Turbulent particle dispersion  A comparison between Lagrangian and Eulerian modeling approaches
Abstract
The Lagrangian and Eulerian modeling approaches are compared for dilute gasparticle flows with particular emphasis on the ability of each model to account for turbulent particle dispersion. A MonteCarlo procedure is employed to simulate turbulent dispersion in the Lagrangian model, while a gradientdiffusion approximation is utilized in the Eulerian formulation. The kepsilon turbulence model is used to characterize the length and time scales of the fluid. The comparison is facilitated by applying the formulations to the prediction of particle concentration distributions in fullydeveloped turbulent pipe flow. Three test cases are investigated: (1) particle dispersion from a point source; (2) pointsource dispersion under the influence of a radial body force; and (3) particle collection from a uniform particle source with a radial body force. The results from each model show qualitative agreement, however, the extent of this depends strongly upon how the Lagrangian eddy time scale and Eulerian particle diffusivity are evaluated. The Lagrangian model is easily formulated to accommodate all the physics of momentum exchange between particle and gas, however, it is awkward to utilize and requires excessive computation time due to its stochastic nature. The Eulerian formulation does not lend itself to including the details of the gasparticle interactions, but can be efficiently solved by conventional numerical techniques.
 Publication:

GasSolid Flows  1986
 Pub Date:
 1986
 Bibcode:
 1986gsf..proc...23K
 Keywords:

 EulerLagrange Equation;
 Gas Dynamics;
 Particle Motion;
 Turbulent Flow;
 Two Phase Flow;
 KEpsilon Turbulence Model;
 Monte Carlo Method;
 Pipe Flow;
 Point Sources;
 Radial Distribution;
 Fluid Mechanics and Heat Transfer