INVESTIGATION OF SOUND-WAVES PROPAGATION PECULIARITIES IN GAS-LIQUID FOAM

Both theoretical and experimental results of sound waves propagation peculiarities investigation in gas-liquid foams are presented in the paper. It is shown that the results of the experiments on studying weak shock waves in the gas-liquid foam can not be satisfactorily described by the standard model of sound propagation in two-phase media. To explain the obtained experimental data the authors suggest the model considering the peculiarities of the foam structure and the presence of additional hydrodynamic mechanism, influencing the signal evolution in foam - liquid motion along the system of the Plateau-Gibbs channels. The data of the experimental and calculated profiles analysis are evidence of the fact that the suggested model describes the real acoustical properties of gas-liquid foams more precisely than certain models for the two-phase mixtures with small gas content.