Abstract
This paper describes measurements in a grid-generated turbulent flow heated to a uniform temperature gradient which is self-maintained. The heating was kept small so that the experiment approximates the model of an incompressible fluid transporting a passive attribute. This model has been the subject of previous theoretical studies, which are briefly described. The measurements showed qualitative agreement with some of the hypotheses and results of the analysis given by Corrsin. Predictions of the double temperature and velocity temperature correlations in the final period of decay have been made in the analytical work of Dunn and Reid, but measurements made in the initial period of decay are significantly different. Deductions of the Lagrangian velocity integral scale and the ratio of ‘eddy’ to molecular thermal conductivity are made from measurements of the temperature fluctuation and the heat-transfer correlation coefficient. They are compared with the results of the diffusion behind a line source experiment reported by Uberoi and Corrsin and also by Townsend. The development of temperature fluctuation is controlled solely by the relative magnitudes of production and decay in this experimental flow. The temperature fluctuation appears to persist in growth in all the measurements, and the cause seems to be the growth of the scale of the decaying turbulence.
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