Physical effects, arising at the interaction of the acoustic additive to the temperature of the medium with a spherical cavity, weighted in the liquid
When a one-dimensional sound wave propagates in a free liquid medium, in addition to the sound pressure p ( x, t ) and the oscillatory velocity u 1 (x, t), an acoustic component to the medium temperature T<sup>/</sup> ( x, t ) arises in it. If there is a motionless spherical enclosure in the fluid, having small wave dimensions k<sub>1</sub> ∙R << 1, where k 1 is the wavenumber of the medium, R is the radius of the enclosure, then, due to the interaction of the main acoustic wave with the enclosure, a uniform temperature field with a variable amplitude, changing according to the harmonic law, appears on its surface T' <sub>m1</sub>∙e<sup>iωt</sup>. This occurs when a non-uniform heat wave arises inside the enclosure, which has a spherical shape of the front. The strong attenuation of this heat wave is accompanied by the dissipation of the energy of the main acoustic wave. In addition, during the propagation of a heat wave in the gas filling the enclosure, due to the release of thermo-acoustic energy, a secondary spherical acoustic wave is emitted, causing an oscillatory process to appear there.