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Article

Effect of Primary Variables on A Confined Plunging Liquid Jet Reactor

1
Department of Environment Technologies and Management, Kuwait University, P.O. Box 5969, Safat 13060, Kuwait
2
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Water 2020, 12(3), 764; https://doi.org/10.3390/w12030764
Received: 3 February 2020 / Revised: 2 March 2020 / Accepted: 8 March 2020 / Published: 10 March 2020
The effects of operating conditions including a novel downcomer geometry on the gas/air entrainment rate, Qa, were investigated for a local vertical confined plunging liquid jet reactor (CPLJR) as an alternative aeration process that is of interest to Kuwait and can be used in various applications, such as in wastewater treatment as an aerobic activated sludge process, fermentation, brine dispenser, and gas–liquid reactions. Operating conditions, such as various downcomer diameters (Dc = 45−145 mm), jet lengths (Lj = 200–500 mm), nozzle diameters (dn = 3.5–15 mm), and contraction angles (Ɵ =20–80°), were investigated. A newly designed downcomer with various mesh openings/pores (Dm = 0.25ʺ (6.35 mm)–1ʺ (25.4 mm)) was also investigated in the current study. The air entrainment results showed that these were the primary parameters for the measured air entrainment rate in confined systems. The highest gas entrainment rates were achieved when the ratio of the downcomer diameter (Dc) to the nozzle diameter (dn) was greater than approximately 5, as long as the liquid superficial velocity was sufficient to carry bubbles downward. Furthermore, a downcomer with mesh openings (Dm) less or equal to 0.5ʺ (12.7 mm) provided a higher entrainment rate than that of conventional downcomer (without a mesh). View Full-Text
Keywords: contraction angle; gas/air entrainment rate; confined plunging jet; primary parameters; two-phase; mesh contraction angle; gas/air entrainment rate; confined plunging jet; primary parameters; two-phase; mesh
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MDPI and ACS Style

S. Al-Anzi, B. Effect of Primary Variables on A Confined Plunging Liquid Jet Reactor. Water 2020, 12, 764. https://doi.org/10.3390/w12030764

AMA Style

S. Al-Anzi B. Effect of Primary Variables on A Confined Plunging Liquid Jet Reactor. Water. 2020; 12(3):764. https://doi.org/10.3390/w12030764

Chicago/Turabian Style

S. Al-Anzi, Bader. 2020. "Effect of Primary Variables on A Confined Plunging Liquid Jet Reactor" Water 12, no. 3: 764. https://doi.org/10.3390/w12030764

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