Deposition and entrainment of droplets in annular flow
Annular flow is encountered when gas and liquid phases flow in a tube and the flowrate of gas phase is high enough. In this flow pattern, liquid phase flows along the tube wall as a liquid film while gas phase flows in the core region within the tube cross-section; part of liquid phase flows in high velocity gas core flow as droplets. As a result of complex motion in highly turbulent flow, some droplets are deposited on the liquid film. Whereas, many droplets are generated at the surface of liquid film due to the interaction with gas core flow. Accurate prediction of the deposition rate and entrainment rate of droplets in annular flow is of importance from an engineering standpoint. We are doing the experiments to measure the deposition rate and entrainment rate of droplets in a small tube of 5 mm in inside diameter. New correlations have been developed from simple models and available experimental data. The influence of flow obstacle placed in a flow flow channel is also investigated.
Photograph of experimental facility
(Film removal and redeposition method)