Study on Turbulent Channel Flow with Suction through a Slit

Experiments have been performed on turbulent channel flow with suction through a slit. The inclined angle of the suction is changed 30°, 60°and 90°at the main stream velocity 10m/s. The dimensionless suction flow ratio is varied nine steps in the range of 0.067-0.500. In order to investigate the relationship between fluid flow and heat transfer characteristics, local heat transfer coefficient, wall static pressure, wall shear stress, velocity profile and turbulence intensity are measured. In addition, the velocity profiles of the suction region are measured by the particle image velocimetry (PIV). Difference due to the inclined angle is not observed in the result of wall pressure and heat transfer coefficient. The heat transfer coefficient decreases as the suction flow ratio increases. The recovery mechanism of turbulence is greatly different between the lower side and upper side of the channel.