Abstract
We measure experimentally the frequency of the large-scale instability developing on a liquid jet incompletely atomized by a parallel fast gas stream. We demonstrate that this “flapping instability” can be triggered by different mechanisms: in a first regime it is synchronized with the shear instability developing upstream, provided the wavelength of this shear instability is larger than the liquid jet diameter . When the shear instability exhibits wavelengths shorter than , a second regime is observed where the flapping instability becomes independent of the gas stream velocity. This second regime is characterized by a constant Strouhal number, provided the Froude number of the jet is correctly taken into account.
11 More- Received 28 November 2017
DOI:https://doi.org/10.1103/PhysRevFluids.3.043901
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