Hazard and Risk 17
Hazard and Risk 17 : Releases and Dsperions: Behaviour of Releases: (1) Instantaneous Release: The escape of a specified quantity of a hazardous substance over a short time span typically a few seconds. (2) Continuous Release: The escape of a hazardous substance at a flow rate, which is sustained for a prolonged period. (3) Flashing Flow: Two phase flow in the leak path of a release of super-heated liquid. (4) Flash Fraction: The fraction of a superheated liquid that will vaporise under adiabatic conditions on depressurisation to atmospheric pressure. (5) Momentum Turbulence: Turbulence induced by the speed with which the material is injected into the surrounding fluid. (6) Regression Rate: The rate of decrease in depth of a liquid pool. (7) Source Term: The quantitative description of a release required as input to a consequence model, i.e. quantity or rate, concentration, temperature, density, etc.
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