Application of SIM, HSPIV, BTM, and BIV Techniques for Evaluations of a Two-Phase Air–Water Chute Aerator Flow

• Published in: Water (Basel) Vol. 10; no. 11; p. 1590
• Main Authors: Yang, James, Lin, Chang, Kao, Ming-Jer, Teng, Penghua, Raikar, Rajkumar V.
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 06.11.2018
• Subjects: Aerator; Aerators; Air; air bubble; Air bubbles; Air cavity; Bubble image velocimetry (BIV); Bubble tracking method; Bubble tracking method (BTM); Bubbles; Cavitation; cavity; detection method; Flow characteristics; Flow impingement point; Flow of water; Flow velocity; Flow visualization; free surface flow; Free surfaces; groundwater flow; High-speed particle image velocimetry (HSPIV); High-speed particles; Hydraulics; Image method; Image velocimetry; Inclination angle; instrumentation; Interfaces; Measurement techniques; Multiphase flow; numerical method; Particle image velocimetry; Phase interfaces; Probability distribution; Reynolds number; Shadowgraphic image method (SIM); Statistical analysis; Transpiration; Two phase flow; two-dimensional flow; Velocimeters; Velocity; Velocity distribution; Velocity measurement; Water aeration; Water flow
• ISSN: 2073-4441; 2073-4441
• DOI: 10.3390/w10111590

Four image-based techniques—i.e., shadowgraphic image method (SIM), high-speed particle image velocimetry (HSPIV), bubble tracking method (BTM), and bubble image velocimetry (BIV)—are employed to investigate an aerator flow on a chute with a 17° inclination angle. The study focuses on their applications to the following issues: (1) to explore the characteristic positions of three water–air interfaces; (2) to interpret the evolution process of air bubbles shed from the wedged tip of the air cavity; (3) to identify the probabilistic means for characteristic positions near the fluctuating free surface; (4) to explore the probability distribution of intermittent appearance of air bubbles in the flow; (5) to obtain the mean streamwise and transverse velocity distributions of the water stream; (6) to acquire velocity fields, both instantaneous and mean, of air bubbles; (7) to construct a two-phase mean velocity field of both water flow and air-bubbles; and (8) to correlate the relationship among the probability distribution of air bubbles, the mean streamwise and transverse velocity profiles of air bubbles, and water stream. The combination of these techniques contributes to a better understanding of two-phase flow characteristics of the chute aerator.