Development of an efficient buoyant jet integral model of a bubble plume coupled with a population dynamics model for bubble breakup and coalescence to predict the transmission loss of a bubble curtain

Bohne, Tobias; Grießmann, Tanja; Rolfes, Raimund

doi:10.1016/j.ijmultiphaseflow.2020.103436

Cited by 13 publications

(8 citation statements)

References 34 publications

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“…The FE module, including the pile, water, soil and bubble layer described by the bubble dynamic model is used for the noise source generation and propagation. Subsequently, the bubble size distribution is optimized by the two fractions of bubbles, namely large and small bubbles in (Bohne et al, 2020). The results showed a reasonable agreement with the measurement data.…”

supporting

confidence: 64%

“…The model describes a turbulent two-phase bubble flow, in which the bubble plume is developed from a nozzle and followed by the breakup and coalescence of bubbles. The modeling of the bubble formation is based on an existing model developed by (Bohne et al, 2019(Bohne et al, , 2020. Based on the airflow velocity through each nozzle derived from the pneumatic model, the input for the hydrodynamic model can be determined for a single bubble curtain configuration.…”

Section: Hydrodynamic and Acoustic Model For Air-bubble Curtainmentioning

confidence: 99%

“…The results after solving the set of equations include the half-width of bubble curtain b, gas fraction ϵ gm1 and ϵ gm2 , flow velocity u lzm , and mean bubble volume v 1 and v 2 , which vary with the depth z. The expressions for the vector of the integral fluxes m(u,z) and the integral source term q(u,z) are presented in detail in (Bohne et al, 2020;Peng et al, 2021b) and are omitted here for the sake of simplicity.…”

Section: Hydrodynamic and Acoustic Model For Air-bubble Curtainmentioning

confidence: 99%

“…The performance of the air-bubble curtains can vary significantly in azimuth direction due to the inherent variations in the airflow circulation through the perforated pipes positioned on the seabed surface. As the air flow rate through the nozzle can have a significant impact on bubble generation and development, there is a need to determine the flow velocity of the air as generation and the development of the bubble curtain are sensitive to the initial conditions at the nozzle (Bohne et al, 2020).…”

mentioning

confidence: 99%

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A multi-physics approach for modelling noise mitigation using an air-bubble curtain in impact pile driving

Peng,

Jarquin Laguna,

Tsouvalas

2023

Front. Mar. Sci.

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Underwater noise from offshore pile driving has raised significant concerns over its ecological impact on marine life. To protect the marine environment and maintain the sustainable development of wind energy, strict governmental regulations are imposed. Assessment and mitigation of underwater noise are usually required to ensure that sound levels stay within the noise thresholds. The air-bubble curtain system is one of the most widely applied noise mitigation techniques. This paper presents a multi-physics approach for modeling an air-bubble curtain system in application to offshore pile driving. The complete model consists of four modules: (i) a compressible flow model to account for the transport of compressed air from the offshore vessel to the perforated hose located in the seabed; (ii) a hydrodynamic model for capturing the characteristics of bubble clouds in varying development phases through depth; (iii) an acoustic model for predicting the sound insertion loss of the air-bubble curtain; and (iv) a vibroacoustic model for the prediction of underwater noise from pile driving which is coupled to the acoustic model in (iii) through a boundary integral formulation. The waterborne and soilborne noise transmission paths are examined separately, allowing us to explore the amount of energy channeled through the seabed and through the bubble curtain in the water column. A parametric study is performed to examine the optimal configuration of the double bubble curtain system for various soil conditions and pile configurations. Model predictions are compared with measured data. The model allows for a large number of simulations to examine different configurations of a single bubble curtain and a double big bubble curtain.

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supporting

confidence: 64%

Section: Hydrodynamic and Acoustic Model For Air-bubble Curtainmentioning

confidence: 99%

Section: Hydrodynamic and Acoustic Model For Air-bubble Curtainmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

A multi-physics approach for modelling noise mitigation using an air-bubble curtain in impact pile driving

Peng,

Jarquin Laguna,

Tsouvalas

2023

Front. Mar. Sci.

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“…Typical cases of engineering applications include the noise reduction effect achieved by creating a bubble curtain, the mixed water supply heaters in thermodynamic power plants, and the vaporization cooling of steel billets in steel plants. The bubble movement characteristics in the liquid phase affect the efficacy of gas-liquid two-phase reactors [1][2][3][4][5] . Research on the ascending characteristics and relevant kinetics of bubbles in water will offer basic data for understanding the bubble intensified mixing effect in vertical channels, and is significant for promoting efficient operation of relevant reactors, improving heat and mass transfer, and guiding the process conditions of chemical industry and nuclear energy [6][7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Ascending motion of bottom-blown bubbles in vertical channels

Zhao

Liu

et al. 2023

Preprint

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The gas-liquid two-phase flow is widely applied in engineering. Studying the bubble movement in the liquid phase is valuable for achieving efficient operation of relevant reactors. In this study, the ascending morphology of single-pore bubbles and double-pore bubbles in liquids was photographed by building a visualization experimental setup. Together with MATLAB, the effects of different variables on the ascending of bottom-blown bubbles were analyzed. Experimental results showed the bubble departure diameter was enlarged with the increase of pore inner diameter. At larger pore inner diameter, the bubble orbits were more disorderly, and the ultimate bubble velocity was smaller. At larger gas flow rate, the orbit of single bubbles was closer to a straight line, and the disturbance of double bubbles was intensified, leading to coalescence. The ultimate bubble velocity in water was accelerated with the increase of gas flow rate, and when the number of pores changed, the flow rate was more influential than the pore inner diameter on the ultimate bubble velocity. The centroid orbits of single bubbles were not significantly different between the two liquid-phase conditions, but the swinging amplitude of double bubbles in water was smaller than that in the 0.75% NaCl solution. The horizontal velocities were not significantly different, but the first velocity and ultimate velocity of bubbles at the vertical level in the 0.75% NaCl solution were both larger than those in water. These findings offer basic data for research on bubble strengthening and blending effects in vertical channels.

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