10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Effect of Time on Particle Resuspension from Substrates: Wind-tunnel Experiment and Analysis
Babak Nasr, JING QIAN, Morgan Minyard, Andrea R. Ferro, Goodarz Ahmadi, Suresh Dhaniyala, Clarkson University
Abstract Number: 1078 Working Group: Aerosol Physics
Abstract Airflow-driven particle resuspension from surfaces plays an important role in indoor and outdoor air quality. The characteristics of particle removal from a substrate depend on particle size and morphology, substrate roughness, relative humidity, and flow field near the wall. The influence of these factors on the particle resuspension rates has been considered to varying extents in existing experiments and models. The current experimental studies, however, do not extensively account for the effect of time on article resuspension. In most resuspension processes, particles experience unsteady or intermittent airflow, and it is critical to consider the time-dependence of particle removal. In this study, set of wind-tunnel based particle resuspension experiments are conducted to evaluate the detachment fraction of particles as a function of time with controlled air flow. The influence of flow rate conditions -e.g., constant and stepping flow rate- on particle removal rate are investigated in our experiment focusing on micron-sized particles. Also, a semi-empirical model is described for time-dependent particle removal from surfaces exposed to turbulent flow. The model is derived based on a combination of experimental data reported in the literature and those obtained in our lab. In our presentation, we will describe the experimental procedure and the model development approach to validate the developed model.