Determination of level swell flow regime

The different flow regimes during level swell (churn-turbulent, bubbly and droplet) were described in 4.3.1. In order to perform a level swell calculation, it is necessary to decide the flow regime. 

Moderate viscosity ( 100 cP) will tend to keep the flow regime bubbly at higher superficial velocities. Bubbly flow at high superficial velocity approximates to homogeneous flow. At very high viscosity, completely different flow regimes may occur (see 10.2.3). 

The same small-scale test which, distinguishes whether the mixture is inherently foamy (see A2.3.2) may also give some indication of the flow regime. However, 

---