Heat transfer in an annulus with rotating inner cylinder
TL;DR: In this paper, a finite difference technique was used to study the effect of parameters such as gap width, length of rotor, axial flow velocity, rotational speed and fluid properties on heat transfer.
Abstract: Heat transfer and fluid flow phenomena occurring in an annulus with an inner rotating cylinder have been studied numerically. A computer program was developed using a finite difference technique to study the effect of parameters such as gap width, length of rotor, axial flow velocity, rotational speed and fluid properties on heat transfer. Computer plots were obtained for the parameters such as tangential velocity, radial velocity, duct temperature, axial velocity, etc. The information obtained can be used in the estimation of the coefficients of heat transfer from a rotating surface.
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01 Mar 1996
TL;DR: In this article, the authors review relevant experimental, numerical and analytical research of heat transfer in both stationary and rotating annuli, with an emphasis on presenting useful information for designers, covering laminar and turbulent flows as well as flow regimes where transition occurs or vortex flows are present.
Abstract: The study of heat transfer by forced convection in annular passages is of interest across the range of process and aeronautical industries, for example from annular heat exchangers to the various configurations of annuli found in turbomachinery. The aim of this paper is to review relevant experimental, numerical and analytical research of heat transfer in both stationary and rotating annuli, with an emphasis on presenting useful information for designers. The geometries considered are the stationary annulas with superposed axial throughflow and the rotating annulus with rotation of either the inner or outer cylinder (both with and without throughflow). The work presented covers laminar and turbulent flows as well as flow regimes where transition occurs or vortex flows are present.
43 citations
Dissertation•
09 Jan 2014
1 citations
Cites background from "Heat transfer in an annulus with ro..."
...Further research into the heat transfer between two concentric rotating cylinders has been performed to understand the effects that certain parameters have on the heat transfer [32-41]....
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TL;DR: In this paper, the second phase of an investigation of the phenomena and variables which control the rate of heat transfer in the air gap of a rotating electrical machine is reported and compared with the results of previous studies.
Abstract: The second phase of an investigation of the phenomena and variables which control the rate of heat transfer in the air gap of a rotating electrical machine is reported. Experimental data for diabatic flow in an annulus are summarized and compared with the results of previous studies. The data are examined in terms of the types of flow processes occurring in an annulus, and it is found that the results for diabatic flow clearly confirm those obtained for adiabatic flow in showing the existence of three, and possibly four, modes of flow in this annulus. These modes are: (1) Laminar flow; (2) laminar-plus-Taylor- vortexes flow; (3) turbulent flow; (4) turbulent-plus-vortexes flow. The heat- transfer data were subdivided into the following two limiting cases and one general case: (1) axial flow with zero rotation; (2) rotation of inner cylinder with zero axial flow; (3) general case of combined axial flow and rotation. The heat-transfer data from this study and of previous investigations were correlated in terms of Reynolds number and Taylor number over a wide range of these variables in terms of fairly simple equations. Radial temperature profiles in the annular gap were measured for the diabatic flow and aided inmore » the understanding of the different flow phenomena in the annulus with an inner rotating cylinder.« less
201 citations
01 Jan 1974
10 citations