Brownian Dynamics Simulation of theAggregation of Submicron Particles inStatic Gas
Brownian Dynamics Simulation of theAggregation of Submicron Particles inStatic Gas
复制标题
静态气体中亚微米颗粒聚集的布朗动力学模拟
DOI：
10.1016/j.compchemeng.2013.03.028
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Daisuke Tanaka
中科院分区：
文献类型：
--
作者：
Mariko Watanabe;Daisuke Tanaka
采用布朗动力学模拟方法研究了由煤烟等亚微米颗粒组成的聚集体的形成。考虑了三种聚集模型：扩散限制聚集模型，其中聚集体围绕固定颗粒生长;颗粒-簇聚集模型，其中单个聚集体通过颗粒与聚集体之间的碰撞而生长;以及簇-簇聚集（CCA）模型，其中许多颗粒和聚集体形成多个聚集体。三个聚集模型的比较表明，CCA模型导致在一个烟灰样的分支形状。采用CCA模型研究了聚集体的形成，确定了气体温度的升高通过改变布朗粒子的位移和速度来影响聚集体分支的屏蔽效果。此外，这些模拟表明，场的大小和纵横比以及颗粒密度也影响聚集形状。
A Brownian dynamics simulation was conducted to investigate the formation of aggregates that are composed of submicron particles such as soot. Three models were considered for aggregation: a diffusion-limited aggregation model, in which an aggregate grows around a fixed particle; a particle–cluster aggregation model, in which a single aggregate grows by collisions between particles and the aggregate; and a cluster–cluster aggregation (CCA) model, in which many particles and aggregates form multiple aggregates. A comparison of the three aggregation models showed that the CCA model resulted in a soot-like branching shape. The aggregation was investigated by employing the CCA model; it was determined that increase in gas temperature affected the shielding effect of the aggregate branch by changing the displacement and velocity of Brownian particles. Furthermore, these simulations demonstrated that the size and aspect ratio of the field and the particle density also affected aggregation shape.