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Analysis and Test of Compressed Hydrogen Interface Leakage by Commercial Stainless Steel (NPT) Fittings
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 03, 2006 by SAE International in United States
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With the stringent emission regulations and renewable energy concerns, hydrogen application either to direct injection combustion or fuel cell application attracts more attention. However, a major obstacle for vehicle utilization of hydrogen as a main fuel is onboard storage. Due to the low mass density, hydrogen has the lowest energy per unit volume among all potential fuels. One of the typical methods to store hydrogen is in very high pressure storage tanks. The high pressure (35 MPa and higher) combined with small size of hydrogen molecules makes the tanks and adjacent fittings prone to leakage, which may cause important potential safety issues, given the wide combustion range and easy ignition of hydrogen.
Our research focuses on characterizing the relative importance of basic modes of hydrogen leakage at the joints of commercial stainless steel fittings. Two types of fittings that include National Pipe Thread Standard (NPT) screw treads and standard compression fitting ferrules are modeled as a capillary duct with the same hydraulic diameter (height of the duct). The flow rate through the contacting faces is determined and correlated to the differential pressure drop, thread treatment, torque, and temperature. The analytical models from the viscous flow regime to free-molecular flow regime are derived. We compare the analytical formulation in the slip flow regime with previous experimental results for nitrogen and helium, and then apply this analytical model to predict the hydrogen leakage at the high pressure ratio condition. An experiment extending these results to hydrogen is also reported in the paper, and the results are compared with the analytical prediction.
CitationGe, X. and Sutton, W., "Analysis and Test of Compressed Hydrogen Interface Leakage by Commercial Stainless Steel (NPT) Fittings," SAE Technical Paper 2006-01-0130, 2006, https://doi.org/10.4271/2006-01-0130.
- Tamura Y. Suzuki J. Watanabe S. “The Fire Tests with High-Pressure Hydrogen Gas Cylinders for valuating the Safety of Fuel-Cell Vehicles” SAE Technical Paper 2004-01-1013
- Takahashi M. Tamura Y. Suzuki J. Watanabe S. “Investigation of the Allowable mount of Hydrogen Leakage Upon Collision” SAE Technical Paper 2005-01-1885
- Khayyat Y. Unnasch S. “Hydrogen Fuel Cell Vehicle Safety in buildings” SAE Technical Paper 2005-01-1889
- Chernicoff W. et al. “Characterization of leaks from compressed hydrogen systems and related components” DOT-T-05-01 Jan 2005
- Schaaf S. Chambre P. “Flow of Rarefied Gases.” Princeton University Press 1961
- Bird GA “Definition of mean free path for real gases.” Phys Fluids 26 3222 3223 1983
- Beskok A. Karniadakis G. “Simulation of heat and momentum transfer in microgeometries,” 1993 AIAA Paper 93-3269
- Beskok A. Karniadakis G. “A MODEL FOR FLOWS IN CHANNELS PIPES, AND DUCTS AT MICRO AND NANO SCALES” Microscale Thermophysical Engineering 3 43 77 1999
- Beskok A. Karniadakis G. Trimmer W Rarefaction and compressibility effects in gas microflows J Fluids Eng 118 448 456 1996
- Karniadakis GE Beskok A. Microflows: fundamentals and simulation Springer-Verlag Berlin Heidelberg New York 2002
- Arkilic E.B., Breuer K.S. Schmit M.A. Gaseous flow in microchannels Application of Microfabrication to Fluid Mechanics 1994 Chicago, IL 57 66
- Arkilic, E. B. Schmidt, M. A. Breuer, K. S. 1997 “Gaseous slip flow in long microchannels” J. Microelectromech. Systems 6 167 178
- Arkilic, E.B “Gaseous Flow in Micron-Sized Channels” MIT Jan. 1994
- Hsieh S.S. Tsai H.H. Lin C.Y. Huang C.F. Chien C.M. Gas flow in long micro-channel Int. J. Heat Mass Transfer 47 2004 3877 3887
- Harley J.C. Huang Y. Bau H.H. Zemel J.N. “Gas flow in micro-channels” J. Fluid Mech. 284 1995 257 274
- Araki T. Kim M.S. Iwai H. Suzuki K. “An experimental investigation of gaseous flow characteristics in microchannels” Microscale Thermophys. Eng. 6 2002 117 130
- Piekos E. S. Breuer K. S. “DSMC Modeling of Micromechanical Devices” AIAA Thermophysics Conf. June 1995 San Diego, CA
- Ohwada T. Sone Y. Aoki K. “Numerical analysis of the Poiseuille and thermal transpiration flows between two parallel plates on the basis of the Boltzmann equation for hardsphere molecules,” Phys. Fluids A 1 2042 1989
- Aoki K. “Dynamics of Rarefied Gas Flows: Asymptotic and Numerical Analyses of the Boltzmann Equation” AIAA 2001-0874
- Basmadjian D. “Mass Transfer Principles and Applications” CRC Press 2003
- Chenoweth, D.R. Sandia National laboratories Report 83-8299 1983
- White, F. “Viscous Fluid Flow” Macgraw-Hill International Editions 1991
- Incropera F.P et al. Fundamentals of Heat and Mass Transfer John Wiley & Sons 2002