Abstract
Collisions of monodisperse particles in turbulent flows are important phenomena appearing in both the mechanical engineering and cloud microphysics. Although many researchers investigated the phenomena, they neglected the gravity effects in order to use a simple assumption of isotropic particle motions. In this study, we therefore investigated the gravity effects on the collision frequency and proposed a model that can predict the effects. We confirmed the reliability of the proposed model with the data obtained by direct numerical simulations (DNS). Furthermore, we clarified that, although the gravity effects are significant for moderately small Re number flows, they are negligibly small in typical convective clouds.
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