MODELING THE SCALAR DISSIPATION RATE FOR A TURBULENT SERIES-PARALLEL REACTION

Computational fluid dynamics (CFD) offers a powerful approach for simu lating the turbulent flows present in many chemical reactors. When com bined with probability density function (PDF) methods, CFD can treat c omplex, finite-rate chemistry without modeling. Nevertheless, the accu rate prediction of turbulence-chemistry interactions depends strongly on the model employed to close the scalar dissipation rate. The spectr al relaxation model (SRM) for the scalar dissipation rate overcomes ma ny of the shortcomings of the standard model by including a non-equili brium description of the scalar energy spectrum. A Lagrangian PDF form ulation of the SRM is employed in this work to study a series-parallel reaction (A + B --> R, R + B --> S) in a single-jet tubular reactor a nd the results are compared to experimental data and earlier results f ound with the standard model.