Experimental Investigation on Critical Heat Flux in Horizontal Tube

The critical heat flux（CHF） in the horizontal tube under low flow condition is investigated in this paper. It is found that the boiling crises occur at the top of the tube. According to the exit quality and flow pattern, the category of boiling crisis in the horizontal tube 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 vertical round tube CHF prediction. The distribution of liquid film in the horizontal annular flow is asymmetrical due to gravity. It causes the dryout of liquid film at the top of tube early and the decreasing of CHF.