Abstract

A mathematical model for the formation of condensation aerosols from highly supersaturated vapor-air mixtures is presented. The model is suitable for systems with very high nucleation rates that result in aerosol mass densities >1 g/m³. It accounts for nucleation, non-isothermal condensation, coagulation and indirectly for coalescence of the newly formed particles. It applies kinetic theory to determine the nucleation rate and treats nucleation and coagulation in separate stages, but both are coupled with non-isothermal condensation. A statistical approach based on the Weibull function is used to estimate the size distribution of the droplets (particles). The model has been applied to study the formation of glycerol aerosols in Electronic Nicotine Delivery Systems. The model qualitatively reproduces the observed trend that the aerosol particle size decreases as the puff flow rate increases. Within the model framework, at lower puff flow rates higher particle concentrations occur leading to higher rates of coagulation which result in larger particle size aerosol.

Copyright © 2021 American Association for Aerosol Research

摘要

提出了从高度过饱和的蒸气-空气混合物形成冷凝气溶胶的数学模型。该模型适用于成核率非常高的系统，导致气溶胶质量密度 >1 g/m ³. 它解释了成核、非等温冷凝、凝结，并间接解释了新形成的颗粒的聚结。它应用动力学理论来确定成核速率，并在不同阶段处理成核和凝结，但两者都与非等温冷凝相结合。使用基于威布尔函数的统计方法来估计液滴（颗粒）的尺寸分布。该模型已应用于研究电子尼古丁传递系统中甘油气溶胶的形成。该模型定性地再现了观察到的气溶胶粒径随着抽吸流速增加而减小的趋势。在模型框架内，在较低的抽吸流速下，较高的颗粒浓度会导致较高的凝结速率，从而导致较大的颗粒尺寸气溶胶。

版权所有 © 2021 美国气溶胶研究协会