Experimental investigation of microbubble generation in the venturi nozzle

Lee, Chang Hun; Choi, H. K.; Jerng, Dong-Wook; Kim, Dong Eok; Ahn, Ho Seon

doi:10.1016/j.ijheatmasstransfer.2019.03.040

Cited by 50 publications

(42 citation statements)

References 14 publications

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“…Their results showed that increasing the throat length and divergent angle or decreasing the throat diameter and outlet diameter resulted in the reduction of the produced bubble sizes. However, they were barely influenced by the convergent angle and the diameter and number of the gas feeding holes (Li et al, 2017;Lee et al, 2019). The throat diameter and divergent angle play key roles in determination of the performance of a Venturi-type bubble generator.…”

Section: Effects Of Geometric Parametersmentioning

confidence: 99%

A review on bubble generation and transportation in Venturi-type bubble generators

Huang

Sun

Liu

et al. 2019

Exp. Comput. Multiph. Flow

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Venturi-type bubble generators own advantages of simplicity in structure, high efficiency, low power consumption, and high reliability, exhibiting a broad application potential in various fields. This work presents a literature review of recent progress in the research concerning Venturi-type bubble generators, with a focus on the performance evaluation, bubble transportation, and breakup mechanisms. Experimental studies employing flow visualization techniques have played an important role in exploring the bubble transportation and breakup phenomena, which is vitally necessary for clarifying the bubble breakup mechanisms and understanding the working principle and performance of a Venturi channel as a bubble generator. A summarization was carried out on both experimental and theoretical work concerning parameters influencing the bubble breakup and the performance of Venturi-type bubble generators. Based on the geometric parameter optimization combined with appropriate flow conditions, it is expected that Venturi-type bubble generators can produce bubbles with controllable size and concentration to satisfy the application requirements, while a further work is required to illustrate the interaction between the liquid and gas bubbles.

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Section: Effects Of Geometric Parametersmentioning

confidence: 99%

A review on bubble generation and transportation in Venturi-type bubble generators

Huang

Sun

Liu

et al. 2019

Exp. Comput. Multiph. Flow

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show abstract

“…They found that increasing the diverging angle reduced the diameter of produced bubbles, except the cases of high liquid flow rates. Zhao et al [20] conducted experiments with rectangular cross-section Venturi bubble generators with three diverging angles (7.5 • , 10.0 • , and 12.5 • ) and their conclusion was very much similar to Lee et al [19].…”

Section: The Effect Of Geometrical Parameters On Average Bubble Diameter and Bubble Diameter Distributionmentioning

confidence: 56%

“…For the l/d ratio, the results from Reichmann et al [9] and Huang et al [10] showed that bubble diameter reduced with higher l/d ratio while the results from Unyaphan et al [18] did not support this conclusion. For the diverging angle, Lee et al [19] and compared the bubble diameter produced from five Venturi tubes with different diverging angles in the range of 15 • -45 • . They found that increasing the diverging angle reduced the diameter of produced bubbles, except the cases of high liquid flow rates.…”

Section: The Effect Of Geometrical Parameters On Average Bubble Diameter and Bubble Diameter Distributionmentioning

confidence: 99%

Geometrical Optimization of a Venturi-Type Microbubble Generator Using CFD Simulation and Experimental Measurements

Wilson

Pun

Ganesan

et al. 2021

Designs

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Microbubble generators are of considerable importance to a range of scientific fields from use in aquaculture and engineering to medical applications. This is due to the fact the amount of sea life in the water is proportional to the amount of oxygen in it. In this paper, experimental measurements and computational Fluid Dynamics (CFD) simulation are performed for three water flow rates and three with three different air flow rates. The experimental data presented in the paper are used to validate the CFD model. Then, the CFD model is used to study the effect of diverging angle and throat length/throat diameter ratio on the size of the microbubble produced by the Venturi-type microbubble generator. The experimental results showed that increasing water flow rate and reducing the air flow rate produces smaller microbubbles. The prediction from the CFD results indicated that throat length/throat diameter ratio and diffuser divergent angle have a small effect on bubble diameter distribution and average bubble diameter for the range of the throat water velocities used in this study.

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“…Moreover, microbubbles are of interest in water and wastewater treatment as nanobubbles take longer to rise to the top while macro bubbles are inefficient due to their high rising velocity (Sadatomi et al 2005;Basso et al 2018). They have adsorbent properties as they can adsorb and agglomerate particulate matter due to their bigger surface area and their negative charge (Lee et al 2019) which neutralizes repulsion forces between suspended matter. When bubbles and suspended particles are similar in size, maximum collision efficiency is achieved (Han 2002).…”

Section: Diffuser Bubble Formation and Dynamics: Efficacy In Flotation Systemsmentioning

confidence: 99%

“…Recently, Lee et al (2019) investigated bubble generation at different entry and exit angles. Notably; the nozzles were synthesized using 3D printing specifically using acrylonitrile butadiene styrene (ABS) resin with an aluminium cover casing.…”

Section: Materials Of Construction Used In Diffuser Manufacturingmentioning

confidence: 99%

Influence of diffuser design on selected operating variables for wastewater flotation systems: a review

Mukandi

Basitere

Okeleye

et al. 2021

Water Practice and Technology

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Air diffusers or spargers have since been used in separation processes that include conventional wastewater treatment. Over the years, there has been advancements in diffuser design in terms of shape, pore size, orientation and materials of construction as a way of mitigating challenges such as fouling, clogging, energy consumption and poor system efficiency. Some of the available air diffusers are inadequate to solve most of these challenges due to reduced quality and increased quantity of wastewater being treated. Additionally, there is a paucity of information regarding air diffuser design and their effect on operational parameters in wastewater treatment. This review seeks to address the advancement in diffuser design and also the effects of design factors including parameters of air diffusers with a focus of their use in a column flotation system for wastewater treatment.

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Experimental investigation of microbubble generation in the venturi nozzle

Cited by 50 publications

References 14 publications

A review on bubble generation and transportation in Venturi-type bubble generators

A review on bubble generation and transportation in Venturi-type bubble generators

Geometrical Optimization of a Venturi-Type Microbubble Generator Using CFD Simulation and Experimental Measurements

Influence of diffuser design on selected operating variables for wastewater flotation systems: a review

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