回転ロールの高性能冷却に関する基礎研究 : 第1報, 裸管の場合および円筒状狭い空間を設ける場合の沸騰熱伝達特性

抄録

This paper is the first report of an experimental study on a new highly efficient cooling method for hot strip mill work-roll cooling. The boiling heat transfer characteristics of a heated horizontal cylinder revolving in a pool or in annular narrow spaces were investigated experimentally. The obtained data were compared with the data on a stationary cylinder with the same narrow space conditions and the data on a revolving cylinder without narrow space. Experimental results show that the cylinder revolving in the small narrow space receives a much greater heat transfer promotion than that in the case without narrow space conditions, and the boiling heat transfer characteristics of the cylinder revolving in the small narrow space are not greatly affected by revolving speed and heat flux, but are mainly governed by the gap dimensions of the narrow space.