The results of an experimental study of a flow of a weakly conducting liquid in a thin coaxial channel with dielectric walls are presented. Using a probe, the degree of electrization of the flow is determined for various velocities. It is shown that in cavitational areas the liquid obtains a potential of up to hundred kilovolts. It is found that the liquid luminescence during the cavitation has a discrete character with the correlated radio noise. Formation of steady luminescent cavitational threads, moving in the flow, is revealed. Their role in the category of cavitational areas is determined.
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