Annular jets-I Fluid dynamics

Annular jets of water have been observed qualitatively and quantitatively. The jet behaviour has been found to depend primarily on the Weber number of the liquid sheet leaving the orifice.When the Weber number exceeds unity long thin jets are obtained; when it is less than unity, the jets take up a rounded form. At the transition point (W0 = 1) a discontinuity appears in the liquid sheet. A slight increase in Weber number from unity gives a …