De-entrainment phenomena on vertical tubes in droplet cross flow
In this study flow conditions in the upper plenum of a PWR during the reflood stage of a loss-of-coolant accident (LOCA) are simulated using water sprays and a draft-induced wind tunnel. The de-entrainment efficiencies of isolated structures (25.4-, 63.5-, 101.6-mm-dia cylinders and a 76.2-mm square tube) are presented for a variety of air-water droplet cross flow conditions. Since droplet splashing and/or bouncing from the draining liquid film, which forms on the upstream 180/sup 0/ of the cylinder, is not accounted for in classical inertial impaction theory, there is substantial disagreement between measurement and the theory. The isolated tube de-entrainment efficiency is shown to be only weakly dependent on tube diameter, air velocity, droplet mean velocities, and total liquid flow rate for air velocities less than 14 m/s and droplet mass flux rates greater than 2 kg/m/sup 2/ s. The de-entrainment efficiencies of isolated tubes are extrapolated to those of tubes in a multiple tube array, and a predictive relation is presented for the overall de-entrainment efficiency of multiple tube arrays. 21 refs., 28 figs.
- Research Organization:
- Los Alamos Scientific Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5830338
- Report Number(s):
- NUREG/CR-1421; LA-8316-MS; ON: TI85015844
- Country of Publication:
- United States
- Language:
- English
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De-entrainment phenomena on vertical tubes in droplet cross flow. Informal report
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ACCIDENTS
AEROSOLS
AIR FLOW
COLLOIDS
COMPARATIVE EVALUATIONS
CROSSFLOW SYSTEMS
DISPERSIONS
DROPLETS
ENERGY TRANSFER
ENTRAINMENT
FILMS
FLUID FLOW
FLUID MECHANICS
FUNCTIONAL MODELS
GAS FLOW
HEAT TRANSFER
HYDRAULICS
HYDROGEN COMPOUNDS
LOSS OF COOLANT
MECHANICS
OXYGEN COMPOUNDS
PARTICLE SIZE
PARTICLES
PWR TYPE REACTORS
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTOR CORES
REACTORS
SIZE
SOLS
SPRAYS
TUNNELS
UNDERGROUND FACILITIES
WATER
WATER COOLED REACTORS
WATER MODERATED REACTORS
WIND TUNNELS