偶极-偶极电荷相互作用对粉尘凝聚的影响
Effect of dipole-dipole charge interactions on dust coagulation
摘要：
本研究探讨分形聚集体之间的偶极-偶极电荷相互作用对尘埃颗粒生长的影响。等离子体或辐射环境中的聚集体将具有分布在其延伸表面上的电荷，这导致带电颗粒的净偶极矩。一个自洽的N体代码被用来模拟相互作用的带电聚集体的动力学。聚集体由于碰撞和偶极-偶极静电相互作用而自由旋转。这些旋转在确定晶粒的生长速率和随后的几何形状（分形维数）方面是重要的。与以前的研究只考虑电荷偶极相互作用相比，发现带电颗粒比中性颗粒更有效地凝结，这是由于小聚集体优先掺入中等大小的聚集体结构。带电聚集体往往比中性聚集体更紧凑，其特征在于具有略高的分形维数。
英文摘要：
This study examines the effect that dipole-dipole charge interactions between fractal aggregates have on the growth of dust grains. Aggregates in a plasma or radiative environment will have charge distributed over their extended surface, which leads to a net dipole moment for the charged grains. A self-consistent N-body code is used to model the dynamics of interacting charged aggregates. The aggregates are free to rotate due to collisions and dipole-dipole electrostatic interactions. These rotations are important in determining the growth rate and subsequent geometry (fractal dimension) of the grains. In contrast to previous studies which have only taken charge-dipole interactions into account, like-charged grains are found to coagulate more efficiently than neutral grains due to preferential incorporation of small aggregates into mid-sized aggregate structures. The charged aggregates tend to be more compact than neutral aggregates, characterized by slightly higher fractal dimensions.
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