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Experimental Study of Particle Size, Sound Velocity, and Resonance Phenomena in a Two-Phase Foam Flow

A. P. Sevast'yanov
Moscow Power Institute (Technical University), Russia

I. V. An
Moscow Power Institute (Technical University), Russia

S. I. Vainshtein
Institute for High Temperatures of the Russian Academy of Sciences, Moscow, Russia

Yu. A. Sevast'yanov
Moscow Power Institute (Technical University), Russia

A. V. Sidnev
Moscow Power Institute (Technical University), Russia

M. M. Grishutin
A. F. Mozhaiskii Military Engineering Red-Banner Institute, St. Petersburg, Russia

ABSTRACT

In a number of cases a two-phase foam mixture flow in a rectangular channel is accompanied by appearance of geometric resonances. Measurement of resonance frequency at the known parameters of the channel allows one to determine a velocity of sound in a two-phase flow and a characteristic size of "bubbles". Measurements of eigennoises of a vapor-water flow at a mixture temperature of 50°C, a velocity of 50 m/sec, and a volumetric vapor content of 0.727 revealed the range of bubble sizes by a continuous portion of the spectrum and frequencies of resonances (transverse and longitudinal) in the diffuser throat with a cross-section of 6×40 mm and a length of 18 mm.
The results of measurements were compared to the values of a sound velocity calculated by theoretical relations derived by I. S. Radovskii (Moscow Institute of Engineering Physics). Resonances on eight frequencies (transverse and two longitudinal) found in the experiments arise at a sound velocity of 90−400 m/sec and coincide with the calculated values within the error of the experiment (deviation not higher than 4%). The scheme of measurements may be used to diagnose a structure of a two-phase flow at mean values of volumetric vapor content.