Spray angle model using Gaussian CDRSV theory

The spray angle of a Newtonian liquid jet injected into still gas is modeled with conditional damped random surface velocity (CDRSV) theory. This theory of turbulent jet breakup hypothesizes that velocity fluctuations at the free surface are the cause of breakup. These fluctuations are treated as Gaussian random variables in this work. Conditional ensemble averages are used to analytically compute quantities of interest because not all fluctuations cause breakup. Differences between CDRSV theory and previous theories are emphasized. The model considers not only the liquid Weber number and density ratio, but also the liquid turbulence intensity and Reynolds stress. The model is compared against an experimental database using only data points with known turbulence intensities to avoid unnecessary uncertainty and to better generalize the model.