Simultaneous velocity measurements of both components of a two-phase flow using particle image velocimetry

Conference · Tue Jan 01 00:00:00 EST 1991 · Transactions of the American Nuclear Society; (United States)

OSTI ID:5707605

Canaan, R E; Hassan, Y A ^[1]

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1. Texas A and M Univ., College Station (United States)

The study described in this paper is an examination of two-phase dispersed air bubble mixing flow within a rectangular vessel. Particle image velocimetry is utilized to obtain noninvasive velocity measurements of the resulting bubbly flow field and its induced effects on a surrounding liquid medium. The method provides not only a visualization of the various patterns and structures of a given flow field but also yields quantitative full-field instantaneous velocity data from both phases of a two-phase system in a concurrent manner. Particle image velocimetry (PIV) is a rapidly advancing flow visualization technique in which the instantaneous velocity profile of a given flow field is determined by photographically recording tracer particle and/or bubble images within the flow at discrete instances in time and then conducting a completely computational analysis of the digitized data. The use of developed analysis algorithms, which perform a point-by-point matching of particle and bubble images from one digital image frame to the next, subsequently allows reconstruction of the respective instantaneous velocity profiles. The ability to simultaneously quantify both components of simple two-phase flows not only provides insight into the determination of the heat transfer and thermal-hydraulic stresses associated with multiphase systems but also contributes directly to a better understanding of the fundamentals of two-phase flows and the ability to quantify such two-phase flow characteristics as void fraction, relative component velocities, and interfacial drag.

• OSTI ID: 5707605
• Report Number(s): CONF-910603-; CODEN: TANSA
• Journal Information: Transactions of the American Nuclear Society; (United States), Vol. 63; Conference: Annual meeting of the American Nuclear Society (ANS), Orlando, FL (United States), 2-6 Jun 1991; ISSN 0003-018X
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
TWO-PHASE FLOW
FLOW VISUALIZATION
VELOCIMETERS
PERFORMANCE
AIR
ALGORITHMS
BUBBLES
DIGITAL SYSTEMS
DRAG
HEAT TRANSFER
HYDRAULICS
INTERFACES
MIXING
RESEARCH PROGRAMS
TIME DEPENDENCE
VOID FRACTION
ENERGY TRANSFER
FLUID FLOW
FLUID MECHANICS
FLUIDS
GASES
MATHEMATICAL LOGIC
MEASURING INSTRUMENTS
MECHANICS
420400* - Engineering- Heat Transfer & Fluid Flow