电荷-偶极相互作用对分形聚集体凝聚的影响
Effects of the Charge-Dipole Interaction on the Coagulation of Fractal Aggregates
摘要：
本文提出了一个适用于复杂（尘埃）等离子体的数值模型。自洽的N-体代码允许模拟分形聚集体的凝聚，包括由于聚集体上电荷的空间排列而引起的簇的电荷-偶极相互作用。结果表明，不仅人口的带相反电荷的颗粒增加凝聚速率，包括电荷偶极相互作用的聚集体以及电偶极子电位的尘埃合奏减少凝胶化时间的一个因素，高达20。它进一步表明，这些相互作用也可以刺激凝胶化的发生，或“失控的增长，”即使在人口的颗粒充电到一个单电位，以前人们认为，带电荷的晶粒会抑制凝固。据观察，由于形成的高质量的聚集体的分形维数大于2，作为种子失控的增长。
英文摘要：
A numerical model with broad applications to complex (dusty) plasmas is presented. The self-consistent N-body code allows simulation of the coagulation of fractal aggregates, including the charge-dipole interaction of the clusters due to the spatial arrangement of charge on the aggregate. It is shown that not only does a population of oppositely charged particles increase the coagulation rate, the inclusion of the charge-dipole interaction of the aggregates as well as the electric dipole potential of the dust ensemble decreases the gelation time by a factor of up to twenty. It is further shown that these interactions can also stimulate the onset of gelation, or "runaway growth," even in a population of particles charged to a monopotential where previously it was believed that like-charged grains would inhibit coagulation. Gelation is observed to occur due to the formation of high-mass aggregates with fractal dimensions greater than two which act as seeds for runaway growth.
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