Laboratory measurements of charge separation in low liquid water content conditions and low impact velocity
Laboratory measurements of charge separation in low liquid water content conditions and low impact velocity
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DOI：
10.1002/jgrd.50555
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发表时间：
2013-06
期刊：
影响因子：
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通讯作者：
E. Ávila;R. A. Lighezzolo;N. Castellano;R. Pereyra;R. Bürgesser
中科院分区：
文献类型：
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作者：
E. Ávila;R. A. Lighezzolo;N. Castellano;R. Pereyra;R. Bürgesser
在这项工作中，提出了一个实验室研究的电荷分离的蒸汽生长的冰晶和目标之间的碰撞增长的riming，与微物理条件下的性能研究的无感机制类似的一些发生在层状区域的中尺度对流系统的目标。使用直径为2 mm的靶进行了一系列实验，环境温度在−7°C和−13°C之间，有效液态水含量在0.05和0.5 g m−3之间，空气速度在1和3 m s−1之间。电荷图的符号上的电荷转移的rimer作为环境温度和有效的液态水含量的函数，为每个速度。结果表明，当温度高于−10°C时，起霜靶带正电。当温度低于−10°C时，高液态水含量时充电为正，低液态水含量时充电为负。在所研究的条件下，每次碰撞的电荷转移的幅度范围从0.01到0.2 fC。这些结果的电气化过程的影响进行了讨论。
A laboratory investigation of the electric charge separated in collisions between vapor‐grown ice crystals and a target growing by riming is presented in this work, with the goal of studying the performance of the noninductive mechanism under microphysical conditions similar to some of those which occur in the stratiform regions of the mesoscale convective systems. A series of experiments were conducted by using a target of 2 mm in diameter, for ambient temperatures between −7°C and −13°C, effective liquid water content between 0.05 and 0.5 g m−3, and air speeds between 1 and 3 m s−1. Charge diagrams of the sign of the electric charge transfer on the rimer as a function of the ambient temperature and the effective liquid water content for each velocity are presented. The results show that the riming target charges positive for temperatures above −10°C. For temperatures below −10°C, the charging is positive for high liquid water content and negative for low liquid water content. The magnitude of the charge transfer per collision under the studied conditions ranges from 0.01 to 0.2 fC. The implications of these results to the electrification processes are discussed.