DISPERSION OF DISCRETE PARTICLES IN A TURBULENT FLUID FIELD

被引:37
作者
CALABRESE, RV [1 ]
MIDDLEMAN, S [1 ]
机构
[1] UNIV MASSACHUSETTS,DEPT CHEM ENGN,AMHERST,MA 01003
关键词
D O I
10.1002/aic.690250614
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The degree of radial dispersion of medium size particles (ηK < dp < lf) emanating from a point source, is measured photographically in the turbulent core of a fully developed vertical pipe flow of water. From the classical theoretical results of G. Taylor, it was then possible to calculate statistical parameters which characterize the turbulent particle motion. A comparison is made between a tracer and neutrally dense, buoyant and heavy particles. Results indicate that the effect of particle intertia is negligible, and that the crossing trajectories effect dominates the dispersion process. A “wake effect” causes a buoyant particle to disperse to a greater degree than an equivalent heavy particle. An exponential‐cosine form of the Lagrangian autocorrelation coefficient provides a best fit for the dispersion data, although a purely exponential form is equally adequate for practical calculations. Copyright © 1979 American Institute of Chemical Engineers
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页码:1025 / 1035
页数:11
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