Strangely behaving fluidic oscillator
1 Institute of Thermomechanics v.v.i., Academy of Sciences of Czech Rep., 182 00 Prague, Dolejškova 5, Czech Republic
2 University of Technology and Life Sciences in Bydgoszcz, Poland
Fluidic oscillators became recently of increasing importance for a number of applications. Two alternative variants have been known so far: (a) feedback-loop configurations, with Strouhal number invariance and (b) configurations with a resonator and frequency not dependent on flow rate. Authors tested an oscillator of seemingly quite conventional two-loop design. Surprisingly, its properties fit to neither of the two established categories. Its Strouhal number is not constant and the frequency of oscillation is flow-rate dependent. There is, so far, no reasonable physical explanation for this strange behaviour.
© Owned by the authors, published by EDP Sciences, 2013
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