Heat Transfer Enhancement Using Concave And Ribbed Surfaces In Laminar Flows
In the present study, the heat transfer enhancement of laminar air flows over concave and ribbed surfaces have
been investigated experimentally in a wind tunnel. The experiments were performed over a flat plate, a curved surface with a
radius of 2.54 m in concave curvatures and a ribbed surface has a rib aspect ratio (the ratio of the rib width to the rib
height)of 1.2 for the free stream velocity of 2 m/s. A constant-temperature hot wire anemometer and copper-constant
thermocouples were used to the velocity and temperature measurements, respectively. The results show that the heat transfer
rates are increased up to 60% by the concave and 175% by the ribbed surface comparing to the flat plate. It is noted that ribs
give the higher heat transfer augmentation than concave surface.
Keywords — Heat Transfer Enhancement, Laminar Flow, Ribbed Surface, Concave Surface.