Control of Turbulent Channel Flow over a Backward-Facing Step by Suction
Details
A turbulent channel flow over a backward-facing step is investigated experimentally. In earlier paper, the authors reported that enhancement of the heat transfer was attained by suction through a slit at the bottom corner of the step. In this case, suction was made horizontal direction to the main flow. In present study, the direction of suction is changed from horizontal to perpendicular. The suction flow ratio is varied from 0.00 to 0.15. The wall static pressure and local heat transfer coefficient are measured behind the backward-facing step. The wall shear stress is measured using the micro flow sensor. The heat transfer characteristic is improved in the way of perpendicular suction as compared with horizontal suction. When the suction flow ratio is 0.05, the highest performance is obtained.
