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《Chemical Engineering(China)》 2003-01
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Numerical Simulation Research on Instantaneous Release Dispersion of Heavy Gases

PAN Xu-hai, JIANG Jun-cheng (Nanjing University of Technology, Nanjing 210009, Jiangsu Province, China)  
In some release accidents, dense gases are formed, and its dispersion behaviour is more different from passive dispersion. Heavy gas dispersion mainly includes gravitational slumping, entrainment of air, cloud cluster heating and transition to the passive phase. The forward finite difference and Newton iterance are used in the light of box model and other heavy gas dispersion models, such as IIT Heavy Gas Models and virtual point source model, to solve the differential equations of controlling heavy gas cloud dispersion behaviour in order to simulate the Thorney Island Trial 008 to obtain the relationship between the shape character (cloud cluster radius and cloud cluster height) and the time after release, the relationship between air entrainment quality and the time after release and predict maximum mole component at various downwind distance on the ground level from the release point. The simulation results well reflect the special dispersion behaviour of heavy gas cloud. Analysis are made to interpret the difference between simulation results and experimental data, and the results indicate that the method which is used to simulate the dispersion behavior of heavy gas cloud is feasible and the precision is higher than that of IIT Heavy Gas Models.
【Fund】: 国家自然科学基金资助 ( 2 9936110 )
【CateGory Index】: X592
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