GENERAL INTEGRAL FORMULATION OF TURBULENT BUOYANT JETS IN CROSS-FLOW

The turbulent buoyant jet in a nonuniform cross-now is formulated usin g a general integral method. The integral equations for the turbulent motion through the jet cross section are derived for a fixed control v olume and expressed in vector form. In contrast to previous work, the new formulation does not require the a priori assumption of a velocity and concentration distribution. Coupled with a Lagrangian jet spreadi ng hypothesis and the inclusion of added mass effect, the model is sho wn to predict correctly the properties of the asymptotic flow regimes in both the near field (straight jet and plume) and the far field (adv ected line puff and thermal). Predictions of the path-averaged jet pro perties are shown to be consistently supported by experimental data on visual trajectory and jet width, and centerline minimum dilution. The relation between the present formulation and previous Lagrangian/Eule rian models is also discussed.