Aerosol Retention in the Vicinity of a Breach in a Tube Bundle: An Experimental Investigation

作者：Sanchez Velasco F J; Lopez Del Pra C; Herranz Luis E^*

来源：Aerosol Science and Technology, 2010, 44(5): 349-361.

DOI：10.1080/02786821003652638

This article summarizes the main results of a bench-scale program focused on experimentally assessing the aerosol retention near the tube breach in a tube bundle. The major variables investigated were particle nature (polydispersed TiO(2) agglomerates vs. solid, monodisperse SiO(2) spheres) and Re(D) (0.8-2.7 +/- 10(5)). In addition, comparisons to other data sets provided insights into the particle aerodynamic size effect on retention efficiency. Results showed that particle nature substantially affects aerosol retention in the tube bundle: mass retention efficiency was low for TiO(2) agglomerates (less than 30%) whereas it was much higher for SiO(2) particles (around 85%). Retention efficiency is also affected by Re(D): its sensitivity was found to follow a log-normal behavior with a maximum retention attained at Re(D) near 1 +/- 10(5). This evolution with Re(D) was similar for both types of compounds. Particle size also influences retention efficiency: the bigger the TiO(2) agglomerates the lower retention efficiency (no data were available for SiO(2)). Among all these variables, particle nature was noted to have a prime importance for in-bundle retention, whereas Re(D) and particle aerodynamic size, although also affect retention efficiency, did not play such a key role. In light of the results, the presence of retention-inhibiting mechanisms such as fragmentation, resuspension or bouncing has been discussed. The data recorded will enhance the overall understanding of the governing mechanisms involved and will serve as a database against which compare model predictions. Nevertheless, further experimental data would be desirable to set up a sound database.

• 出版日期2010