TWO-PHASE PRESSURE LOSSES. Quarterly Progress Report No. 4, November 12, 1962-February 12, 1963

Technical Report · Fri Mar 01 04:00:00 EST 1963

OSTI ID:4694351

Janssen, E; Kervinen, J A

Pressure drop was measured along a 1/4" x 1 3/4" rectangular channel and across two contraction-expansion inserts in a 1/2" x 1 3/4" channel, under both single and two-phase flow conditions. The ratio of two-phase to single-phase loss across the S-1 insert (B/sub 0//B/sub 1/ = 0.4) appears to be independent of both flow and orientation. It is about 20% below the ratio based on the homogeneous model for the steam and water. The ratio for the S-5 insert (B/sub 0/ /B/sub 1/ = 0.6) is in good agreement with the S-l insert at qualities below 50%. The single-phase friction factor points for the 1/4" x 1 3/4" channel lie about 20% below the Moody smooth pipe curve. The ratio of two-phase to single-phase loss for the 1/4" x 1 3/4" channel shows a flow effect at qualities above 40%, the ratio being higher for lower flows. The points lie everywhere below the Martinelli curve. This is in contrast to the results for the 1/2" x 1 3/4" channel. In the range of channel sizes being considered here, the smaller the hydraulic diameter, the lower the ratio of two-phase to single-phase loss. (auth)

• Research Organization: General Electric Co. Atomci Power Equipment Dept., San Jose, Calif.
• NSA Number: NSA-17-029069
• OSTI ID: 4694351
• Report Number(s): GEAP-4202
• Country of Publication: United States
• Language: English

Related Subjects

CONFIGURATION
DIAGRAMS
EFFICIENCY
ENGINEERING AND EQUIPMENT
EVAPORATION
EXPANSION
FLOW MODELS
FLUID FLOW
HYDRAULICS
LABORATORY EQUIPMENT
LIQUIDS
LOSSES
MATHEMATICS
MEASURED VALUES
PERFORMANCE
PIPES
PRESSURE
STANDARDS
STEAM
SURFACES
VAPORS
VOID FRACTION
WATER