In the range of pressure from 3MPa to 18MPa, high pressure steam-water two-phase flow density wave instability in vertical upward parallel pipes with inner diameter of 12mm is studied experimentally. The oscillation curves of two-phase flow instability and the effects of several parameters on the oscillation threshold of the system are obtained. based on the small perturbation linearization method and the stability principles of automatic control system, a mathematical model is developed to predict the density wave instability threshold. The predictions of the model are in good agreement with the experimental results.
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