Gravity Spreading and Turbulent Dispersion of Pressurized Releases Containing Aerosols
Sudden release of a pressurized chemical results in instantaneous flashing of fraction of the chemical into vapor. If the pressure inside the tank or a pipeline falls very rapidly, much of the liquid fraction may be thrown into the vapor cloud as a result of vigorous boiling process. A gravity spreading and a turbulent dispersion model has been developed to determine the dispersion hazards of pressurized releases containing liquid aerosols. The gravity spreading model determines the initial lateral spreading of the vapor cloud. A thermodynamic equilibrium model is used to determine the evaporation of liquid aerosols, the mean density and temperature of the cloud. Finally, when the effects of gravity are small, the transition from the gravity spreading model to a turbulent diffusion model takes place. Results are presented for pressurized propane releases at various exit velocities and different initial aerosol mass fraction.
KeywordsLiquid Fraction Exit Velocity Atmospheric Dispersion Turbulent Dispersion Downwind Distance
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- Mudan, K.S. (1983) “Gravity Spreading and Turbulent Dispersion of Pressurized Releases Containing Aerosols,” Paper presented at the IUTAM Conference on Atmospheric Dispersion of Heavy Gases and Particles, August 29 - September 2, 1983, The Hague, The Netherlands.Google Scholar
- Raj, P.K. and Aravamudan, K.S. (1980) “Theoretical models supporting the design of ammonia spill experiments,” Report to the Fertilizer Institute, Washington, D.C., Arthur D. Little Report Reference 82315.Google Scholar