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Analysis of regular and irregular acoustic streaming patterns in a rectangular enclosure. (English) Zbl 1231.76002
Summary: This study reports an experimental investigation of the non-linear phenomena of regular (classical) and irregular streaming patterns generated in an air-filled rigid-walled square channel subjected to the acoustic standing waves of different frequencies and intensities. The interaction of acoustic waves and thermoviscous fluids is responsible for these phenomena. The resonator’s walls are maintained at isothermal condition. Synchronized particle image velocimetry (PIV) technique has been used to measure the streaming velocity fields. The experimental results show that at a given excitation frequency, regular streaming flow patterns are observed up to a certain value of the excitation amplitude. As the amplitude increases beyond this limit, the regular streaming is distorted to an irregular flow structure. The regular and irregular streaming are classified in terms of streaming Reynolds number. It is found that for $$Re_{s2}<50$$, classical streaming flow patterns are established and then deform to irregular and complex shapes as $$Re_{s2}$$ exceeds $$50$$.

##### MSC:
 76-05 Experimental work for problems pertaining to fluid mechanics 76Q05 Hydro- and aero-acoustics
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