Abstract
Unsteady behavior of two phase mixture is very complex phenomena which depending on the characteristic of the system and range of the working parameters, will appear in the form of the deformed or selfsustanable flow rate oscillations, pressure, temperature and other parameters. In this paper results of the experimental and analytical study devoted to the investigation of unsteady regimes in air-water adiabatic two phase flow in the system three parallel hydrodinamicaly not identical vertical channels are presented. The onset of oscillatory instability parallel channel two phase flow in time and complex domain is analysed. Using experimentally determined transfer function of the system the criterion’s for the determination of the linearity or nonlinearity was defined. Obtained results show that dynamic equilibrium of conservative forces in two phase system do not ensure stable flow in all its parts. For the regimes when friction forces in two phase part of the channel are dominant over the dissipation and inertial forces, appearance of the unstable pulsation of pressure drop in one, two or all three parallel channels under stable system characteristics is possible.
