A numerical study on heat transport in turbulent Couette flows in concentric annuli
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 1 February 1997
Abstract
A numerical study is performed to investigate turbulent Couette flow and heat transfer characteristics in concentric annuli with a slightly heated inner cylinder moving in the flow direction. A two‐equation k‐ε turbulence model is employed to determine the turbulent viscosity and the turbulent kinetic energy. The turbulent heat flux is expressed by Boussinesq approximation in which the eddy diffusivity for heat is given as functions of the temperature variance t2‐ and the dissipation rate of temperature fluctuations εt, together with k and ε. The governing boundary‐layer equations are discretized by means of control volume finite‐difference technique and numerically solved using a marching procedure. It is disclosed from the study that the streamwise movement of the inner core causes substantial reductions in the turbulent kinetic energy and the temperature variance, particularly near the inner wall region, resulting in the deterioration of the Nusselt number, and that an attenuation in heat transfer performance is induced by the velocity ratio of the moving inner cylinder to the fluid flow.
Keywords
Citation
Torii, S. and Yang, W. (1997), "A numerical study on heat transport in turbulent Couette flows in concentric annuli", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 7 No. 1, pp. 81-94. https://doi.org/10.1108/09615539710156219
Publisher
:MCB UP Ltd
Copyright © 1997, MCB UP Limited