Design and experimental evaluation of a Venturi and Venturi-Vortex microbubble aeration system

Ochoa, Esteban De Oro; García, Mauricio Carmona; Padilla, Néstor Durango; Remolina, Andrés Martínez

doi:10.1016/j.heliyon.2022.e10824

Cited by 8 publications

(6 citation statements)

References 14 publications

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“…When the dissolved oxygen was measured in previous research, the oxygen concentration was not above the saturation limit for a typical venturi-type FBG [14]. The oxygen absorption rate improved when an internal obstacle was added in Venturi-type FBGs.…”

Section: Gas Absorption Performancementioning

confidence: 87%

“…De Oro Ochoa and coworkers evaluated Venturi and Venturi-Vortex microbubble aeration systems experimentally. The use of the Venturi-Vortex generator attained values of standard volumetric mass transfer coefficient, oxygen transfer rate, and aeration efficiency higher than the Venturi generator because the former provided a contact area with the water larger than the latter [14].…”

Section: Venturi-type Fb Generatorsmentioning

confidence: 92%

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Experimental evaluation of 3D printed Venturi-type Fine Bubble Generators with internal obstacles

Toma,

Ikemoto,

Batalu

et al. 2023

Preprint

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The generation of Fine Bubbles (FB) using Venturi-type nozzles has been researched experimentally and mathematically using CFD simulations. Nevertheless, little has been discussed about the addition of obstacles in the convergent or divergent parts of the nozzle. Therefore, this research evaluates the performance of six fine bubble generation nozzles that were designed using cloud-based 3D modeling software and 3D printing. The designed nozzles were evaluated in terms of macroscopic features measured through oxygen gas absorption experiments and microscopic features such as size distribution and zeta potential measurements. Moreover, two indexes were proposed based on the gas absorption dynamic responses. These indexes were included in three objective functions that can be solved as mono-objective or multi-objective optimization problems. The nozzles with the best performance were evaluated regarding size distribution and zeta-potential. The results showed that installing obstacles in the divergent part of the nozzle attained higher gas absorption, smaller size of ultra fine bubbles (UFB), and more negative zeta potential.

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Section: Gas Absorption Performancementioning

confidence: 87%

Section: Venturi-type Fb Generatorsmentioning

confidence: 92%

Experimental evaluation of 3D printed Venturi-type Fine Bubble Generators with internal obstacles

Toma,

Ikemoto,

Batalu

et al. 2023

Preprint

View full text Add to dashboard Cite

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“…They were also utilized as an imaging contrast agent to improve the assessment in imaging exams. In wastewater treatment, microbubbles had a high potential for the dissolution of oxygen, fragmentation of organic particles, floatation of minerals, and suppression of microalgae growth [2][3][4]. For these purposes, air or gas was introduced to the flowing liquid, and aeration was executed.…”

Section: Introductionmentioning

confidence: 99%

Effect of throat diameter on the cavitation phenomenon inside an aerated Venturi tube for microbubble production

Hamdan,

Kaneko

2024

Preprint

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Aeration in Venturi tubes for microbubbles production has become popular in recent years as it enhanced the transportation of oxygen and other gases in wastewater treatment and mineral engineering. In an aerated Venturi, air/gas was injected upstream into the flowing liquid inside the Venturi tube. The air, flows inside the Venturi tube as bubbles, before breakup occurs downstream after the throat area. This method promoted the transportation of particular gases or substances in microbubbles. To further increase the generation of microbubbles, flowing liquid velocity was increased by decreasing the throat diameter, but cavitation started to emerge inside the tube as velocity increased. This present study aims to investigate the effect of reducing the throat diameter on the cavitation number of the aerated Venturi tube and how it affects the breakup characteristics of bubbles. Activities involved in the investigation were; visualization of flow and generated microbubbles, image processing of the images captured, pressure and void fraction measurement, and calculating the cavitation number. The result showed that reducing the throat diameter initiated the cavitation occurrence earlier, and in aerated cases, cavitation exists in the form of cavitated bubbles. Aeration also affects the cavitation number in a non-cavitated flow but does not significantly affect the existing cavitated flow. Reducing the throat diameter also successfully increased the generation of bubbles less than 0.2 mm but the overall SMD did not show a straightforward relationship with cavitation number.

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“…In conclusion, the authors emphasised that the venturi device was a very suitable weight for aeration. Yadav and Roy [21]; Reda Hamed [22]; Ochoa [23] also investigated the aeration efficiency of the venturi device.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the aeration performance of water jet which is performed by a venturi device

Koçyiğit,

Emiroğlu

2023

DÜMF MD

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The purpose of aeration in water is to transfer or remove gases from the water. Dissolved oxygen is critical for living life. In water engineering, aeration and oxygen transfer using water jets are common. In this study, various venturi nozzles with air holes in the throat portion were manufactured and meaningful experiments were conducted to determine their oxygen transfer efficiency and aeration performance., the venturi nozzles with throat diameters 14, 17 and 20 mm were used in the experimental study. The ratio of the diameter of the air holes to the diameter of the throat portion is taken as 0.1, 0.2 and 0.3. Different experiments were carried out for nine different hole diameters. In addition, the ratio of the throat portion length to the throat portion diameter was taken as 1.00 and 0.50. In addition, comprehensive experiments were carried out by considering the ratio of outlet length to outlet diameter for all nozzles, 1 and 2, and for one venturi, 1, 2, 3, 4 and 5. The experiments were also conducted for the circular nozzle to make comparisons. In this study, venturi nozzles gave better results than circular nozzles, and higher aeration performance values were obtained for the ratios 0.2 and 0.3, 1, 0.50 and 0.50. It was found that the aeration performance of the venturi nozzle was approximately 6.5 times higher than the air entrainment rate performance of the circular nozzle and 2.5 times higher in terms of oxygen transfer.

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Design and experimental evaluation of a Venturi and Venturi-Vortex microbubble aeration system

Cited by 8 publications

References 14 publications

Experimental evaluation of 3D printed Venturi-type Fine Bubble Generators with internal obstacles

Experimental evaluation of 3D printed Venturi-type Fine Bubble Generators with internal obstacles

Effect of throat diameter on the cavitation phenomenon inside an aerated Venturi tube for microbubble production

Experimental study on the aeration performance of water jet which is performed by a venturi device

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