Effect of inlet and riser sections on two-phase flow instability under rolling

In this paper the two-phase flow instability of parallel channels system is studied under ocean conditions. The effect of inlet and riser sections under rolling motion is analyzed detailed. The parallel channel model based on the homogeneous flow model and the system equations are built by using control volume integrating method. The rolling motion model is also included. Gear method is used to solve the equations. The instability boundary under ocean condition is obtained. It is found that the instable regions occur both in low and high equilibrium quality regions. In high equilibrium quality the period-doubling phenomena are found. (authors)