The influence of inner-wall motion on the linear stability of natural convection in a tall vertical annulus

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Title:	The influence of inner-wall motion on the linear stability of natural convection in a tall vertical annulus
Authors:	Chen,JC;Chou,GH;Hsieh,CK
Contributors:	機械工程學系
Keywords:	FLOW
Date:	1996
Issue Date:	2010-06-29 18:06:38 (UTC+8)
Publisher:	中央大學
Abstract:	The linear stability of natural convection in a tall vertical annulus with inner-cylinder motion was studied. The results show that the stability characteristics are significantly modified by the inner-cylinder motion. For a small Prandtl number fluid with a smaller radius ratio the shear instability is dominant and the non-axisymmetric disturbance (m = 1) is most unstable no matter in which direction the inner cylinder is moving. For higher downward motion, the non-axisymmetric mode (m = 2) may replace modes m = 0 and 1 for some radius ratios. For higher Prandtl number fluids, the most unstable mechanism switches from a buoyant mode generated by the boundary layer near the outer cylinder to a buoyant mode induced by the boundary layer near the inner cylinder with an increase of curvature as the inner cylinder is moving.
Relation:	INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Appears in Collections:	[Graduate Institute of Mechanical Engineering] journal & Dissertation

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