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Forced convection heat transfer of subcooled liquid nitrogen in a vertical tube

Tatsumoto, Hideki; Shirai, Yasuyuki*; Hata, Koichi*; Kato, Takashi; Futakawa, Masatoshi  ; Shiotsu, Masahiro*

Experimental research on forced convection heat transfer of subcooled liquid nitrogen ranging from the pressures of 0.3 MPa to its supercritical pressure is carried out for wide ranges of inlet temperature and flow velocity. The heat transfer coefficients in non-boiling region and the DNB heat fluxes are higher for higher flow velocity and higher subcooling. The heat transfer coefficients in the non-boiling region agree well with those by the Dittus-Boelter correlation, although they are unaffected by the flow velocity for $$Re$$ $$<$$ 8000. The lowest limits agree with those obtained for no forced flow. The correlation of DNB heat flux that can describe the experimental data is presented. The heat transfer characteristics of supercritical nitrogen can be predicted by authors'correlation.

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