TWO-PHASE PRESSURE LOSSES. Quarterly Progress Report No. 6, May 12, 1963- August 12, 1963

Technical Report · Sun Sep 01 04:00:00 EDT 1963

OSTI ID:4153450

Janssen, E; Kervinen, J A

The pressure drops along 0.75-, 1-, and 1.25-in. straight pipes and across three contraction-expansion inserts in a 1-in. pipe were measured under both singleand two-phase flow conditions. Pressure was varied from 600 to 1400 psia, flow from 0.25 x 10/sup 6/ to 1.66 x 10/sup 6/ lb/hr ft/sup 2/ and quality from zero to 90%. The single-phase pipe friction factor agrees with the Moody value for smooth pipe. The two-phase friction for horizontal flow shows no size effect in the range of pipe sizes from 0.75 to 1.25 in. The values lie below the Martinelli curve at the lower qualities (x < 0.6), but at high qualities tend to be above the Martinelli curve. The single-phase loss coefficient for the three contraction-expansion inserts show very little Reynolds number effect in the range of channel Reynolds numbers from 3 x 10/sup 4/ to 5 x 10/sup 5/. The two- phase data for insert number 1 were not reduced. The two-phase loss for insert numbers 2 and 3 lies generally below the loss prediction based on a homogeneous flow model. The two-phase loss for insert number 2 shows excellent agreement with the corresponding loss for the S-1 insert in the 0.50 by 1.75-in. rectangular chandnel (A/sub O//A/sub 1/ = 0.4, L/sub O/ = 0.1 in.). The two- phase loss for insert number 3 agrees fairly well with the loss for the S-5 insert (A/sub O//A/siu 1/ = 0.6, L/sub O/ = 0.1 in.). (auth)

• Research Organization: General Electric Co. Atomic Power Equipment Dept., San Jose, Calif.
• NSA Number: NSA-18-001864
• OSTI ID: 4153450
• Report Number(s): GEAP-4362
• Country of Publication: United States
• Language: English

Related Subjects

CONFIGURATION
DIAGRAMS
ENGINEERING
EXPANSION
FLUID FLOW
FRICTION
MEASURED VALUES
PIPES
PRESSURE
REYNOLDS NUMBER
TURBULENCE