TWO-PHASE PRESSURE LOSSES. Fifth Quarterly Progress Report, February 12, 1963-May 12, 1963

Technical Report · Mon Jul 01 04:00:00 EDT 1963

OSTI ID:4703375

Janssen, E; Kervinen, J A

Void measurements were made in the 1/2-inch by 1 3/4inch rectangular channel, for both flow up and flow down, at pressures of 600, 1000, and 1400 psia and at various flows and qualities. Results at 1000 psia and 20 percent quality show that for the lowest flow (0.25 x 10/sup 6/ lb/hr-ft/sup 2/) the void fraction for flow down is much higher. However, when the flow is increased to 1.0 x 10/sup 6/ lb/hr-ft/sup 2/, both the void distribution and the average void for flow down tend to approach the corresponding values for flow up. At 1000 psia and 1.0 x 10/sup 6/ lb/hr-ft/sup 2/, both flow up and flow down, the void fraction for 5% quality increases gradually from the wall to the center of the channel, and peaks at the center. At 20% quality, the void fraction increases abruptly frona the wall and tends to be constant over the middle 65% of the channel. The void fraction for flow down is always greater than for flow up, other things being equal. Results at 1.0 x pressure is increased from 600 to 1400 psia, the void fraction decreases. A plot of average void versus quality at 1000 psia, various flows, shows that: the points at 1 x 10/sup 6/ and 2 x 10/sup 6/ lb/hr-ft/sup 2/ are in good agreement with Larson's results, and for flow up, flows less than 1 x 10/sup 6/ lb/ hr-ft/sup 2/, the points lie below Larson's curve, the lower points corresponding generally to the lower flkws. For flow down, the points generally lie above Larson's curve, the higher points corresponding to the lower flows. This is the flow effect noted earlier. (auth)

• Research Organization: General Electric Co. Atomic Power Equipment Dept., San Jose, Calif.
• NSA Number: NSA-17-030660
• OSTI ID: 4703375
• Report Number(s): GEAP-4275
• Country of Publication: United States
• Language: English

Related Subjects

DIAGRAMS
DISTRIBUTION
EFFICIENCY
ENGINEERING AND EQUIPMENT
EVAPORATION
FLUID FLOW
LOSSES
PIPES
PRESSURE
SURFACES
VAPOR QUALITY
VAPORS
VELOCITY