Propagation Characteristics of Pressure Wave through Gas-Liquid Plug-Train System : 1st Report, Step Response

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This paper studies the propagation characteristics of pressure wave through a gas-liquid plug-train system which is one of the simplest flow regimes for two-phase flow. A relaxed pressure wave occurs owing to both liquid inertia and gaseous compressibility and propagates at a slower speed in this system than in a gas. The experimental results for an air-water plug-train system at rest in a pipe agree qualitatively with the analytical results for a coupled mass-spring model. The system shows a peculiar dispersion property and behaves symmetrically and concavely with respect to 0.5 in void fraction. The propagation velocity of pressure wave approaches the maximum, which is equivalent to that of pressure wave in a homogeneous two-phase mixture, as the plug length decreases.
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