Heat transfer of a downstream cylinder of two circular cylinders near a plane wall in a cross flow of air. In case of pitch ratio P/D=1.2.

Abstract

The heat transfer of a downstream cylinder of two circular cylinders above 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 cylinder diameter (d) was 15-15.3 mm and the clearance (c) between the cylinder and the wall was 0.76-61 mm (c/d=0.05-4.0) under a constant pitch ratio p/d=1.2 (p denotes the distance between two cylinders). The Reynolds number (Re) based on the undisturbed uniform flow velocity above the wall ranged from 9, 000-40.000. Variations in the characterestic features of the local and mean Nusselt numbers are discussed in relation to c/d and Re, with the pressure distributions around the cylinder.