The Collision Rate Of Monodispersed Particles In
Turbulent Flows With Gravity
Author(s)
R. Onishi & S. Komori
Abstract
It is of great importance to investigate the collisions of monodispersed particles
in turbulent flows both in the mechanical engineering and in the cloud
microphysics. A number of previous studies investigated the collision
phenomena but they neglected the effect of gravity acting on particles under the
assumption of the isotropy of particle motions. However, it is not concluded
whether the gravity effect can be neglected or not. In this study, therefore, we
investigated the effect of gravity on the collision frequency by using a direct
numerical simulation. The results show that the gravity acting on particles
decreases the collision frequency, compared to the zero-gravity case. When the
terminal velocity of a particle is comparable to or greater than the root mean
square value of fluid velocity, the effect of gravity is sign
Keywords
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