LAGRANGIAN STOCHASTIC-DETERMINISTIC (LSD) PREDICTIONS OF PARTICLE DISPERSION IN TURBULENCE

被引：50

作者：

MILOJEVIC, D

机构：

来源：

PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION | 1990年 / 7卷 / 04期

关键词：

D O I：

10.1002/ppsc.19900070132

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A Lagrangian model of particle motion in turbulence has been developed. The model is stochastic in the sense that the "instantaneous" fluid velocity field is generated from known turbulence energy and time scales of large eddies by using a random sampling. The particle motion during the interaction with the eddies is deterministic as being predicted from solutions of Lagrangian momentum equations. On the basis of a large number of calculated trajectories, the distributions of local particle mean and fluctuation velocity components and of the mean square particle displacement are evaluated in a flow domain. The results of the predictions for the case of particle dispersion in nearly homogeneous and isotropic turbulence behind a grid are compared with existing experimental data and satisfactory agreement is achieved. The model is also applied to the case of the particle dispersion from a point source in a nonhomogeneous turbulence of fully developed pipe flow. The agreement with experiments is satisfactory for both heavy and tracer particles. An explanation is given for the experimentally observed phenomenon that in some cases heavy particles disperse faster than fluid points.

引用

页码：181 / 190

页数：10

共 22 条

[1]

Monin A.S., Yaglom A.M., (1965)

[2]

Snyder W.H., Lumley J.L., Some Measurements of Particle Velocity Autocorrelation Function in Turbulent Flow, J. Fluid Mech., 48, pp. 41-71, (1971)

[3]

Wells M.R., Stock D.E., The Effects of Crossing Trajectories on the Dispersion of Particles in a Turbulent Flow, J. Fluid Mech., 136, pp. 31-62, (1983)

[4]

Arnason G., (1982)

[5]

Berlemont A., Picart A., Gouesbet G., The Code DISCO‐2 for Predicting the Behaviour of Discrete Particles in Turbulent Flows and its Comparisons Against the Code DISCO‐1 and Experiments, Proc. Third International Conference on Numerical Methods in Laminar and Turbulent Flows, pp. 963-973, (1983)

[6]

Pourahmadi F., Humphrey J.A.C., Modelling Solid‐Fluid Turbulent Flows with Application to Predicting Erosive Wear, Physico‐Chemical Hydrodynamics, 4, pp. 191-219, (1983)

[7]

Elghobashi S., Abou-Arab T., Rizk M., Mostafa A., Prediction of the Particle Laden Jet with a Two‐Equation Turbulence Model, Int. J. Multiphase Flow, 10, pp. 697-710, (1984)

[8]

Shih T.-H., Lumley J.L., Second‐Order Modelling of Particle Dispersion in a Turbulent Flow, J. Fluid Mech., 163, pp. 349-363, (1986)

[9]

Gosman A.D., Ioannides E., Aspects of Computer Simulation of Liquid Fueled Combustors, J. Energy, 7, pp. 482-490, (1983)

[10]

Shuen J.-S., Chen L.-D., Faeth G.M., Evaluation of a Stochastic Model of Particle Dispersion in a Turbulent Round Jet, AIChE J., 29, pp. 167-170, (1983)

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