Abstract
Measurements were made of the heat transfer from horizontal wires and cylinders to air in the case of a vibrating wire and of wires and cylinders of various diameters in a smooth and in a turbulent air flow of known intensity and scale of turbulence. The Reynolds numbers ranged from 60 to 25 800, the intensity of turbulence from 2% to 13% and the ratio between the integral scale of turbulence and cylinder diameter from 0.31 to 240. The results show how the ratio between the Nusselt number in turbulent flow and the Nusselt number in smooth flow varies as a function of the Reynolds number, ot the intensity of turbulence and of the ratio between the scale of turbulence and cylinder diameter.
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