Liquid and gas velocity measurements using LDV in air-water duct flow

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:435797

Vassallo, P F; Kumar, R ^[1]

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1. Lockheed Martin Corp., Schenectady, NY (United States). Knolls Atomic Power Lab.

Simultaneous measurements of liquid and gas velocity have been made in air-water two-phase flow in a rectangular vertical duct. A forward/backward scattering Laser Doppler Velocimeter (LDV) with amplitude discrimination was used to measure each of the two phasic velocities. High speed photography and hot-film anemometry were used to confirm the gas and liquid velocities respectively. Transverse velocity profiles were acquired in both bubble and slug regimes to demonstrate the application of the LDV technique over a range of flow conditions and void fractions. Experiments were performed with two bubble sizes and with slugs. With the injection of bubbles, a flattened two-phase flow mean velocity profile was observed. Results indicate that for a given gas flow, the relative velocity of the bubbles increases with increasing flowing void fraction for large bubbles and the opposite trend is observed for smaller bubbles. These results are consistent with the Zuber-Findlay equation. Two-phase bubbly flows are often encountered in boiling water reactors, oil reprocessing, and high performance heat exchangers.

• DOE Contract Number: AC12-76SN00052
• OSTI ID: 435797
• Report Number(s): CONF-951135--; ISBN 0-7918-1755-5
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
BWR TYPE REACTORS
EXPERIMENTAL DATA
FLOW RATE
HEAT EXCHANGERS
PETROLEUM REFINERIES
TWO-PHASE FLOW
VELOCIMETERS