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An Experimental Study on the Transition of Momentum Controlling Hydrogen Jet to Buoyant Jet  

Won, S.H. (School of Mechanical & Aerospace Engineering, Seoul National University)
Chung, S.H. (School of Mechanical & Aerospace Engineering, Seoul National University)
Kim, J.S. (Air Resources Research Center, Korea Institute of Science and Technology)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.16, no.1, 2005 , pp. 1-8 More about this Journal
Abstract
Transition of momentum-controlling hydrogen jet to buoyant jet is experimentally investigated in order to develop a prediction model for the moving trajectory of hydrogen leaked from hydrogen devices. In the experiments, room-temperature helium, that has a similar density to the hydrogen leaked from high pressure tank, is horizontally injected through a 4mm tube and its moving trajectory is visualized by the shadowgraph method. The moving trajectories are found to be parabolic, thereby exhibiting increasing influence of the buoyancy. In analyzing the experimental results, the vertical movement is assumed to be controlled by the buoyancy while the horizontal movement is controlled by the air entrainment caused by the initial momentum. The resealing based on this assumption yields a single curve fitting to the all experimental results.
Keywords
Vapor Cloud Explosion; Momentum Controlling Jet; Buoyant Jet; Shadowgraph;
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  • Reference
1 Schlichting, H., Boundary-Layer Theory, McGraw-Hill, New York, 1979
2 NIST, Thermodynamic and Transport Properties of Pure Fluids, 2000
3 김종수, 유해화학물질사고 국가비상대응정보시스템 (NERIS) 개발, 환경부, 2004
4 Center for Chemical Process Safety, Use of Vapor Cloud Dispersion Models, AlChE, New York, 1996
5 Puttock, J. : 'Comparison of Thomey Island Data with Predictions fo HEGABOXlHEGADAS,' J. Hazardous Materials Vol. 16. 1987, pp. 439-455   DOI   ScienceOn
6 Lihou, D. A. and Maund, J. K. : 'Thermal Radiation Hazard from Fireballs,' J. Chem. E. Symp. Ser. No. 171, 1982, pp. 191-225
7 Peters, N. and Gottgens, J. : 'Scaling of Buoyant Turbulent Jet Flames,' Combust. Flame Vol. 85, 1991, pp. 206-214   DOI   ScienceOn
8 이창훈, 한국형 실시간 확산모델 개발, 한국과학기술연구원, 2004
9 Center for Chemical Process Safety, Guidelines for Evaluating the Characteristics of Vapor Cloud Explostions, Flash Fires, and BLEVEs, AIChE, New York, 1994