MIXING AND REACTION IN A TUBULAR JET REACTOR - A COMPARISON OF EXPERIMENTS WITH A MODEL-BASED ON A PRESCRIBED PDF

The simulation of chemical reactions in a turbulent fluid is very impo rtant for industrial applications. In particular, models which demand only moderate computational times while still taking into account the inhomogeneity of the reactor are of practical interest. An approach is presented here which applies a simulation of the turbulent now field in describing the transport production and dissipation of a non-reacti ve tracer. Two modelling approaches (the turbulent mixer model of Bald yga and the spectral relaxation model of Fox) are compared with experi mental data of a laboratory tubular jet reactor. The turbulent flow fi eld was obtained from a computational fluid dynamics code using the k- epsilon model. The closure approximation of Baldyga, which is based on a prescribed form of the probability density function is applied in m odelling chemical reactions. Simulations were performed for a series-p arallel reaction.