Abstract

Particle morphology can affect the performance of an electrostatic precipitator air–liquid interface (ESP-ALI) cell exposure system and the resulting cell toxicity. In this study, three types of monodisperse aerosols – spherical sucrose particles, nonspherical align soot aggregates, and nanosilver aggregates/agglomerates – were selected to evaluate the collection efficiency at flow rates ranging from 0.3 to 1.5 lpm. To quantify the particle morphology, the fractal dimensions (D_f) of the tested aerosols were characterized. The penetration of fine particles (d_p = 100–250 nm) under different operating conditions was correlated with a characteristic exponential curve using the dimensionless drift velocity (V_c/V_avg,r) as the scaling parameter. For nanoparticles (NPs, d_p <100 nm) with different particle morphologies, the particle penetrations in the ESP-ALI were similar, but their diffusion losses were not negligible. In contrast, for fine particles, the collection efficiency of soot nanoaggregates (D_f = 2.29) was higher than that of spherical sucrose particles. This difference might be due to the simultaneous influences of the electric field-induced and flow field-induced alignment. Furthermore, based on Zhibin and Guoquan’s Deutsch model, a quadratic equation was applied to fit the experimental data and to predict the performance of the ESP-ALI.

摘要

颗粒形态会影响静电除尘器气液界面 (ESP-ALI) 细胞暴露系统的性能和由此产生的细胞毒性。在这项研究中，选择了三种类型的单分散气溶胶——球形蔗糖颗粒、非球形排列烟灰聚集体和纳米银聚集体/团聚体——以评估流速范围为 0.3 到 1.5 lpm 时的收集效率。为了量化颗粒形态，表征了测试气溶胶的分形维数 ( D _f )。微粒（的渗透d _p = 100-250 不同的操作条件下纳米）使用无量纲漂移速度（一种特征指数曲线相关V _Ç / V_avg,r ) 作为缩放参数。对于纳米颗粒（NP， d _p <100 纳米）具有不同的颗粒形态，在ESP-ALI粒子穿透相似，但它们的扩散损失不能忽略。相比之下，对于细颗粒，烟灰纳米聚集体 ( D _f = 2.29)的收集效率高于球形蔗糖颗粒。这种差异可能是由于电场诱导和流场诱导对齐的同时影响。此外，基于志斌和国权的 Deutsch 模型，应用二次方程拟合实验数据并预测 ESP-ALI 的性能。