Conference proceeding
Numerical studies of mixed convection flows in the annulus between vertical concentric cylinders with rotating inner cylinder
Heat transfer 1986; Proceedings of the Eighth International Conference, San Francisco, CA; UNITED STATES; 17-22 Aug. 1986, pp.435-440
01 Aug 1986
Abstract
A numerical study has been conducted to determine the heat transfer characteristics and flow patterns which develop around a rotating, heated vertical cylinder enclosed within a stationary concentric cylinder. A tall annulus (aspect ratio of 10) with fixed, adiabatic horizontal endplates and a radius ratio of 2 has been considered. Solutions reveal that two instabilities exist for this geometry, one being purely hydrodynamic and the other thermal in origin. The hydrodynamic instability manifests itself by the appearance of the toroidal Taylor vortices, while the thermal instability is characterized by the sudden onset of a multicellular flow pattern. The mutual interaction of both modes of instability, and the resultant effects on the flow patterns and heat transfer rates are investigated. A wide range of parameters is studied (Re = 0-1000; Gr = 0-100,000) for the air-filled gap (Pr = 0.7). Heat transfer rates are presented as a function of the rotational parameter, sigma = Gr/Re-squared. This parameter is a densiometric Froude number, and gives the relative importance of the buoyancy and rotational effects. Solutions are obtained by solving the time-dependent Navier-Stokes and energy equations, cast in the stream function vorticity swirl velocity form. (Author)
Metrics
Details
- Title
- Numerical studies of mixed convection flows in the annulus between vertical concentric cylinders with rotating inner cylinder
- Creators
- KENNETHS BallBakhtier Farouk
- Publication Details
- Heat transfer 1986; Proceedings of the Eighth International Conference, San Francisco, CA; UNITED STATES; 17-22 Aug. 1986, pp.435-440
- Conference
- Heat transfer 1986; Eighth International Conference, 8th (San Francisco, California, United States, 17 Aug 1986 - 22 Aug 1986)
- Number of pages
- 1
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Mechanical Engineering and Mechanics
- Identifiers
- 991019196679204721