Abstract Although aerosols in some postaccident nuclear environments can be nonspherical, chainlike, or agglomerates, there have been limited investigations of the rate processes (such as coagulation, evaporation, condensation, and deposition) involving such particles. In a previous investigation, the understandings of condensation and evaporation on such particles were expanded through use of a one-speed approximation for modeling vapor (or fission product) molecular transport, and the present paper extends that work to energy- and mass-dependent transport of vapor molecules within the context of the linear Boltzmann equation via the Monte Carlo particle transport method for rigid sphere molecules. The results are benchmarked against available numerical results and experimental data for a single sphere, and it is found again that the normalized condensation rate has only a weak dependence on the molecular mass ratio (vapor to background) and that the one-speed approximation is quite good. Results are reported for a range of chainlike and agglomerate aerosols.

中文翻译：

---

链状气溶胶和团聚体裂变产物凝聚的计算——II：分子的能量和质量依赖性的作用

摘要 尽管一些事故后核环境中的气溶胶可能是非球形、链状或团块，但对涉及此类粒子的速率过程（如凝结、蒸发、冷凝和沉积）的研究有限。在之前的一项研究中，通过使用单速近似来模拟蒸汽（或裂变产物）分子传输，扩展了对此类粒子冷凝和蒸发的理解，而本文将这项工作扩展到依赖于能量和质量的传输通过刚性球体分子的蒙特卡洛粒子传输方法，在线性玻尔兹曼方程的上下文中对蒸汽分子进行分析。结果以单个球体的可用数值结果和实验数据为基准，并且再次发现归一化的缩合速率对分子质量比（蒸气与背景）的依赖性很小，并且单速近似非常好。报告了一系列链状和附聚气溶胶的结果。