INFLUENCE OF PERMANENT TURBULENT AIR FLOW ON ACOUSTIC STREAMING

Permanent turbulent air flow at low Mach number does not disturb the longitudinal gradient of mean pressure associated with acoustic streaming, while the profile of mean axial velocities of the air flow is not appreciably modified when it is subjected to the wave generating the acoustic streaming. This is highlighted by the present experiments and discussed in the theoretical framework initially proposed by Rayleigh, then generalized by Nyborg and Westervelt. The result is, on the one hand, the possibility of predicting simply the Reynolds stress exerted on a permanent turbulent air flow subjected to a wave generating acoustic streaming, and on the other hand, the very likely absence of any influence of permanent turbulent air flow on acoustic streaming.