Integrated numerical prediction of atomization process of liquid hydrogen jet

Jun Ishimoto, Katsuhide Ohira, Kazuki Okabayashi, Keiko Chitose

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

The 3-D structure of the liquid atomization behavior of an LH2 jet flow through a pinhole nozzle is numerically investigated and visualized by a new type of integrated simulation technique. The present computational fluid dynamics (CFD) analysis focuses on the thermodynamic effect on the consecutive breakup of a cryogenic liquid column, the formation of a liquid film, and the generation of droplets in the outlet section of the pinhole nozzle. Utilizing the governing equations for a high-speed turbulent cryogenic jet flow through a pinhole nozzle based on the thermal nonequilibrium LES-VOF model in conjunction with the CSF model, an integrated parallel computation is performed to clarify the detailed atomization process of a high-speed LH2 jet flow through a pinhole nozzle and to acquire data, which is difficult to confirm by experiment, such as atomization length, liquid core shape, droplet-size distribution, spray angle, droplet velocity profiles, and thermal field surrounding the atomizing jet flow. According to the present computation, the cryogenic atomization rate and the LH2 droplets-gas two-phase flow characteristics are found to be controlled by the turbulence perturbation upstream of the pinhole nozzle, hydrodynamic instabilities at the gas-liquid interface and shear stress between the liquid core and the periphery of the LH2 jet. Furthermore, calculation of the effect of cryogenic atomization on the jet thermal field shows that such atomization extensively enhances the thermal diffusion surrounding the LH2 jet flow.

Original languageEnglish
Pages (from-to)238-247
Number of pages10
JournalCryogenics
Volume48
Issue number5-6
DOIs
Publication statusPublished - 2008 May 1

Keywords

  • Atomization
  • Jet
  • Liquid hydrogen
  • Multiphase flow
  • Tank leakage

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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