The spreading rate of nonhomogeneous turbulent jets

Dimensional analysis suggests that the growth of the half width of a turbulent jet issuing into a quiescent fluid is independent of exit conditions, including nozzle geometry and density difference. The hypothesis is confirmed by an extensive survey of the experimental data. The empirical formulae of the half width of velocity, temperature, and concentration are given for round and plane jets. As an application the turbulent Prandtl and Schmidt numbers are obtained from the empirical formulae. Consideration is given to the limits of the results.