An integral model for confined axisymmetric turbulent jet mixing

An integral method is developed to model coaxial confined turbulent mixing, for application to pulverized coal combustors. The model includes a transformation to a constant density plane, non-unity Prandtl number effects, and a shear term representing free stream turbulence, important when the secondary-primary velocity ratio is near unity. There are two adjustable constants, one related to the Prandtl number and one to the free stream turbulence. The results compare well with the experiments of Landis and Shapiro when the constants are properly chosen. They show a different slope when compared to the few experimental points available for velocity ratio near unity (Memmot and Smoot). More experimental data are needed for this latter case.