A Unified Model for Jet, Heavy, and Passive Dispersion Including Droplet Rainout and Re-Evaporation

摘要

The Unified Dispersion Model (UDM) models the dispersion following a ground-level or elevated two-phase unpressurized or pressurized release. It allows for continuous, instantaneous, constant finite-duration, and general time-varying releases. It includes a unified model for jet, heavy and passive two-phase dispersion including possible droplet rainout, pool spreading and re-evaporation. It calculates the phase distribution and cloud temperature using either a nonequilibrium thermodynamics model, a non-reactive equilibrium model, or an equilibrium model specific for HF (including effects of polymerization).