Start
Jan 24, 2013 - 17:00
End
Jan 24, 2013 - 18:00
Venue
Room 118 (Creativity Hall) Ground Floor Chemical Engineering Department
Event Type
Speaker
Dr. Y S Mayya Ex-Head Radiological Physics and Advisory Division BARC
Title
Coagulation modelling of dispersing nanoparticle aerosols released from continuous sources
Aerosols released from anthropogenic sources are of considerable concern in the context of radiative forcing and public health. These sources are generally characterized by mass emission factors. However both from optical and health effect point of view it is important to assess the number loading factors in the far field domains. The process of coagulation of the nanoparticles formed near the sources coupled with inevitable atmospheric dispersion are the fundamental mechanisms of transformation of aerosols as they spread over far field regions. Since the coagulation effects dominate essentially near the source it is useful to develop analytical correlations for the number survival fractions which may be incorporated as source modifier terms in large scale aerosol transport models. Towards this end we explore analytical approximations to predict practically relevant persisting aerosol metrics for the cases of both localized and spatially homogeneous releases. The presentation throws insights into various asymptotic laws of aerosol behaviour especially the effect of ventilation for continuous emissions in indoor environments