HEAT-TRANSFER ANALYSIS OF TURBULENT PARALLEL COUETTE FLOWS USING ANISOTROPIC K-EPSILON MODEL

An anisotropic k-epsilon turbulence model is employed for numerical an alysis of heat transport phenomena in turbulent parallel Couette flow with one surface moving in the flow direction and the other remaining stationary. The turbulent viscosity, turbulent kinetic energy, and nor mal components of the Reynolds stress are determined. The normal and s treamwise turbulent heat fluxes are obtained by means of an anisotropi c two-equation model of heat transfer, in which anisotropic eddy diffu sivities of heat are expressed in terms of the temperature variance (t (2)) over bar, the dissipation rate of temperature fluctuations epsilo n(t), and the velocity gradient. It is disclosed that (1) wall movemen t causes a reduction in the velocity gradient near the moving wall, re sulting in a decrease in turbulent kinetic energy; (2) this attenuatio n causes a deterioration in heat transfer performance on the moving wa ll side; and (3) wall movement induces both the velocity dissipation a nd temperature dissipation timescales with little change of their rati o outside the near-wall region.