Titlebook: Atmospheric Dispersion of Heavy Gases and Small Particles; Symposium, Delft, Th Gijsbert Ooms,Hendrik Tennekes Conference proceedings 1984

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Temperature Measurements in a Negatively Buoyant Round Vertical Jet Issued in a Horizontal Crossfloormed in a flume: fresh water is emitted vertically through warm water. Temperature measurements are undertaken along verticals in the jet axis. It is found that the mean temperature values can be plotted as similarity diagrams. Some experimental correlations are deduced for the maximum height of je

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Gravity Spreading and Air Entrainment by Heavy Gases Instantaneously Released in a Calm Atmosphere, Effects of volume released (34, 54, and 135 liters), initial density (2.19, 2.95, and 4.27 relative to air), and initial volume height-to-diameter ratio (0.4, 1.0, and 1.6) are reported. Ground level peak gas concentrations measured are compared with previously reported smaller scale experimental m

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A Wind Tunnel Model of the Porton Dense Gas Spill Field Trials,rtaken to assess the validity of the wind tunnel modelling technique as a dispersion prediction method [1]. The comparative data used was that obtained from the field trials carried out at Porton Down in 1976/7. In addition a number of scaling experiments were carried out in order to further investi

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The Entrainment of Small Particles by a Turbulent Spot,recorded using high-speed photography (at 2000 frames/s). Scanning the films using a motion-analyser shows several types of particle movement and the measured entrainment velocities and heights indicate the particles stay within the spot structure.

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Verwendete Materialien und Software dimensionless entrainment is a universal function of the local Richardson number. It is found that some experiments do not conform to this hypothesis, most likely because of the vigorous initial mixing of the cloud. An empirical mixing law is proposed for this early stage which does not violate energy conservation.