Unsteady numerical simulation of gas-liquid flow in dual chamber microbubble generator

Bahrudin,; Sugiarto, Anto Tri; Redhyka, Grace Gita

doi:10.1109/icacomit.2017.8253401

Cited by 3 publications

(6 citation statements)

References 6 publications

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“…The simulations conducted by Sharma et al [61] and Alam et al [26] employed the Reynolds-Averaged Navier-Stokes (RANS) equations to model swirl flow. The turbulence model employed the k-ε equations, including momentum, continuity, and energy conservation equations.…”

Section: Methodsmentioning

confidence: 99%

“…In swirl-type Microbubble Generators (MBG) employing tangential inlets, the variation in swirling velocity results in increased shear stress. This shear stress is utilized to break down the bubbles into smaller sizes [2], [26], [30], [53]. Forces such as friction, lift, additional mass, and turbulent dispersion on the MBG will significantly influence the movement, deformation, and breakup of moving bubbles [59], [93].…”

Section: Mechanism Of Bubble Formation From Swirling Flowmentioning

confidence: 99%

“…The tangential flow method has garnered significant attention for its capability to produce relatively small-sized bubbles and its simple construction, making it easily manufacturable [25]. The operational principle involves pressurized fluid being tangentially introduced into a cylinder to create a swirling flow [2], [26]. As the velocity increases, following Bernoulli's principle of energy conservation, the rise in velocity (kinetic energy) at a certain point in the flow results in reduced pressure [27].…”

Section: Introductionmentioning

confidence: 99%

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Review on swirl-type microbubble generator: Concept, technology, and applications

Mawarni,

Ristiyanto,

Deendarlianto

et al. 2023

Mech. Eng. for Soc. and Ind.

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The Microbubble Generator (MBG) is an aeration technology capable of producing micron-sized bubbles. Several researchers have conducted previous studies and developed various types related to the microbubble generator. The swirl-type microbubble generator has demonstrated advantages over other types. It has been widely explored recently due to its simple structure, efficiency in producing micron-sized bubbles, and potential applications across various fields. Therefore, this article reviews recent developments in swirl-type bubble generator research, encompassing the definition of microbubbles, methods for generating microbubbles through experimental and numerical approaches, the performance of microbubble generators, and their applications. Based on optimized geometric parameters combined with appropriate flow conditions, the swirl-type bubble generator is predicted to produce bubbles with controlled sizes and concentrations that meet specific requirements. However, further studies are needed to delineate the fluid-gas interactions comprehensively.

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Section: Methodsmentioning

confidence: 99%

Section: Mechanism Of Bubble Formation From Swirling Flowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Review on swirl-type microbubble generator: Concept, technology, and applications

Mawarni,

Ristiyanto,

Deendarlianto

et al. 2023

Mech. Eng. for Soc. and Ind.

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“…Penggunaan gelembung mikro pada sistem stelisisasi ini berfungsi meningkatkan efisiensi dan konsentrasi penggunaan gas ozone. Perkembangan penelitian dan pengembangan terkait PGM di Indonesia telah cukup banyak dilakukan [12,13]. Akan tetapi produksi PGM ini mengalami kendala dalam hal karakterisasi distribusi ukuran gelembung mikro yang dihasilkan [14].…”

Section: Pendahuluanunclassified

Pengembangan Karakterisasi Gelembung Mikro Menggunakan Metode PIV beserta Pemantauan dengan IOT

Salim

Juliastuti

Nadhira

2021

RESTI

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The development of microbubble technology has been widely used in various fields. One of these areas is sterilization technology using microbubbles to speed up and increase the effectiveness of the sterilization process. One example is room sterilization using vaporized ozone gas microbubbles which can minimize the spread of the Covid-19 virus. However, research and development of microbubbles are still not much related to the characterization of their size and hydrodynamic properties. In this study, we propose the development of a continuous characterization of the size of microbubbles using the image analysis method. Image analysis aims to find the displacement vector using particle image velocimetry (PIV) techniques. The Hadamard-Rybczynski equation was used to calculate the size of the microbubbles based on the rising velocity vector of the microbubbles. The image capture process uses an LED light shadow technique to get a brighter and more stable image. The template matching algorithm is used to speed up the displacement vector analysis process used in the PIV technique. The analysis process is carried out in-situ in parallel processing using the python program on the raspberry pi4 unit. The analysis process uses three program services that run parallel, namely recording, pre-processing, and processing services. The measurement process uses three validations, namely pixel validation, template matching algorithm validation, and interrogation window. Bubble size data is displayed in the form of real-time graphs and size distribution histograms online using IoT. The test results show the size distribution of the microbubbles produced has an average of 14.60 µm with a deviation value of 0.11µm.

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“…Takahashi et al [15] conformed that the microbubbles having the peak of distribution around 25 μm in diameter can be formed using swirl fow. Alam et al [18,19] used unsteady numerical CFD simulation to visualize the characterization of the gas-liquid fow phenomenon in a dual chamber microbubble generator. According to the CFD results, the self-suction mechanism is clearly generated as a consequence of the swirl fow of liquid in the inner area of the vacuum chamber.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Simulation Assessment of Inlet Configuration Influence on Enhancing Swirl Flow Microbubble Generator Performance

Al-Azzawi,

Al-Shimmery,

Alshara

et al. 2023

Journal of Engineering

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In this study, a CFD simulation analysis was used to predict the characteristics of a swirl flow as a reference to optimize a new design of microbubble generator. To examine the impact of the inlet design, three different configurations of the inlet type were applied, namely single inlet, double inlet, and tangent-circle inlet. The performance of the microbubble generator was characterized in terms of swirl velocity, pressure drop in radial position, and pressure distribution along the central axis of the microbubble generator. Generally, the CFD analysis succeeded to visualize the hypothetical bath of the flow streamlines inside the microbubble generators. The results illustrated that the swirl flow in the tangent-circle inlet was able to generate a negative pressure zone in the central area of the generator (i.e., self-suction mechanism). In addition, the tangent-circle inlet showed a high-pressure drop compared with the single inlet microbubble generator. Although the double inlet microbubble generator illustrated a high-pressure drop between the inlet and the outlet, the streamlines distribution was focused only on the top part of the microbubble generator. This was a reason why the self-suction mechanism was not well defined.

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Unsteady numerical simulation of gas-liquid flow in dual chamber microbubble generator

Cited by 3 publications

References 6 publications

Review on swirl-type microbubble generator: Concept, technology, and applications

Review on swirl-type microbubble generator: Concept, technology, and applications

Pengembangan Karakterisasi Gelembung Mikro Menggunakan Metode PIV beserta Pemantauan dengan IOT

Computational Fluid Dynamics Simulation Assessment of Inlet Configuration Influence on Enhancing Swirl Flow Microbubble Generator Performance

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