A square channel of a geometry commonly used in heavy-duty gas turbine blade as forced convection cooling channel was experimentally studied. The effect of Reynolds number

wall heat flux and mist mass flow rate on the heat transfer characteristic of mist/steam cooling channel wall were analyzed. A experimental correlation of heat transfer was developed to account for mist flow working conditions and channel wall heating conditions. Results show the heat transfer coefficient of mist/steam two-phase flow is significantly higher than the pure steam. Heat transfer performance of mist/steam decreases with increasing of heat flux and increases with increasing of Reynolds number and mist mass flow ratio. The average heat transfer coefficient of upper wall surface is lower 13% than bottom wall surface under higher heat flux and lower mist mass flow ratio

while in the case of low heat flux and high mist mass flow ratio

this ratio increases to approximately 25%.