TURBULENT-FLOW THROUGH BIFURCATED NOZZLES

A finite-element model has been used to study steady-state turbulent f low through bifurcated submerged-entry nozzles with oversized ports ty pical of those used in the continuous casting of steel. Both 2D and 3D simulations have been performed with the commercial code FIDAP, using the standard K-epsilon turbulence model. Predicted velocities from 3D simulations compare reasonably with experimental measurements using a hot-wire anemometer conducted in a physical water model, where severe turbulent fluctuations are present. Results show that a 2D simulation can also capture the main flow characteristics of the jet existing th e nozzle and requires two orders of magnitude less computer time than the 3D simulation. A model combining the nozzle and mould was set up t o study the effect of the outlet boundary conditions of the nozzle on the jet characteristics. This modelling technique will assist in the d esign of submerged-entry nozzles, especially as applied to enhance ste el quality in the continuous casting process. Further, the model will provide appropriate inlet boundary conditions for a separate numerical model of the mould.