Tiny particles such as ice crystals or ash particles tend to oscillate as they settle through the atmosphere.
Tiny particles such as ice crystals or ash particles tend to oscillate as they settle through the atmosphere. In their experiments, the scientists were able to track non-spherical particles of size smaller than 1 millimeter with unprecedented accuracy. Their observations gave rise to a model which can help to refine prediction on air pollutants or weather forecasts.
The atmosphere contains many tiny solid particles. Scientists from the Max Planck Institute for Dynamics and Self-Organization (MPI-DS) and the University of Göttingen in collaboration with the Centre national de la recherche scientifique (CNRS) in France and the university of Gothenburg, Sweden, now studied how such non-spherical particles settle in air. For this, they used a new precision apparatus equipped with high-speed cameras and a novel particle injection mechanism. Using a 3D-printer, they created particles of different shapes resembling discs of thickness as low as 50 micrometer and rods of length as high as 880 micrometers. Thanks to this setup, they could observe that particles tend to oscillate as they settle in quiescent air.
“So far, most studies on the behavior of such small particles were done with models in liquids since experiments in air are extremely challenging,” Mohsen Bagheri, group leader at MPI-DS, describes previous approaches. “However, the true settling dynamics could not be explored this way. They were now revealed in our experimental setting, directly measuring the motion of real-size particles, which are much heavier than the surrounding environment,” he continues. The observed oscillation could impact the collision of individual particles, their travelling distance in the atmosphere and their interaction with the solar radiation.
Read more at Max Planck Institute for Dynamics and Self-Organization
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