Abonnement à la biblothèque: Guest

ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

CONVECTION PATTERN TRANSITION IN AN ANNULAR GAP AROUND A TRUNCATED CONICAL ROTOR IN A CIRCULAR CYLINDER

Get access (open in a dialog) DOI: 10.1615/IHTC13.p20.160
12 pages

Résumé

Viscous flows in a concentric annulus with rotating inner cylinder is characterized by Taylor-Couette flow. This is also the case when the annular gap is formed between two conical cylinders, where the flow is essentially three-dimensional due to the existence of basic flow induced by imbalance of centrifugal force in the annulus. At high angular velocity, i.e. supercritical and subcritical regions, unsteady Taylor vortex and steady basic flow coexist in the gap. When the inner rotating cone is submerged in a cylindrical vessel, the effect of imbalanced centrifugal force dominates the flow field as well, while the basic flow, rather than the Taylor vortex, having 3D structure appeared even at rather high angular velocity. This paper describes the convection patterns and their transitions appearing in the annular gap confined by conical rotor and cylindrical vessel under isothermal and non-isothermal operations. Observed flow patterns are classified roughly into several modes: natural convection, mixed convections, basic flow, single-frequency and multi-frequency modes, and are well organized in terms of representative aspect ratio, Reynolds, Prandtl and Rayleigh numbers.