WATER SPRAY COOLING OF STAINLESS AND C-MN STEEL

This paper describes laboratory cooling experiments of C-Mn and stainl ess steel with a water/air nozzle, Experiments included use of both th e steady state and the transient experimental method. The heat transfe r coefficient was calculated both analytically and by a numerical meth od. The heat transfer coefficient was evaluated as a function of steel surface temperature, water flux, material and water/air flow, It was found that by increasing the water flux the heat transfer coefficient also increased. The Leidenfrost point was shifted to higher temperatur es. Increasing air flow was also found to increase the heat transfer c oefficient. Maximum heat transfer coefficient was twice as large for t he C-Mn steel as for the stainless steel. Comparison of the steady sta te and transient experimental method showed good agreement in the temp erature range 200 - 500 degrees C, and with a water flux of 2 l/m(2) s . Above 500 degrees C it was difficult to obtain stable conditions for the steady state experiments.