Measurement of velocities in gas-liquid two-phase flow using Laser Doppler Velocimetry

Technical Report · Tue Sep 01 04:00:00 EDT 1992

OSTI ID:10129997

Vassallo, P F; Trabold, T A; Moore, W E; Kirouac, G J

Measurements of bubble and liquid velocities in two-phase flow have been made using a new forward/backward scattering Laser Doppler Velocimetry (LDV) technique. This work was performed in a 6.4 by 11.1 mm vertical duct using known air/water mixtures. A standard LDV fiber optic probe was used to measure the bubble velocity, using direct backscattered light. A novel retro-reflector and lens assembly permitted the same probe to measure the liquid velocity with direct forward-scattered light. The bubble velocity was confirmed by independent measurements with a high-speed video system. The liquid velocity was confirmed by demonstrating the dominance of the liquid seed data rate in the forward-scatter measurement. Experimental data are presented to demonstrate the accuracy of the technique for a wide range of flow conditions, from bubbles as small as 0.75-mm-diam to slugs as large as 10-mm wide by 30-mm long. In the slug regime, the LDV technique performed velocity measurements for both phases, for void fractions up to 50%, which was the upper limit of our experimental investigation.

• Research Organization: Knolls Atomic Power Lab., Schenectady, NY (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC12-76SN00052
• OSTI ID: 10129997
• Report Number(s): KAPL--4738; ON: DE93008083
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102
42 ENGINEERING
420400
AIR
BUBBLES
CHEMICAL AND SPECTRAL PROCEDURES
DOPPLER EFFECT
FIBER OPTICS
GASES
HEAT TRANSFER AND FLUID FLOW
LIQUIDS
PHASE STUDIES
TWO-PHASE FLOW
ULTRAHIGH-SPEED PHOTOGRAPHY
VELOCITY
VOID FRACTION
WATER