INVESTIGATION OF WET STEAM AS A REACTOR COOLANT (CAN-2). VOLUME I. BEHAVIOR OF A FOG FLOW AS A COOLANT. Final Report

Technical Report · Fri Aug 10 04:00:00 EDT 1962

OSTI ID:4705180

Stein, R P; Firstenberg, H; Israel, S; Crane, M; Hankel, R

Theoretical and experimental studies were performed to enhance the understanding of the mechanism of heat trans fer in vapor-liquid mixtures under fog flow conditions. Mass conservation was applied to an idealization of fog flow, involving simple representation of turbulent diffusion of droplets, and allowing for droplet coalescence and breakup. This application resulted in a general theory describing the behavior of a fog flow as a coolant. Use of the theory was illustrated by application to special simplified cases, in which liquid mass flow in a possible film at the wall is considered negligible. When application is made to cases with evaporation at the wall, the theory accounts for liquid transport to the wall by droplet diffusion and liquid carryover with the vapor away from the wall. The critical heat transfer condition occurs when the net flow of liquid toward the wall is insufficient to keep the wall wct. Comparison of theory with CISE burnout data and Ansaldo high pressure phase distribution data appears encouraging. A prediction that no critical heat transfer condition will be Obtained when a characteristic dimensionless group is less than a certain value was in agreement with the CISE data. Interaction of a stream of 200-250 mu droplets with saturated steam under atmospheric pressure was studied using high speed still photography to test whether the distributioh of droplets in a turbulent vapor stream can be described on the basis of a droplet diffusion model. The results of this study give evidence that droplets of this size are capable of rapidly assuming the velocity of the flowing stream, providing general confirmation to the hypothesis that the transpont of droplets in a turbulent stream below a certain size may be described by a diffusion law. (auth)

• Research Organization: United Nuclear Corp. Development Div., White Plains, N.Y.
• NSA Number: NSA-17-011965
• OSTI ID: 4705180
• Report Number(s): UNC-5008-I; NYO-9844-I
• Country of Publication: United States
• Language: English

Related Subjects

BURNOUT
COOLANT LOOPS
COOLANTS
DIFFUSION
DISTRIBUTION
DROPLETS
EQUATIONS
EVAPORATION
FILMS
FLUID FLOW
GAS COOLANT
GAS FLOW
HEAT TRANSFER
HIGH TEMPERATURE
HUMIDITY
LIQUIDS
MASS
MATERIALS TESTING
MATHEMATICS
MEASURED VALUES
MIXING
PERFORMANCE
PHOTOGRAPHY
POWER PLANTS
PRESSURE
REACTOR TECHNOLOGY
REACTORS
RECORDING SYSTEMS
SPHERES
STEAM
SURFACES
TEMPERATURE
THERMAL CONDUCTIVITY
THERMAL DIFFUSION
THERMODYNAMICS
TRANSPORT
TUBES
TURBULENCE
VAPORS
VELOCITY
VOLUME
WATER COOLANT