Digital Commons @ Michigan Tech Digital Commons @ Michigan Tech Turbulence-induced cloud voids: observation and interpretation Turbulence-induced cloud voids: observation and interpretation
Digital Commons @ Michigan Tech Digital Commons @ Michigan Tech Turbulence-induced cloud voids: observation and interpretation Turbulence-induced cloud voids: observation and interpretation
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数字共享@密歇根理工大学 数字共享@密歇根理工大学 湍流引起的云空洞：观察和解释 湍流引起的云空洞：观察和解释
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通讯作者：
Shaheer Ahmed
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作者：
H. Inam;Hajra Arshad;Usama Waqar;S. M. A. Zaidi;Shaheer Ahmed
。用激光薄片摄影技术在山顶站的云层中观测到了“云空洞”现象，即云中没有液滴的拉长体积。报道了两个实验案例，它们在湍流条件下相似，但液滴大小分布和云中空洞的分布不同。在研究Burgers涡内部重惯性沉积粒子的基础上，提出了一种理论解释。通过理论分析，得出了关于空洞现象的一般结论。多分散液滴运动的数值模拟考虑了真实的旋涡参数和Mie散射视觉效应，可以解释与观测到的尺寸相似的空洞的存在。在合理的云层条件下，讨论了涡流管中的聚集和分离效应。
. The phenomenon of “cloud voids”, i.e., elongated volumes inside a cloud that are devoid of droplets, was observed with laser sheet photography in clouds at a mountaintop station. Two experimental cases, similar in turbulence conditions yet with diverse droplet size distributions and cloud void prevalence, are reported. A theoretical explana-tion is proposed based on the study of heavy inertial sedimenting particles inside a Burgers vortex. A general conclusion regarding void appearance is drawn from theoretical analysis. Numerical simulations of polydisperse droplet motion with realistic vortex parameters and Mie scattering visual effects accounted for can explain the presence of voids with sizes similar to that of the observed ones. Clustering and segregation effects in a vortex tube are discussed for reasonable cloud conditions.