The collision efficiency of small drops
The collision efficiency of small drops
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DOI：
10.1002/qj.49709641013
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发表时间：
1959
影响因子：
8.9
通讯作者：
L. M. Hocking;P. Jonas
中科院分区：
文献类型：
--
作者：
L. M. Hocking;P. Jonas
由Stokes运动方程求出了两个运动球体上的力，充分考虑了球体周围流动的相互干扰，并计算了它们在重力作用下下落时的相对轨迹，从而得到碰撞效率E。对于半径最大为30μ的液滴与任何较小尺寸的液滴碰撞，确定E的值。这一结果与Pearcey和Hill(1957)的结果有很大的不同，并指出产生这种差异的原因是球体靠近时的运动对确定E是非常重要的。这些结果也与Schotland和Kaplin(1956)的结果不同。他们的实验没有对球体的密度与它们所落下的介质的密度之比进行建模，由于这一因素被证明是重要的，他们的结果被认为不适用于落在空气中的水滴。
The forces on two moving spheres are found from the Stokes equations of motion, full allowance being made for the mutual interference of the flows round the spheres, and the relative trajectories when they are falling under gravity are calculated so that the collision efficiency E can be found. The values of E are determined for drops of radius up to 30 μ colliding with droplets of any smaller size. The results differ widely from those found by Pearcey and Hill (1957) and it is suggested that the reason for the discrepancy is that the motion of the spheres when they are close together is of great importance in determining E. The results also differ from those found by Schotland and Kaplin (1956). Their experiments did not model the ratio of the density of the spheres to that of the medium through which they are falling and since it is shown that this factor is of importance, their results are not considered applicable to water drops falling in air.