A three-dimensional one-channel model was established

the effect of corrugated clination angle and corrugated pitch on heat transfer and pressure drop of phase change flow was simulated. The results show that the heat transfer characteristics of the flow boiling are affected by both the flow pattern and the contact point. The “helical flow” promots evaporation of liquid film

and the contact point has less effect on gas than liquid

therefore

the phenomenon of gas-liquid phase transition is not obvious at the higher gas volume fraction. The heat transfer coefficient increases with the increasing of the corrugated inclination angle

and decreases with the increasing of the corrugated pitch. The heat transfer coefficient of λ=16 mm is larger than that of λ=14 mm at same Reynolds number

because the change of the flow pattern may prevent the heat transfer caused by the reduction of the number of contacts. The heat transfer is the best at β=75° and λ=10 mm.The pressure drop of the flow boiling increases at first and then decreases with the increasing of the corrugated inclination angle

and reaches the peak at about β=65°

and decreases with the increasing of the corrugation pitch.