ENTROPY OF TURBULENT GAS: MACROSCOPIC AND TURBULENT PARTS. BOUNDARY-LAYER: EXPRESSIONS FOR CELERITIES OF FILTERED FLUCTUATIONS; FIRST MEASUREMENTS FOR TEMPERATURE FLUCTUATIONS.
Final scientific rept. no. 4,
AIX-MARSEILLE UNIV (FRANCE) INSTITUT DE MECANIQUE STATISTIQUE DE LA TURBULENCE
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1 A discussion is given of separation of entropy for turbulent gas into macroscopic and fluctuating parts. When the macroscopic part has by definition the evolution property it has not exactly the GIBBs form, and recriprocally. The defect terms are expressed in both cases, for evaluation in each field of applications. 2 The equations for filtered space-time velocity correlations in turbulent flow are given in terms of celerities. The case of a narrow band-pass filter is discussed. Measurements of the celerities for velocity and temperature space-time correlation are made, in a boundary layer of a heated plate. They are both larger than the mean velocity of fluid in the inner part of the boundary layer. Author
- Fluid Mechanics