Charge transfer in dust-agglomerate collisions and the efficiency of electrostatic secondary agglomeration

粉尘-团聚碰撞中的电荷转移和静电二次团聚效率

• 批准号: 35039911
• 负责人: Professor Dr. Jürgen Blum
• 金额: --
• 依托单位: Institut für Geophysik und Extraterrestrische Physik
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/35039911?language=en
• 关键词: Charge; transfer; dust; agglomerate; collisions

A possible explanation for a rapid formation of macroscopic bodies in protoplanetary disks in spite of low sticking probabilities is based upon charge separation in non-sticking collisions. Such a charge separation has been observed in laboratory collisions between microscopic dust particles and macroscopic solid targets. A succession of non-sticking collisions can lead to the build-up of surface charges and, thus, of strong electric fields on the larger bodies from which emerging, previously non-sticking dust particles are not able to escape. The proposed project aims at the experimental test of this concept and the modelling of the charge-induced growth of protoplanetary bodies. In addition to that, chondrule-formation theories based on nebular lightning will be tested.

一个可能的解释是，尽管粘着概率很低，但原行星盘中的宏观物体仍能快速形成，这是基于非粘着碰撞中的电荷分离。这种电荷分离已经在实验室微观尘埃颗粒和宏观固体目标之间的碰撞中观察到。一系列的非粘性碰撞会导致表面电荷的积累，从而在更大的物体上形成强电场，使之前非粘性的尘埃颗粒无法逃脱。拟议的项目旨在对这一概念进行实验测试，并建立电荷诱发原行星体增长的模型。除此之外，基于星云闪电的陨石球粒形成理论也将得到验证。