Validation of the QUIC droplet evaporation scheme and its influence on aerosol dispersion

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Tuesday, 19 January 2010: 11:15 AM
B308 (GWCC)
Dragan Zajic, LANL, Los Alamos, NM; and M. J. Brown, M. A. Nelson, and M. D. Williams

Presentation PDF (288.9 kB)

The Quick Urban and Industrial Complex (QUIC) model was developed to improve transport and dispersion modeling capabilities within urban areas. The modeling system has the ability to quickly obtain a detailed 3D flow field around building clusters and uses a Lagrangian random-walk approach to calculate dispersion fields. In certain cases, the pollutant is released into the atmosphere as droplets that evaporate with a rate depending on atmospheric conditions, e.g. relative humidity and temperature. The evaporation changes the droplet mass which then impacts its settling velocity. In this work we provide a description of the QUIC evaporation scheme and compare model output with other models reported in the literature as well as experimental measurements of change in water droplet diameter with time for different temperatures and relative humidity. The model is then applied to calculation of aerosol concentration and dosage fields and results are compared with work available in literature.