AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
Estimates of Non-Ideal Effects on the Agglomerate Dynamics
WEONGYU SHIN, George Mulholland, Seong C Kim, Jing Wang, Jacob Scheckman, David Pui, Chungnam National University
Abstract Number: 738 Working Group: Aerosol Physics
Abstract Several characteristics of silver agglomerates are not incorporated in existing models for agglomerate dynamics. Existing models assume chain-like agglomerates with open structure. Silver agglomerates can be aligned in the electric field and have necking between primary particles. Primary particles on silver agglomerates are polydisperse and the primary sphere size are variable. Estimates of these features on the agglomerate dynamics were computed as perturbations to the Chan-Dahneke agglomerate model. The variable primary sphere size effect results in the largest change from the idealized model with about a 10% increase in scaling exponents for both friction coefficient – number of primary particles (η) and mass-mobility diameter (Dfm). The second largest change is a 4% decrease in the exponent η and a 4% increase in the exponent (Dfm) from the alignment in the electric field. The effects of necking between particles and polydispersity of the primary particles are negligible for the two exponents. Adjusting the model by this amount provides a significant improvement in the agreement between the model and silver agglomerate measurements for the dynamic shape factor.
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2012-0004006).