Water Drainage Time of Pipe Laminar Type Cooling Equipment

Abstract

Cooling equipment of the pipe laminar type is utilized on run-out tables in hot strip mills. It is known that the responsiveness of starting and stopping cooling water injection affects cooling accuracy. In this study, experiments and calculations were performed in order to research the water drainage behavior of pipe laminar type cooling equipment. The experimental apparatus consisted of a single nozzle, orifice, header and air inlet tube. The calculation model considered Bernoulli’s theorem and pressure loss. The experimental results showed that the pressure loss of the air inlet tube and the nozzle affects water drainage time. The calculated results showed good agreement with the experimental results. Therefore, it is possible to estimate the water drainage time of pipe laminar equipment by the developed calculation model. Based on the calculation model, we suggested that the optimum diameter of the air inlet tube is 12 mm.