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An Analytical Solution for the Polymeric Liner Collapse in Hyperbaric type IV Hydrogen Storage Vessels

Alizadeh, Mostafa | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53442 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Naghdabadi, Reza
  7. Abstract:
  8. Type IV high pressure vessels are composite vessels with a polymeric liner, which are the best choice for storing hydrogen in hydrogen vehicles. The defect of these vessels is the penetration of light hydrogen molecules in the polymeric liner and the composite part. When depressurization the vessel, these molecules cannot release from the polymeric liner and the composite part according to the emptying rate of the vessel. Thus, concentration of the hydrogen molecules in the polymeric liner becomes more than inside the vessel which leads to a pressure difference between the two sides of the polymeric liner that causes the liner collapse. In this research, the partial differential equation for the penetration/diffusion of hydrogen molecules in/from the polymeric liner is analytically solved. By solving this differential equation, the concentration equation in the polymeric liner is derived and the pressure difference equation between two sides of the liner is obtained. Considering the collapse (buckle) of the polymeric liner of type IV hydrogen storage vessel, the critical pressure equations of Glock and El-Sawy have been used to calculate the critical pressure of the polymeric liner. By combining the equation of the pressure difference between two sides of the polymeric liner is derived with either of the critical pressure equations of Glick or El-Sawy, the governing model for the polymeric liner collapse is presented. This model makes it possible to investigate the effect of the thermodynamics parameters (initial pressure, final pressure, emptying rate and depressurization time), mechanical properties (Poisson’s ratio and elasticity modules) and geometrical specification (external diameter and thickness of the liner) on the polymeric liner collapse. Next, using the liner collapse model, effects of the Poisson’s ratio on the safe emptying rate as well as polymeric liner collapse of the type IV hydrogen storage vessel is investigated. According to the results, by increasing the Poisson’s ratio from 0.25 to 0.45, the liner strength against collapse is increases by 20%. In addition, utilizing the liner collapse model, the collapse critical thickness of the polymeric liner has been calculated
  9. Keywords:
  10. Type IV Hydrogen Storage Vessels ; Polymeric Liner ; Polymeric Liner Collapse Equation ; Penetration/Diffusion Hydrogen ; Hydrogen Storage ; Composite Vessel

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