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.
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