Abstract
Experiments have been performed for a turbulent channel flow obstructed with an airfoil type turbulence promoter. The clearance between the wall and airfoil is changed in three steps. The total performance evaluation between heat transfer and pressure drop was estimated under the conditions of an equal pumping power. PIV is used for the measurements of velocity profiles and turbulent intensity. When the clearance is small, the heat transfer coefficient is augmented by the reverse flow in the near-wall region and the increase of turbulence intensity.
