| Abstract: | The propagation of low-frequency periodic pressure pulses along an isothermal stationary flow of various polymer melts in a flat channel of finite length has been experimentally and theoretically investigated. It is shown that as a result of the wave character of the process there is a phase shift between the pressure vibrations at various points along the length of the channel, while the amplitudes of the pressure vibrations decrease along the flow in accordance with a nonlinear law. Analysis of the problem leads to the establishment of a relation between the characteristics of the wave process, the properties of the medium, and the channel geometry.Moscow Institute of Chemical Machine Building. Institute of Problems of Mechanics, Academy of Sciences of the USSR, Moscow. Translated from Mekhanika Polimerov, No. 3, pp. 493–500, May–June, 1976. |
