Abstract
A model is proposed to describe the collision rate of small particles suspended in a turbulent system. The model combines the possible collision mechanisms: 1) collisions due to the relative velocity between fluid and particles, and 2) collisions due to the turbulent diffusion of particles. This model also accounts for the effect of particle concentration on the collision rate. It was found that the turbulent diffusion of particles plays an important role in the collision of equally sized particles as well as of unequally sized particles. The model predictions also show that the collision rate of particles is strongly affected by the concentration of solid particles and by the turbulence intensity. Much more reliable predictions than previously possible have been obtained with the present model.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Saffman, P. G. and Turner, J. S.:J. Fluid Mech.,1, 16 (1956).
Yuu, S.:AIChE J.,30, 802 (1984).
Beal, S. K.:J. Aerosol Science,3, 113 (1972).
Levich, V. G.: “Physicochemical Hydrodynamics”, Prentice-Hall, Englewood Cliffs, New Jersey, 213 (1962).
Fuchs, N. A.: “The Mechanics of Aerosols”, Pergamon Press, Oxford, 299 (1964).
Owen, P. R.:J. Fluid Mech.,39, 407 (1969).
Melville, W. K. and Bray, K. N. C.:Int. J. Heat Mass Transfer,22, 647 (1979).
Sastry, K. V. S. and Gaschiguard. P.:Ind. Eng. Chem. Fundam.,20, 355 (1981).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Hahn, YB. A collision model for fine particles in a turbulent system. Korean J. Chem. Eng. 11, 246–253 (1994). https://doi.org/10.1007/BF02697391
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02697391