• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Electromagnetic phenomena in granular flows in the laboratory and dusty plasmas in geophysics and astrophysics
【24h】

APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Electromagnetic phenomena in granular flows in the laboratory and dusty plasmas in geophysics and astrophysics

机译：APS-APS流体动力学分部第70届年会-事件-实验室中的颗粒流中的电磁现象以及地球物理和天体物理学中的尘土等离子体

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In clouds of suspended particles, collisions electrify particles and the clouds produce electric potential differences over large scales. This is seen in the atmosphere as lightning in thunderstorms, thundersnow, dust storms, and volcanic ash plumes, but it is a general phenomena in granular systems. The electrification process is not well understood. To investigate the relative importance of particle material properties and collective phenomena in granular and atmospheric electrification, we used several tabletop experiments that excite particle-laden flows. Various electromagnetic phenomena ensue. Measured electric fields result from capacitive and direct charge transfer to electrodes. These results suggest that while particle properties do matter (as previous investigations have shown), macroscopic electrification of granular flows is somewhat material independent and large-scale collective phenomena play a major role. As well, our results on charge separation and Halleffects suggest a very different view of the dynamics of clouds, planetaryrings, and cold accretion disks in proto-planetary systems.
机译：在悬浮粒子云中，碰撞使粒子带电，并且云产生了大范围的电势差。在大气层中，雷雨，雷暴雪，沙尘暴和火山灰羽流中的闪电被视为闪电，但这是颗粒系统中的普遍现象。电气化过程尚不完全清楚。为了研究颗粒材料特性和集体现象在颗粒和大气带电中的相对重要性，我们使用了多个桌面实验来激发载有颗粒的流动。随之而来的是各种电磁现象。测得的电场是由电容和直接电荷转移到电极产生的。这些结果表明，尽管颗粒性质确实很重要（如先前的研究所示），但颗粒流的宏观带电在某种程度上与材料无关，并且大规模的集体现象起着主要作用。同样，我们关于电荷分离和Halleffects的结果表明，对原行星系统中的云，行星环和冷积磁盘的动力学情况有很大不同。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号