抄録
We analytically examined flow oscillation mode in parallel evaporating tubes of a natural circulation loop according the formerly reported nonlinear lumped-parameter homogeneous-flow model. We focused especially onto the phase relationship between the inlet flow rates of three parallel tubes, and showed that, within ten and several minutes, any types of oscillations with arbitrary phase difference are possible if their complex amplitudes cancel each other. We also showed that such a phase relation changes gradually during long time period and finally converges on two final oscillation mode with equal phase differences.
