Transport equations for the mean energy and temperature dissipation rates in grid turbulence

Simultaneous measurements of velocity and temperature fluctuations were mad e in the turbulent flow downstream of a grid-heated screen combination. The magnitudes of n and m, the power-law exponents for the decay of turbulent energy and temperature variances, are nearly equal. This approximate equali ty is in conformity with the locations of the peaks in the three-dimensiona l turbulent energy and temperature spectra. The values of n and m are consi stent with the isotropic forms of the transport equations for the mean turb ulent energy and temperature variance. They are also consistent, allowing f or the measurement accuracy, with the isotropic forms of the equations for the mean turbulent energy and temperature dissipation rates.