(126j) A Low-Dimensional Modeling Approach for Turbulent Particle-Laden Flows

A variant of the One-Dimensional Turbulence(ODT) model formulated in an Eulerian reference frame is used to study turbulent particle laden planar jet flows. ODT is an outgrowth of the Linear Eddy model that solves unfiltered governing equations in one spatial dimension with a stochastic model for turbulence. The stochastic process consists of a sequence of events, each of which involves transformation of the fields evolving in the flow. These events may be interpreted as the model analogue of individual turbulent eddies which are referred to as ?eddy events? or simply ?eddies? punctuate the continuously evolving gas phase. A Lagrangian tracking model is implemented for the particles and when a particle encounters an eddy, along with the drag exerted by the gas phase velocity, its motion is also affected by an additional eddy velocity. The additional velocity represents turbulent mixing effects in the flow.

The turbulent mixing implemented through eddy events influence the particle dispersion and the dispersion depends on the size of the particles. Particles with different sizes are considered for this study and results indicate that eddy-particle interaction is quite sensitive to the size of the particles. It is also observed that small size particles disperse to the edge of the jet where as large particles tend to concentrate at the center of the jet. Results from the ODT simulations are compared with measurements. Both 1-way and 2-way coupling are considered in this work and particle effects on the gas phase are also studied.