Velocity and phase distribution measurements in vertical air-water annular flows

Technical Report · Tue Jul 01 04:00:00 EDT 1997

DOI:https://doi.org/10.2172/350964· OSTI ID:350964

Vassallo, P

Annular flow topology for three air-water conditions in a vertical duct is investigated through the use of a traversing double-sensor hot-film anemometry probe and differential pressure measurements. Near wall measurements of mean and fluctuating velocities, as well as local void fraction, are taken in the liquid film, with the highest turbulent fluctuations occurring for the flow condition with the largest pressure drop. A modified law-of-the-wall formulation for wall shear is presented which, using near wall values of mean velocity and kinetic energy, agrees reasonably well with the average stress obtained from direct pressure drop measurements. The linear profile using wall coordinates in the logarithmic layer is preserved in annular flow; however, the slope and intercept of the profile differ from the single-phase values for the annular flow condition which has a thicker, more turbulent, liquid film.

• Research Organization: Knolls Atomic Power Lab., Schenectady, NY (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Nuclear Energy, Washington, DC (United States)
• DOE Contract Number: AC12-76SN00052
• OSTI ID: 350964
• Report Number(s): KAPL-P--000181; K--97073; ON: DE99001974
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
ANNULAR SPACE
DUCTS
EXPERIMENTAL DATA
PRESSURE DROP
SHEAR
TURBULENT FLOW
TWO-PHASE FLOW
VELOCITY
VOID FRACTION