The critical heat flux (CHF) in horizontal tube under low flow condition is investigated in this paper. It is found that the boiling crisis occurs at the upper surface of the horizontal tube. According to the exit quality and flow pattern, the category of boiling crisis in the horizontal tube under low flow is considered to be Dryout. The prediction results of Bowring correlation and Lookup table are much larger than the experimental data. Because the Bowring correlation and Lookup table are proposed for the CHF prediction of vertical round tube. The distribution of liquid film in horizontal annular flow is asymmetrical due to gravity. The non-uniform distribution of the liquid film reduces the CHF.

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