Capacity and Estimation on Liquid Spray Cooling on a Hot Surface of Just Solidified Steel Shell.

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We believe that the beforehand desired purpose of this research has been attained for the most part. The research basically covers a few special fields such as fluid dynamics, two-phase flow theory, heat transfer and numerical analysis, and therefore the research consists of three stages. The results obtained here are summarized as follows :First, the nozzle flow of a two-phase mixture composed of gas and water-droplets, which is commonly applied to the secondary cooling zone of continuously cast slabs, has been analyzed and it has been investigated how the phase nonequilibrium phenomena occur in the subsonic as well as supersonic nozzle flows. Also, the establishment of the condition for optimum nozzle performance has been clarified from the standpoint of nozzle geometry.Second, in order to find the theoretical heat transfer mechanism of mist cooling on a hot plate with surface temperatures in excess of the Leidenfrost point a numerical analysis of subsonic and supersonic one-phase and gas-particle two-phase jets impinging, on a flat plate normal to flow has been investigated in detail by comparing the two-phase results with the corresponding one-phase ones.Third, the interaction between an impinging water jet and a conducting flat surface at a high temperature has been analyzed focusing upon the occurrence of the film boiling. It is considered that the boiling mechanism of two-phase mixture consisting of air and water-droplets on a hot plate can be treated as being analogous to that of the impinging water jet. The study of liquid spray cooling of a highly heated surface is being in progress from on experimental and theoretical point of view. The result will be reported in neav distant future.