ENTRAPMENT CHARACTERISTICS OF TRANSIENT GAS JETS

Abstract Results are presented of theoretical analysis and computations of transient gas jets in a quiescent ambient environment, with injected to ambient density ratios of 2, 1, and 0.5. Comparisons of these results with those from previous work in gas jets art also presented. Turbulence is represented using a k-∊ 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 value obtained from measurements and quoted in the literature varies by as much as a factor of 2. Notes Address correspondence to Dr. John Abraham, Thermal Science and Propulsion Center, School of Mechanical Engineering, Purdue University, 1003 Chaffee Hall, West Lafayette, IN 47907-1003, USA.