Modeling droplet size distribution from impinging jets

The modeling of thin sheets formed by impinging jets and their own inherent stability aspects hás been studied by Squire, Taylor, and Hasson, among others. It is well known that when two equal cylindrical coplanar jets collide they form a sheet whose thickness distribution is a function of the jet radius, the radial distance in the sheet, the impingement angle, and of some angular position referred to as a polé along the separation streamline. However, the physics of a viscous liquid sheet breakdown is the same for the several existing injectors; i,e., a small instability is amplified until it reaches a criticai wavelength, and the sheet fragments into ligaments that finally break down into drops of several sizes. Now, the mathematical formulation developed by Dom-browski and Johns for fan-spray nozzles3 can also be applied to the sheet formed by two impinging jets. Hence, the results obtained by Dombrowski and Hasson can be merged to allow a proper formulation in order to calculate the size and distribution of the droplets formed by colliding jets. Notice, however, that for sprays other than the above mentioned, one should refer, for instance, to the works of Levich and Marshall.