加速のない垂直気液二相流の摩擦エネルギー消散

抄録

In non-accelerated upward two phase flow, irreversible energy dissipation is caused by wall friction and interphase friction between gas and liquid due to slip. These two components of energy dissipation are deduced from two different methods; one is from equations of force and energy balance and the other from analysis of gedanken-experiment on the gravitational head of two phase flow.
Frictional force due to wall must have same magnitude per unit volume in both liquid and gas. Moreover, the characteristics of energy dissipation were investigated in a circular pipe and in nuclear fuel assemblies using the data of pressure loss. It is found that these characteristics show strong dependence on flow pattern and rod bundle arrangement.