Distribution of Perforations in a Radially Thinning Liquid Sheet, 1992 Engineering Conference Proceedings

This investigation of sprays is focused on the formation and breakup of sheets formed by splash plate nozzles. An expression for predicting the thickness of a sheet spreading on a plate was obtained by modifying equations available in the literature. This sheet thickness predicted with this expression correlates well with measurements made during this study; thus this equation may be a useful tool in the design of splash plate nozzles.

High speed video images of splash plate sheets were collected at a series of downstream locations. The perforations observed were counted, and the data were used to determine the radial distribution of perforations as a function of the nozzle orifice diameter and the jet velocity. For each combination of orifice diameter and jet velocity, there was a critical distance downstream at which rapid perforation occurred.

The predicted thickness at the plate edge was then used as a basis for estimating the thickness of the free sheet. downstream from the plate edge. The perforation counts are plotted versus the calculated downstream sheet thickness. and the majority of the perforations are shown to be formed in a narrow range of sheet thicknesses.