Hydrodynamic characteristics of the microbubble dissolution in liquid using orifice type microbubble generator

Juwana, Wibawa Endra; Widyatama, Arif; Dinaryanto, Okto; Budhijanto, Wiratni; Indarto, Indarto; Deendarlianto,

doi:10.1016/j.cherd.2018.11.017

Cited by 50 publications

(46 citation statements)

References 20 publications

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“…The large size of the bubble is expected since the bubbles were depressurized as they rose to the top of the liquid. Analysis of similar type of MBG has been reported earlier but with much lower aeration rates whereby the bubble sizes near the discharge point were around 100-300 µm [24]. The MBG works based on the Bernoulli Principle, which epitomizes the energy balance principles in which the increase in liquid velocity through the throat leads to lower pressure reaching a vacuum condition.…”

Section: Effect Of Liquid Velocity On the Vacuum Pressure And Gas Velmentioning

confidence: 79%

“…The experiments were conducted at room temperature of 20 • C, using tap water as medium for oxygen dissolution. Before each experiment, the initial dissolved oxygen (DO) of the water was measured and 7.9 ppm of sodium sulfite (Na 2 SO 3 , R&M Chemicals, London, UK) per ppm of oxygen was added into the water to for deoxygenation [21,24]. A total of 1.5 ppm of cobalt chloride (Sigma-Aldrich, St. Louis, MO, USA) was added too, as the catalyst for the oxygenation reaction.…”

Section: Methodsmentioning

confidence: 99%

“…The ejector forms microbubbles with the diameters of about 40 to 50 µm. On the other hand, a recent study reported that the diameters of microbubbles formed by the venturi type of MBG are in a range of 100-300 µm [24].…”

Section: Introductionmentioning

confidence: 95%

“…The aim is to understand the behavior of oxygen transport from gas to liquid phase before conducting further operational optimization, or even optimizing the MBG design. The liquid velocity range was set from 2.36 to 2.60 m/s (35-40 L/min), which corresponds to the range which is sensitive to the bubble size (please see reference [24]). It also includes the assessment of the aeration efficiency (kgO 2 /kWh), which allows us for a better comparison with other MBGs and other established aeration systems.…”

Section: Introductionmentioning

confidence: 99%

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Porous Venturi-Orifice Microbubble Generator for Oxygen Dissolution in Water

et al. 2020

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Microbubbles with slow rising speed, higher specific area and greater oxygen dissolution are desired to enhance gas/liquid mass transfer rate. Such attributes are very important to tackle challenges on the low efficiency of gas/liquid mass transfer that occurs in aerobic wastewater treatment systems or in the aquaculture industries. Many reports focus on the formation mechanisms of the microbubbles, but with less emphasis on the system optimization and assessment of the aeration efficiency. This work assesses the performance and evaluates the aeration efficiency of a porous venturi-orifice microbubble generator (MBG). The increment of stream velocity along the venturi pathway and orifice ring leads to a pressure drop (Patm > Pabs) and subsequently to increased cavitation. The experiments were run under three conditions: various liquid velocity (QL) of 2.35–2.60 m/s at fixed gas velocity (Qg) of 3 L/min; various Qg of 1–5 L/min at fixed QL of 2.46 m/s; and free flowing air at variable QLs. Results show that increasing liquid velocities from 2.35 to 2.60 m/s imposes higher vacuum pressure of 0.84 to 2.27 kPa. They correspond to free-flowing air at rates of 3.2–5.6 L/min. When the system was tested at constant air velocity of 3 L/min and under variable liquid velocities, the oxygen dissolution rate peaks at liquid velocity of 2.46 m/s, which also provides the highest volumetric mass transfer coefficient (KLa) of 0.041 min−1 and the highest aeration efficiency of 0.287 kgO2/kWh. Under free-flowing air, the impact of QL is significant at a range of 2.35 to 2.46 m/s until reaching a plateau KLa value of 0.0416 min−1. The pattern of the KLa trend is mirrored by the aeration efficiency that reached the maximum value of 0.424 kgO2/kWh. The findings on the aeration efficiency reveals that the venturi-orifice MBG can be further optimized by focusing on the trade-off between air bubble size and the air volumetric velocity to balance between the amount of available oxygen to be transferred and the rate of the oxygen transfer.

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Section: Effect Of Liquid Velocity On the Vacuum Pressure And Gas Velmentioning

confidence: 79%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Porous Venturi-Orifice Microbubble Generator for Oxygen Dissolution in Water

et al. 2020

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“…A microbubble isdefined as a bubble with a diameter ofless than one millimeter (50-200 µm) (Juwana et al, 2019;Deendarlianto et al, 2015). Microbubbles have advantages across many applications due to their bubble size.…”

Section: Introductionmentioning

confidence: 99%

Generation of Microbubbles through Single Loop and Double Loop Fluid Oscillator for Photobioreactor Aeration

Rizaldi

Rahman

Deendarlianto

et al. 2019

IJTech

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Microbubbles are known for their many applications. Recently there has been new findings regarding the growth of susceptible microalgae through microbubble aeration. There are three methods used to generate microbubbles for this microalgae strain. Unfortunately, for some methods, the cost of generating microbubbles is still high. However, fluidic oscillators can be used to produce microbubbles at a reasonable cost. There are two types of fluid oscillators: single loop and double loop. This study determined the bubble size produced with these oscillators. Bubble size data was recorded using a high-speed camera at air flow rates of 6 LPM, 9 LPM, 12 LPM, and 15 LPM, and utilized 10 µm microporous shafts as the diffuser. The data were processed using ImageJ software. The results showed that the size of the bubble using a single loop fluid oscillator was smaller than that of the double loop fluid oscillator. The smallest bubble size was obtained in a single loop fluid oscillator with an airflow of 6 LPM.

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A study of bubble size/shape evolution in microbubble countercurrent contacting flotation column

Han

Chen

2022

Asia-Pacific J Chem Eng

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Cationic collectors are widely used in the flotation of iron ore, silicate, oxides, and so forth. At this stage, so much research has been carried out on flotation column cells, but more attention needs to be paid to the hydrodynamic properties in the presence of cationic collectors in cells. In order to study foaming performance and hydrodynamic characteristics in the presence of GE609, the bubble characteristics are studied in an experimental scale flotation column. A high-speed camera recorder is used to take bubbles' images, and the bubble size and shape under different conditions is measured by image analysis. This paper aims to explore the effect of dispersed gas and continuous liquid velocities on the bubble size and aspect ratio at different axial heights in a countercurrent flotation column in the presence and absence of GE609. In the

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Hydrodynamic characteristics of the microbubble dissolution in liquid using orifice type microbubble generator

Cited by 50 publications

References 20 publications

Porous Venturi-Orifice Microbubble Generator for Oxygen Dissolution in Water

Porous Venturi-Orifice Microbubble Generator for Oxygen Dissolution in Water

Generation of Microbubbles through Single Loop and Double Loop Fluid Oscillator for Photobioreactor Aeration

A study of bubble size/shape evolution in microbubble countercurrent contacting flotation column

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