Experimental Investigation on the CHF of Rectangular Channel with Narrow Gap under High Mass Velocity

An experiment, focused on the down flow CHF in rectangular channel with narrow gap, was performed under high mass velocity and low outlet pressure. The results show that CHF almost linearly goes up while mass velocity is increased, and while the exit quality rises, CHF falls down. The prediction of Sudo correlation underestimates experimental data. When inlet parameter is the same, the length of rectangular has little effect on CHF; but when the exit parameter is considered, the longer the channel is, the lower CHF is.