Numerical Simulation of Liquid Film Spreading Performance with Different Wall Features

The spreading performance of liquid film had crucial effects on the safety of passive containment cooling system. A three-dimensional model was developed to simulate the influences of falling film plate structures, contact angles and Reyonlds numbers on the liquid film spreading performance. The simulation results agree well with the experimental and theoretical results. It is shown that the liquid film spreading time, liquid film thickness and interfacial turbulence on transverse corrugated plate are bigger than those on flat plate and vertical corrugated plate, and the circulation flow is observed at the wave trough of transverse corrugated plate. With the increase of the contact angle or the decrease of Reynolds number, the flow pattern gradually transforms from complete flow to flow with dry patches, rivulet flow and droplet flow. Compared with flat plate, the spreading performance exhibites very different characters on vertical corrugated plate with the changing of contact angle due to its effects of flow diversion and liquid film breaking.