Using a zeroth-order entropy production model, a relationship between the second viscosity, the relaxation time for a nonequilibrium process, and turbulence is determined from the macroscopic entropy rate equation. For turbulence generated reaction rate distortion, enhanced second viscosities can be predicted for turbulent fluid systems with long relaxation times and nonzero velocity divergence.
Using a Ludwieg tube wind tunnel, first evidence is obtained of a vanishing triple correlation in supersonic compressible turbulent flow. The results take advantage of a new technique for very high frequency direct estimation velocimetry from density measurements through laser induced fluorescence and seem to confirm early theoretical predictions of Tsugé and Sagara.
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