| Popis: |
Aerosol particle scavenging by droplets is commonly seen in workplaces as a process of air depollution, but it is used in an empirical way. Although many studies have been conducted on this process, there is still a lack of data concerning its efficiency in the field of occupational health. Thus, an experimental study is presented in this paper, where a mist is sprayed in counter-current to an ascending aerosol of alumina using commercial nozzles. The influence of various parameters on the spectral and total collection efficiency is studied. It is put in evidence that the collection of particles above the micron takes place mainly on the first tens of centimeters. Although an increase in the liquid flow rate and the positioning height lead to a better collection efficiency, the droplet diameter seems to be a predominant parameter to take into account. From the results, recommendations are thus proposed to optimize the aerosol collected by droplets. It is also shown that a simple impaction model can be used to predict the scavenging of aerosol particles, despite the strong assumptions. |
Full Text from ScienceDirect