Heat Transfer of Two Circular Cylinders Fixed on a Plane Wall Aligned in a Cross-Flow of Air

The heat tranfer of two circular cylinders fixed on a plane wall has been investigated in a cross-flow of air. The turbulent boundary layer thickness along the wall with no cylinder present was about 21 mm. The test cylinder diameter (d) was 15-15.3 mm, and the pitch (p) between the two cylinders was 16.5-66 mm (p/d=1.1-4.4). The Reynolds number (Re) based on the undisturbed uniform flow velocity above the wall ranged from 9 000-40 000. In this paper, variations in the characteristic features of the local and mean Nusselt numbers are discussed in relation to the value p/d and Re, with the pressure distributions around each cylinder and the features of the flow field investigated.