The Collision Rate Of Monodispersed Particles InTurbulent Flows With Gravity
The Collision Rate Of Monodispersed Particles InTurbulent Flows With Gravity
复制标题
重力湍流中单分散粒子的碰撞率
DOI：
10.2495/afm040231
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
S. Komori
中科院分区：
文献类型：
--
作者：
R. Onishi;S. Komori
研究湍流中单分散粒子的碰撞问题，无论在机械工程领域还是在云微物理领域都具有重要意义。以前的一些研究对碰撞现象进行了研究，但在粒子运动各向同性的假设下，忽略了重力对粒子的影响。然而，重力效应是否可以忽略还没有定论。因此，在本研究中，我们采用直接数值模拟的方法研究了重力对碰撞频率的影响。结果表明，与零重力情况相比，作用在粒子上的重力降低了碰撞频率。当一个粒子的最终速度等于或大于根平均值时
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