Numerical simulation of bubbly flows by the improved lattice Boltzmann method for incompressible two-phase flows

Saito, Satoshi; Yoshino, Masato; Suzuki, Kosuke

doi:10.1016/j.compfluid.2023.105797

Cited by 10 publications

(2 citation statements)

References 53 publications

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“…For example, the size of air bubbles in air-water flow can reach almost 2 mm but still maintaining the spherical shape at 1 atmosphere and room temperature. In the past few decades, bubbly flow has attracted extensive attention due to its important industrial application value and complex physical mechanism [6][7][8]. Among the parameters related to bubbly flow, void fraction is one of the key parameters in engineering applications such as bubbly device design (such as nuclear reactors, and steam boilers) and industrial process control (such as mixing, and drag reduction) [9].…”

Section: Introductionmentioning

confidence: 99%

Measurement of void fraction in gas-water bubbly flow using a derived multi-eigenvalue sequence from normalized EIT impedance matrix

Suo,

Sun,

et al. 2024

Meas. Sci. Technol.

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Void fraction is one of the dominant parameters of gas-water two-phase flow. Its accurate measurement plays an important role in achieving parameter control and reliable operation in industrial processes. This article proposes a more practical method for the measurement of void fraction in gas-water bubbly flow using a derived multi-eigenvalue sequence from normalized EIT impedance matrix. The relations between eigenvalues and void fraction, bubble radius, number of bubbles are investigated by numerical simulations, which illustrates the superiority of using multi-eigenvalue rather than the largest eigenvalue for void fraction prediction. The nonlinear mapping between the multi-eigenvalue sequence and void fraction is established by applying the XGBoost model with a sliding window of time series. This proposed method is verified by static and dynamic experiments using a self-developed setup in our laboratory, generating stable gas-water bubbly flow with void fraction less than 0.12. It is shown that the proposed method can predict void fraction with a relative deviation of 10%. Compared with the conventional method based on largest eigenvalue, the proposed method efficiently improves the measurement accuracy of void fraction in gas-water bubbly flow and applicability in actual measurement of two-phase flow, which can be further extended to other flow regimes.

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Section: Introductionmentioning

confidence: 99%

Measurement of void fraction in gas-water bubbly flow using a derived multi-eigenvalue sequence from normalized EIT impedance matrix

Suo,

Sun,

et al. 2024

Meas. Sci. Technol.

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“…[4] Among all the flow patterns, slug flow attracts more attention because of its broad operating conditions and applications. [5,6] The formation of a bubble is under the combined effect of inertia force, viscous force, and surface tension. The capillary number is a vital parameter that affects the generation of bubbles.…”

Section: Introductionmentioning

confidence: 99%

Simulation of gas–liquid two-phase flow in a flow-focusing microchannel with the lattice Boltzmann method

2023

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A lattice Boltzmann method for gas-liquid two-phase flow involving non-Newtonian fluids is developed. Bubble formation in a flow-focusing microchannel is simulated by the method. The influences of flow rate ratio, surface tension, wetting properties, and rheological characteristics of the fluid on the two-phase flow are analyzed. The results indicate that the flow pattern transfers from slug flow to dry-plug flow with a sufficiently small capillary number. Due to the presence of three-phase contact lines, the contact angle has a more significant effect on the dry-plug flow pattern than on the slug flow pattern. The deformation of the front and rear meniscus of a bubble in the shear-thinning fluid can be explained by the variation of the capillary number. The reduced viscosity and increased contact angle are beneficial for the drag reduction in a microchannel. It also demonstrates the effectiveness of the current method to simulate the gas-liquid two-phase flow in a microchannel.

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A Gaussian–cubic backward substitution method for the four-order pure stream function formulation of two-dimensional incompressible viscous flows

Zhang,

Lin,

Reutskiy

et al. 2023

Engineering with Computers

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Numerical simulation of bubbly flows by the improved lattice Boltzmann method for incompressible two-phase flows

Cited by 10 publications

References 53 publications

Measurement of void fraction in gas-water bubbly flow using a derived multi-eigenvalue sequence from normalized EIT impedance matrix

Measurement of void fraction in gas-water bubbly flow using a derived multi-eigenvalue sequence from normalized EIT impedance matrix

Simulation of gas–liquid two-phase flow in a flow-focusing microchannel with the lattice Boltzmann method

A Gaussian–cubic backward substitution method for the four-order pure stream function formulation of two-dimensional incompressible viscous flows

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