Experimental Study of Hydro- and Sonoluminescence in Intense Hydrodynamic Flows and a Method for Recording Cavitation

The work is devoted to the experimental study of the phenomena of hydroluminescence during intense flows of liquids in a narrow channel and sonoluminescence that occurs during cavitation at the exit of liquid from a narrow channel. Understanding the nature of these phenomena can form the basis for methods of complex diagnostics of hydraulic system units and predicting their service life. In this work, the phenomena of hydro- and sonoluminescence have been recorded using the original installation. The proposed design of the measuring cell made it possible to separate the phenomenon of hydroluminescence in a narrow channel and the phenomenon of sonoluminescence at the outlet of the liquid into the diffuser. Universal threshold values for the deformation rate of hydroluminescence occurrence in the range of ~104–105 s−1 were obtained. Analysis of hydro- and sonoluminescence signals obtained using a photomultiplier tube showed qualitative differences between these phenomena. The phenomenon of sonoluminescence is directly related to cavitation. The phenomenon of hydroluminescence has a different origin, associated with the formation of collective modes of localized slips.