1X 8EE, UK |
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Abstract: | The thermal fluid convection in a coaxial horizontal gap uniformly rotating about its axis is investigated. The threshold
above which convective flows are excited and the structure of these flows are studied. It is found that convection ensues
irrespective of whether the inner or outer boundary temperature is higher. Convection manifests itself in the threshold development
of rolls elongated in the direction of the rotation axis and is determined by two different mechanisms. If the layer is heated
from outside, the centrifugal convection mechanism plays a leading part and the diameter of the convective rolls is comparable
with the layer thickness. If the higher is the temperature of the inner boundary of the layer, the centrifugal inertia force
has a stabilizing effect and convection development is related with the action of thermal vibrational mechanism. The latter
is determined by gravity-generated oscillations of the nonisothermal fluid relative to the cavity. The wave number of the
vibrational convective structures is several times smaller than under centrifugal convection. The results obtained broaden
our understanding of thermal convection in systems rotating in external static force fields. |
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