ENTRAINMENT CHARACTERISTICS OF TRANSIENT GAS JETS

Results are presented of theoretical analysis and computations of tran sient gas jets in a quiescent ambient environment, with injected to am bient density ratios of 2, 1, and 0.5. Comparisons of these results wi th those from previous work in gas jets are also presented. Turbulence is represented using a k-epsilon model. Entrainment rate is found to scale linearly with axial penetration, and the total mass entrained is shown to have a cubic dependence on axial penetration of the gas jet. The actual values of these quantities depend on a constant whose valu e obtained from measurements and quoted in the literature varies by as much as a factor of 2.