Generation of High Concentration Aerosol Particles with Controllable Size Distribution and Effects of Size Distribution on the Loading Characteristic
Date Issued
2004
Date
2004
Author(s)
Chang, Kuang-Nan
DOI
zh-TW
Abstract
A variety of aerosol generators have been developed to produce aerosols with different size distribution. Most of these aerosol generators can only be modified to produce aerosols of different count median diameter (CMD) with about the same geometric standard deviation (GSD). Although an ultrasonic atomizing nozzle had been modified to become a universal size-distribution aerosol generator, the aerosol number concentration was too low for some applications, such as aerosol loading tests. Therefore, the main purpose of the present study was to develop a high concentration aerosol generator which is capable of generating various size distributions.
In this study, a condensation monodisperse aerosol generator (Model 3475, TSI Incorporated, St. Paul, MN) was chosen as the core of the aerosol generating system, and the paraffin was used as the test agent. By using electromagnetic valves controlled by a computer, we were able to manipulate the air flows through saturator and filter units, to control the amount of vapors and the number of nuclei, respectively. By changing the cycle time of different combination of air flows, a universal size-distribution aerosol generator was made possible, including a fixed CMD with changeable GSD. For example, monodisperse aerosols with size ranging from 0.3 to 3
Subjects
微粒產生器
微粒負載
Loading
Aerosol Generator
Type
thesis