2122 差圧振動による気液二相流動の推定  [in Japanese] Estimation of two-phase flow behavior with pressure difference oscillation  [in Japanese]

The oscillation of differential pressure (DP) in two-phase flow is very important not only for the design of heat exchangers but also for the estimation of flow behavior by detecting the vibration or noise from components. The two-phase flow experiments were conducted with small vertical tubes of 1 to 10mm in diameter. This time-averaged value of DP was well predicted with the conventional correlations for pressure loss and void fraction. The root mean square (RMS) value of DP was well correlated with Lockhart-Martinelli parameter. It was also demonstrated that the two-phase quality could be estimated with the proposed correlation for RMS values when the liquid flow rate and RMS value were measured.