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

• Main Authors: James Yang, Chang Lin, Ming-Jer Kao, Penghua Teng, Rajkumar V. Raikar
• Format: Article
• Language: English
• Published: MDPI AG 2018-11-01
• Series: Water
• Subjects: aerator; two-phase flow; air cavity; shadowgraphic image method (SIM); high-speed particle image velocimetry (HSPIV); bubble tracking method (BTM); bubble image velocimetry (BIV); flow impingement point; air bubbles
• Online Access: https://www.mdpi.com/2073-4441/10/11/1590

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.