Before the bubbly flow transits to cap-bubbly flow, the growth rate of void fraction wave becomes the maximum value when the disturbance frequency is close to the main frequency of void fraction wave.

• 空隙率波的增长系数求解结果表明，泡状流向弹帽泡状流转化时，空隙率波对有限扰动是不稳定的，并对扰动的频率有所选择。当扰动频率与空隙率波的主控频率相近时，空隙率波呈最大增长状态。