Research of determinant law of boiling heat transfer enhancement in rectangular narrow channel

A determinant law was built to study the heat transfer enhancement in rectangular narrow channel with water when the Critical Heat Flux (CHF) was happening. According to the flow passage characteristic of rectangular narrow channel and the annular flow predicted analytical model of CHF in round tube, the annular flow CHF analytical model in rectangular narrow channel was established. This model can be used in prediction of the CHF of boiling two-phase flow annular flow in rectangular narrow channel in which the gap length is not less than 0.5 mm. According to the characteristics of two-phase flow, the new determinant law of CHF in boiling two-phase flow system was derived. The analysis and calculation show that this determinant law is appropriate, and can be applied to the determination of the heat transfer enhancement in rectangular narrow channel with high Reynolds number when CHF is happening under forced flow.