1989 Volume 29 Issue 4 Pages 339-344
The basic characteristics of pipe nozzle cooling with retaining water on a plate has been studied in a laboratory test by using a moving hot plate.
The cooling ability of pipe nozzle flow changes with the amount of retaining water. It was found that maximum cooling ability can be obtained when the depth of retaining water is approximately 50 mm. The cooling ability with retaining water increases slightly as the nozzle is raised, while the cooling ability without retaining water decreases as the nozzle height increases.
The influence of the cooling conditions, such as flow-type and plate temperature, on the cooling ability with retaining water was also investigated and the cooling ability of pipe nozzle flow was compared with that of slit nozzle flow with a large gap. It was found that the slit nozzle flow has less cooling efficiency than the pipe one in the high water flux, though no difference can be seen when the water flux is low.
