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Chemical and Petroleum Engineering

, Volume 53, Issue 1–2, pp 101–105 | Cite as

Estimation of Heat Flux Through Free Liquid Hydrogen Surface in Cryogenic Tanks with Supercharged Vapor Space

  • V. I. Ryazhskikh
  • A. A. Khvostov
  • A. V. Ryazhskikh
  • A. V. Ivanov
  • A. V. Kozlov
CRYOGENIC ENGINEERING, PRODUCTION AND USE OF INDUSTRIAL GASES, VACUUM ENGINEERING
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Synthesis of a mathematical model of cooling of supercharging gas in the vapor space of cryogenic tanks containing liquefied gas is studied. Based on the model of a unidimensional dynamic thermal boundary layer, it is shown that the heat flux through the free liquid hydrogen surface in the cryogenic tank having a vapor space supercharged with gaseous hydrogen is much less than the heat flux through a wetted surface. The operational process of supercharging vapor space with gaseous hydrogen is studied by the example of a commercial liquid hydrogen tank. An example of calculation that shows the procedure of calculation of specific heat fluxes is given. The calculation results show that in the working range of fractions of the vapor space the heat flux through the liquid surface is much less than the heat flux through a wetted surface and that the heat of the supercharging gas exerts practically no influence on the change in temperature of the cryogenic liquid during its storage in the tank.

Keywords

heat flux liquid hydrogen free and wetted surfaces cryogenic tank thermal boundary layer 

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • V. I. Ryazhskikh
    • 1
  • A. A. Khvostov
    • 1
  • A. V. Ryazhskikh
    • 1
  • A. V. Ivanov
    • 1
  • A. V. Kozlov
    • 1
  1. 1.Military Training and Research Center of Airforce – Zhukovskii and Gagarin Airforce AcademyVoronezhRussia

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