Acoustic wave incidence on a multilayer medium containing a bubbly fluid layer

Gubaidullin, D. A.; Fedorov, Yu. V.

doi:10.1134/s0015462817010100

Cited by 13 publications

(7 citation statements)

References 12 publications

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“…The pore pressure and stress waves exhibit dissipative and dispersive behaviors [24,[46][47][48]. The amplitude-curve crossovers are due to the spatial superposition of the confined waves acting like interference patterns [45,49]. As can be seen in Figure 6(b), the amplitudes of pore pressure and stress are insensitive to the value of the added-mass coefficient.…”

Section: Phase Velocity and Damping Of The First And Secondmentioning

confidence: 94%

Propagation of Pore Pressure and Stress in Saturated Porous Media Based on a Darcy-Brinkman Formulation

Yang

Zhang

2021

Geofluids

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Propagation of pore pressure and stress in water-saturated elastic porous media is theoretically investigated when considering the Darcy-Brinkman law. The wave mode, phase velocity, phase lag, damping factor, and characteristic frequency are found from the updated mathematic model. The Brinkman term describes the fluid viscous shear effects and importantly contributes to the dispersion relation and wave damping. The coincidence of the properties of Biot waves of the first and second kinds occurs at a characteristic frequency, which is remarkably influenced by the Brinkman term. A key finding is that, compared to the Darcy-Brinkman law, Darcy’s law overestimates the phase velocity, damping, and phase lag of the first wave, while underestimates the phase velocity, damping, and phase difference of the second wave. The introduction of the Darcy-Brinkman law yields an improved description of the damping of the compressional wave modes in saturated porous media.

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Section: Phase Velocity and Damping Of The First And Secondmentioning

confidence: 94%

Propagation of Pore Pressure and Stress in Saturated Porous Media Based on a Darcy-Brinkman Formulation

Yang

Zhang

2021

Geofluids

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“…The propagation of acoustic waves in complex, layered media has been widely investigated for many years, and layered media containing bubbly liquid have also attracted much attention [7][8][9]. Research on the reflection and transmission of acoustic waves in these complex media is of great significance.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Studies of Acoustic Reflection of Bubbly Liquid in Multilayer Media

et al. 2022

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Bubbly liquids are widely present in the natural environment and industrial fields, such as seawater near the ocean bottom, the multiphase flow in petroleum reservoirs, and the blood with bubbles resulting in decompression sickness. Therefore, accurate measurement of the gas content is of great significance for hydroacoustic physics, oil and gas resources exploration, and disease prevention and diagnosis. Trace bubbles in liquids can lead to considerable changes in the acoustic properties of gas–liquid two-phase media. Acoustic measurements can therefore be applied for trace bubble detection. This study derived the reflection coefficient of acoustic waves propagating in a sandwich layering model with liquid, bubbly liquid, and liquid. The influences of gas contents on the reflection coefficient at the layer interface were analyzed based on theoretical calculations. It was revealed that the magnitude of the reflection coefficient and the frequency interval between its valleys have a quantitative correlation with the gas contents. Thus, a novel means to detect the contents of trace bubbles was proposed by evaluating the reflection coefficients. The reflection features of a thin layer with bubbly liquid were then studied through experiments. It was validated by acoustical measurements and theories that the reflection coefficient is considerably sensitive to the change of gas contents as long as the gas content is tiny. With the increasing gas content, the maximum value of the reflection coefficient increases; meanwhile, the frequency intervals between the valleys become smaller. However, when the gas content is extensive enough, e.g., greater than 1%, the effect of the change of gas content on the reflection coefficient becomes inapparent. In that case, it is not easy to measure the gas content by the acoustic reflection signals with satisfying precision. This proposed method has potential applications for the detection of trace gas bubble content in several scenarios, e.g., decompression illness prevention and diagnosis.

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“…Let us briefly explain the derivation of equation (2). A system of differential equations that determines the propagation of an acoustic wave in the medium under consideration is recorded.…”

Section: Complex Wave Number For Bubbly Liquidmentioning

confidence: 99%

“…This is due to both natural phenomena, such as, for example, near-bottom or subsurface layers containing gas bubbles in seas and lakes [1][2][3][4][5], layers of fog, dusty gas, containing in atmosphere [6][7][8], and engineering processes [9,10]. The design and parameters of a combined panel consisting of two glasses or polycarbonates with a gap between them filled with a bubbly fluid is described in [10]; this panel is used for the simultaneous information protection in the acoustic, optical, and electromagnetic technical channels.…”

Section: Introductionmentioning

confidence: 99%

Reflection of acoustic waves from the boundary or layer of two-phase medium

2018

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Abstract. The inclined incidence of the acoustic wave on a layer of gas-droplet mixture or bubbly liquid of finite thickness is theoretically investigated. In the case of the incidence of the low-frequency acoustic wave to interface between the pure gas and aerosol or to interface between pure liquid and bubbly liquid the basic laws of reflection and transmission of a wave are established. This circumstance allows us to evaluate the transmission and reflection coefficients, depending on the volume content of inclusions and the angle of incidence of the acoustic wave. In particular, for the interface between pure gas and aerosol analytical expressions of the critical angle of wave incidence at which reflection coefficient becomes zero are obtained, i.e. thus there is a complete passage of the acoustic wave through the interface. It is established that the increase of the angle of incidence of the acoustic wave on the boundary or layer of aerosol causes: first, either to increase or to decrease of the reflection coefficient at low frequencies, and second, to appearance of additional minima depending on the reflection coefficient from frequency of disturbances related to the difference of speed of sound and density of the medium.

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Acoustic wave incidence on a multilayer medium containing a bubbly fluid layer

Cited by 13 publications

References 12 publications

Propagation of Pore Pressure and Stress in Saturated Porous Media Based on a Darcy-Brinkman Formulation

Propagation of Pore Pressure and Stress in Saturated Porous Media Based on a Darcy-Brinkman Formulation

Theoretical and Experimental Studies of Acoustic Reflection of Bubbly Liquid in Multilayer Media

Reflection of acoustic waves from the boundary or layer of two-phase medium

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