Abstract
Turbulent flow through rod bundle sub-channels is analysed using a two-dimensional eddy diffusivity and a higher order K − 1 model. The eddy diffusivity is a generalization of the Reichardt's model for a concentric annulus. The K − 1 model is used to examine the effects of anisotropic turbulent diffusion. Fully developed flow and thermal conditions are assumed with the rod surface subjected to uniform heat flux. Both 30° and 45° sub-channels, appropriate respectively for triangular and square arrangements of rods, are investigated. The pitch to diameter ratio (PDR) was varied from 1.1 to 1.5. The algebraic eddy diffusivity is found to reproduce literature information, including those ascribable to anisotropy or secondary flow effects. Thermal calculations have been carried out using Pr = 0.7 and both constant and variable values of turbulent Prandtl number. Calibrating calculations are performed for the concentric annular geometry.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call