2005 Volume 45 Issue 3 Pages 356-365
The pre-cooling system used in the cooling process of the hot rolled wire rod is a system that sprays cooling water at high pressure to cool the fast-moving wire rod to a required temperature when the rod passes through the cooling nozzle of the cooling box. The influence of the flow phenomenon of this cooling nozzle affecting the rod temperature and the factors affecting the cooling efficiency were examined through experiments and numerical analysis. The confined-type cooling nozzle showed a phenomenon where secondary flow or vortex was produced on the flow depending on the existence of chambers and variations in the Reynolds number, and the production of such vortex affected the rod cooling efficiency phenomenon. The wire rod cooling efficiency can be said to be most effective at a point where the wire rod and water jet impinge due to flow increase, viz, the Reynolds number increase. It is believed that the optimal conditions featuring excellent cooling efficiency can be deduced in the future by analyzing the flow conditions and design conditions.