Journal
CRYOGENICS
Volume 51, Issue 6, Pages 295-299Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cryogenics.2010.05.004
Keywords
Hydrogen; Heat transfer; Forced flow; Phase transitions
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Heat transfer from inner side of a heated vertical pipe to liquid hydrogen flowing upward was first measured at the pressure of 0.7 MPa for wide ranges of flow rates and liquid temperatures. The heat transfer coefficients in non-boiling regime for each flow velocity were well in agreement with the Dittus-Boelter equation. The heat fluxes at the inception of boiling and the departure from nucleate boiling (DNB) heat fluxes are higher for higher flow velocity and subcooling. It was found that the trend of dependence of the DNB heat flux on flow velocity was expressed by the correlation derived by Hata et al. based on their data for subcooled flow boiling of water, although it has different propensity to subcooling. (C) 2010 Elsevier Ltd. All rights reserved.
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