The Westinghouse Advanced Passive PWR AP-600 and AP-
1000 are pressurized water reactors (PWR) with advanced
passive safety systems. Most recognize the passive containment
cooling system (PCCS) as being one of the most important
concepts for advanced passive safety systems. The steel
containment structure consists of a vertical right-circular
cylinder capped with oblate spheroids at both ends. Following
a postulated design-base-accident (DBA), an outside cold
liquid-water spray is injected on the apex of the spheroidal
dome. The resulting liquid-film drains under gravitational body
forces over the outside dome surface and down the cylinder
surface. This PCCS removes heat from the containment interior
to reduce potentially damaging pressure and temperature loads.
To facilitate model validation we have developed an exact
numerical solution (ENS) for the one-dimensional steady-state
liquid film flow over an ellipsoidal-domed cylinder. Although
the ENS assumes constant containment wall temperature and
outside ambient air temperature, it can incorporates any
generalized heat transfer correlation between the containment
surface and liquid film as well as any generalized heat and mass
(evaporation) transfer correlations between the film and outside
ambient air. ENS results for draining liquid water films clearly
present the coupling effects of heat and mass transfer.
Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.