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Experimental investigation on particle size and launch angle distribution of lofted dust particles by electrostatic forces
Advances in Space Research ( IF 2.6 ) Pub Date : 2021-04-08 , DOI: 10.1016/j.asr.2021.03.037
Necmi Cihan Orger , Kazuhiro Toyoda , Hirokazu Masui , Mengu Cho

Electrostatic dust transportation is one of the fundamental sources for dust activity on airless planetary bodies. Even though a series of laboratory experiments have been performed to improve our understanding of the physics behind the electrostatic dust mobilization, there are several factors to investigate such as the launch angles, the lofted particle sizes, the traveling distance of the lofted grains, the initial acceleration to the launching velocities and so on. In this experimental study, an electron beam is used with 450 eV energy to produce secondary electrons to initiate lofting of the silica microspheres in the vacuum chamber, and the particle trajectories are recorded with a microscopic telescope and a high-speed camera. The dust samples are prepared as a mixture of particles with sizes from several micrometers to approximately 90.0 μm in radius. In addition, a polyimide tape with the adhesive surface is placed around the dust sample to collect the lofted particles up to approximately 10.0 cm distance. The collected silica microspheres are studied under the microscope to measure the size variation over the distance from the dust source. The experiment results show that spherical particles and residues effortlessly reach up to 10 cm distance, whereas the fluffy dust aggregates are observed particularly near the dust sample. In addition, the analysis of trajectories shows that the dust grains accelerate rapidly to their launching velocities below 12.0 ms due to the repulsion between the neighboring dust particles. Finally, the peak of the dust launching angle distribution is determined to be around 43.5–45° from the surface normal.



中文翻译:

静电力作用下扬尘颗粒粒径及发射角分布的实验研究

静电尘埃输送是无空气行星体上尘埃活动的基本来源之一。尽管已经进行了一系列实验室实验来提高我们对静电尘埃移动背后物理原理的理解,但仍有几个因素需要研究,例如发射角度、放样颗粒尺寸、放样颗粒的行进距离、初始加速到发射速度等。在本实验研究中,电子束与 450电动汽车产生二次电子的能量在真空室中引发二氧化硅微球的放样,并用显微望远镜和高速相机记录粒子轨迹。粉尘样品制备为粒径从几微米到大约 90.0 的颗粒混合物μ在半径。此外,在灰尘样品周围放置带有粘性表面的聚酰亚胺胶带,以收集高达约 10.0厘米距离。在显微镜下研究收集的二氧化硅微球,以测量距尘源距离的尺寸变化。实验结果表明,球形颗粒和残留物可轻松达到 10厘米距离,而在灰尘样本附近观察到蓬松的灰尘聚集体。此外,轨迹分析表明,尘埃颗粒迅速加速到低于 12.0 的发射速度小姐由于相邻尘埃粒子之间的排斥。最后,尘埃发射角分布的峰值被确定为距表面法线约 43.5-45°。

更新日期:2021-06-15
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