Abstract
A detailed hot-wire measurement has been made to establish universal knowledge for a turbulent natural convection boundary layer. The measurement of wall shear stress determined from mean velocity profiles on firm theoretical grounds yields an important result concerning the concept of the viscous sublayer for natural convection. The streamwise development of the turbulent boundary layer is systematically investigated for mean velocity, mean temperature, and both velocity and temperature fluctuations. The reliability of Reynolds stress and turbulent heat flux measurements is verified by the perfect agreement with the theoretical values calculated from mean momentum and thermal energy equations with measurements of mean velocity and temperature. Turbulent quantities obtained indicate quantitatively that the natural convection boundary layer has unique turbulent structures which are rarely seen in other turbulent boundary layers.
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