惯性引发非球形大气颗粒的强烈取向波动
Inertia induces strong orientation fluctuations of non-spherical atmospheric particles
AI总结：
该研究通过实验与理论分析揭示，空气中亚毫米非球形颗粒因高颗粒-流体密度比产生惯性取向振荡，为大气颗粒建模提供关键依据。
摘要：
大气中火山灰和冰晶等非球形颗粒的取向会影响其停留时间以及大气的辐射特性。本研究通过实验表明，在静止空气中沉降的重型亚毫米级球状体，其取向呈现衰减振荡；而在液体中则呈单调弛豫。理论分析表明，这些振荡源于颗粒惯性，由较大的颗粒-流体质量密度比所致。要对大气中的固体颗粒进行建模，必须考虑该效应。
英文摘要：
The orientation of non-spherical particles in the atmosphere, such as volcanic ash and ice crystals, influences their residence times, and the radiative properties of the atmosphere. Here, we demonstrate experimentally that the orientation of heavy submillimeter spheroids settling in still air exhibits decaying oscillations, whereas it relaxes monotonically in liquids. Theoretical analysis shows that these oscillations are due to particle inertia, caused by the large particle-fluid mass-density ratio. This effect must be accounted for to model solid particles in the atmosphere.
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