Vortex breakdown phenomena in a circular pipe. 5th report Axisymmetric breakdown in rotating conical pipes.
نویسندگان
چکیده
منابع مشابه
Axisymmetric Vortex Breakdown in a PipeS
A recent theory of the nearly axisymmetric vortex breakdown in a pipe is presented. We study the motion of an axisymmetric and inviscid swirling ow in a pipe with certain boundary conditions that may reeect the physical situation. The theory is built of global analysis of solutions of the Squire-Long equation and linear stability analysis of these solutions. The theory uniies the major previous...
متن کاملAxisymmetric vortex breakdown Part 2. Physical mechanisms
The physical mechanisms for vortex breakdown which, it is proposed here, rely on the production of a negative azimuthal component of vorticity, are elucidated with the aid of a simple, steady, inviscid, axisymmetric equation of motion. Most studies of vortex breakdown use as a starting point an equation for the azimuthal vorticity (Squire 1960), but a departure in the present study is that it i...
متن کاملComparisons of Experimental and Numerical Results for Axisymmetric Vortex Breakdown in Pipes
Experimental data for the bubble mode of breakdown in pipe ows is compared with calculations of the axisymmetric form of the Navier-Stokes equations. The location of breakdown in the calculations is found to be extremely sensitive to the inlet conditions; however, generally good agreement between the experimental and numerical breakdown locations is obtained. Detailed comparisons of the velocit...
متن کاملAxisymmetric Vortex Breakdown in an Enclosed Cylinder Flow
The attraction of the confined swirling flow generated inside an enclosed cylinder by the constant rotation of one of its endwalls to a study of vortex breakdown is that the flow is defined by only four variables, these being the height H and radius R of the cylinder, the constant angular speed of rotation of the endwall f~ and the kinematic viscosity t~. These four variables are used to define...
متن کاملAxisymmetric vortex breakdown Part 1. Confined swirling flow
A comparison between the experimental visualization and numerical simulations of the occurrence of vortex breakdown in laminar swirling flows produced by a rotating endwall is presented. The experimental visualizations of Escudier (1984) were the first to detect the presence of multiple recirculation zones and the numerical model presented here, consisting of a numerical solution of the unstead...
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ژورنال
عنوان ژورنال: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
سال: 1986
ISSN: 0387-5016,1884-8346
DOI: 10.1299/kikaib.52.1626