涡流
湍流
机械
物理
层流下层
气溶胶
阻力
斯托克斯数
沉积(地质)
粒子(生态学)
经典力学
流量(数学)
颗粒流
气象学
雷诺数
地质学
海洋学
古生物学
沉积物
作者
John W. Brooke,K. Kontomaris,Thomas J. Hanratty,John B. McLaughlin
出处
期刊:Physics of fluids
[American Institute of Physics]
日期:1992-04-01
卷期号:4 (4): 825-834
被引量:152
摘要
The trajectories of aerosols are computed in a high-resolution direct numerical simulation of turbulent flow in a vertical channel. The aerosol equation of motion includes only a Stokes drag force and the influence of the aerosols on the gas flow is assumed to be negligible. Since the flow is vertical, aerosols deposit as a consequence of the turbulent fluctuations and their own inertia. It is shown that the eddies which are responsible for aerosol deposition are the same eddies that control turbulence production. Typical aerosol trajectories are shown and related to eddy structure. A free-flight theory suggested by Friedlander and Johnstone [Ind. Eng. Chem. 49, 1151 (1957)] is found to be based on reasonable assumptions about typical velocities of depositing aerosols as they pass through the viscous sublayer, but the theory is shown to be deficient in other respects. The distribution of normal velocities of the aerosols that deposit is compared to the distribution of fluid particle velocities in the viscous sublayer and some support is found for the notion that the probability distribution of Eulerian velocities may be useful in predicting deposition.
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