• Title/Summary/Keyword: Pseudo-flash-boiling

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Temperature Distribution of Liquid Nitrogen Jet at Sub- and Supercritical States (아임계 및 초임계에서 액체 질소 분류의 온도 분포)

  • Lee, Hyunchang;Kim, Haisol;Cho, Seongho;Sung, Hong-Gye;Yoon, Youngbin
    • Journal of the Korean Society of Propulsion Engineers
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    • v.22 no.1
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    • pp.1-6
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    • 2018
  • Temperatures of cryogenic nitrogen jet inside an injector and at three different downstream positions (0.9, 10.6, and 28.1d) were measured with thermocouples in sub- and supercritical states. The jet temperature decreased while cooling the supply line and injector. The jet experienced from flash boiling, boiling and then no boiling according to decreasing temperature. As an analogy to flash-boiling at the subcritical state, pseudo-flash boiling has been assumed considering the existence of pseudo-boiling at the supercritical state. By showing an area where the temperature did not increase downstream, the plausibility of pseudo-flash boiling is proposed.

Backlight image of liquid nitrogen jet at supercritical state (초임계에서 액체 질소 분류의 역광 사진)

  • Lee, Hyunchang;Yoon, Youngbin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2017.05a
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    • pp.709-712
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    • 2017
  • Liquid nitrogen jet has been imaged by using backlight method. In addition to the images, simultaneously measured temperature by thermocouples has been used to investigate the role of 'Pseudo-flash-boiling' in breakup of the supercritical jet. The backlight image can provide qualitative appearance of the jet, but not the density profile for the high density of injected fluid.

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