Abstract
The semi-empirical solution of the turbulent thermal boundary layer, obtained by the Reynolds analogy, is not completely satisfactory. In realization of the experiments, especially at high Re and Pr numbers, enormous technical difficulties were overcome to allow conclusive experimental results without neglecting the initial assumptions (constant fluid properties). By means of a new conception, some tests could be achieved in the case of forced convection in established turbulent flow region with quasiconstant physical fluid properties. The precise measures of the temperature distribution close to the heated wall, prove that the coeffcient B of the semi-logarithmical law \\ ̄ gq + = B log y + + C is of the order of 4·85 (instead of 5·65 for the velocity distribution) at Pr # 7·5 and Re # 250000, while the constant C, depending on the number of Pr, is about 47.
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