For upward churn flow, it is found that the relationship between frictional pressure drop and venturi pressure drop can be calculated by Martinelli parameter X.

• 在块状流条件下，推导了利用马丁内里参数计算垂直上升管摩擦压降与文丘利管节流压降间关系的公式，进而实现了截面含气率的测量。