Mass, Momentum and Energy Transfer to/from Fractal-like Aggregates

这个项目的目标是确定标度律，这将是有用的定量分析涉及分形聚集体的运输现象。 这种结构是产生亚微米颗粒的气溶胶反应器中遇到的常见特征。 它们的形成在遇到高输出速率的工业反应器中是不可避免的。 PI将开发一种逻辑方法来计算标度律，这将把集群大小与传输速率联系起来，并为预测其属性提供更好的基础。这是一个具有重大实际意义的重要问题。 分形状团聚体代表了一类经常遇到的几何形状，一般的处理将是有意义的价值，特别是对于纳米粒子。 虽然解决方案可用于大类球形颗粒，但开发一种通用的分形颗粒处理方法将是一个重大进展。他们计划将他们的分析扩展到中等努森数的情况。 PI计划使用最近由其他人开发的准蒙特卡罗方法，以减少计算时间。

The objective of this project is to identify scaling laws that will be useful in the quantitative analysis of transport phenomena involving fractal aggregates. Such structures are a common feature encountered in aerosol reactors producing submicron particles. Their formation is inevitable in industrial reactors where high output rates are encountered. The PIs will develop a logical methodology for calculating the scaling laws, which will relate cluster size to transport rates and provide a better base for predicting their properties. The problem is an important one with significant practical implications. Fractal-like agglomerates represent a class of geometries frequently encountered, and a general treatment would be of significant value, especially for nanoparticles. While solutions are available for large classes of spherical particles, developing a general treatment for fractal-like particles would represent a major advance. They plan to extend their analysis to the regime of moderate Knudsen numbers. The PIs plan to use the Quasi-Monte Carlo method, recently developed by others, for reduction of computation time.