Abstract
There are a few papers reported about the high rate of heat transfer at the point of a water jet impingement. The value of the coefficient "h" of heat transfer decreases with a radius increasing steeply. And the effective cooling radius is not limitted definitely. For the application of water jet cooling to a flat plate, it is necessary to know the distribution function of "h" on the plate and the effective cooling area. The local values of "h" were measured in this experiment, in which the vertical circular water jet impinges against the horizontal plane. And a theoretical equations about "h" and the radius of the effective cooling area were obtained by the "apporoximate method of Karman-Pohlhausen". The comparison with equation of "h" and experimental data had a good agreement. For the convenience of cooling design, the relation between optimum water flow rate and nozzle pressure to give the proposed heat removal was discussed.
