The aerodynamic diameter of aggregates of uniform spheres
The aerodynamic diameter of aggregates of uniform spheres
复制标题
均匀球体聚集体的空气动力学直径
DOI：
10.1016/0021-9797(69)90225-2
复制
发表时间：
1969
影响因子：
4
通讯作者：
R. Blaschke
中科院分区：
文献类型：
--
作者：
W. Stöber;A. Berner̂;R. Blaschke
描述悬空状态下颗粒动力学行为的最有用的参数是空气动力学直径。这种颗粒大小定义的标准是空气中的颗粒在作用于颗粒质量的外力场的影响下相对于周围空气所获得的稳态速度。因此，我们将粒子的空气动力学或运动直径定义为具有单位密度的球体的直径，在机械力场中，该球体假定与所考虑的实际粒子具有相同的稳态速度。因此，空气动力学直径通常是虚构的，但它正确地描述了空气中颗粒的动态特性，而不需要关于颗粒形状或密度的信息。如果密度已知，我们使用斯托克斯直径会更接近实际，在相同的稳态速度标准下，斯托克斯直径被定义为与实际粒子具有相同密度的球体的大小。对于特殊粒子，实际大小和斯托克斯直径是相同的。斯托克斯定律将这个尺寸DS~，与稳态速度u×
The most useful parameter for describing the dynamic behavior of a particle in the air-borne state is the aerodynamic diameter. The criterion for this definition of particle size is the steady-state velocity which the air-borne particle attains relative to the surrounding air under the influence of an external force field acting upon the mass of the particle. Thus, we define the aerodynamic or kinetic diameter of a particle as the diameter of a sphere of unit density which, in a mechanical force field, assumes the same steady-state velocity as the actual particle under consideration. The aerodynamic diameter is, therefore, generally fictitious, but it properly describes the dynamic characteristics of an air-borne particle without requiring information about the particle shape or density. If the density is known, we would be closer to reality by using the Stokes diameter, which, by the same criterion of equal steady-state velocity, is defined as the size of a sphere having the same density as the actual particle. In the case of sptmrical particles, the actual size and the Stokes diameter are identical. Stokes' law relates this size, Ds~, to the steady-state velocity u by