Theoretical and experimental study of resonance of blobs in porous media

Hsu, Su Ming; Katz, Joseph; Hilpert, Markus

doi:10.1190/geo2012-0043.1

Cited by 15 publications

(11 citation statements)

References 45 publications

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“…[] experimentally showed that dynamic contact angle could be part of the result in the difference between the capillary pressures measured in the static and dynamic conditions. Pore‐scale experimental studies have shown that the contact angle varies when the fluid‐fluid interface oscillates by adding acoustic excitations in porous media of capillary tube and sphere packing [ Charlaix and Gayvallet , ; Hsu et al ., ]. The change in contact angle of the air‐water interface may be responsible for the decrease in capillary pressure induced by acoustic excitations under a dynamic condition.…”

Section: Resultsmentioning

confidence: 99%

“…Seismic waves and their attenuation and dispersion resulting from wave‐induced flow in porous media were studied and used to assess the amount of nonaqueous phase liquid (NAPL) pollutants in the subsurface [ Li et al ., ; Müller et al ., ; Steeb et al ., ]. Low‐frequency seismic waves have been shown to enhance fluid flow and NAPL flow, increasing the efficiency of pollutant remediation in the unsaturated zone and oil recovery [ Nikolayevskiy , ; Reddi , ; Hilpert et al ., ; Roberts et al ., ; Beresnev , ; Chrysikopoulos and Vogler , ; Iassonov and Beresnev , ; Hilpert , ; Hsu et al ., ; Lo et al ., ; Deng and Cardenas , ; Karve and Kallivokas , ]. Lo et al .…”

Section: Introductionmentioning

confidence: 97%

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The dynamic response of the water retention curve in unsaturated soils during drainage to acoustic excitations

Yang

Hsu

et al. 2017

Water Resources Research

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We examined the effects of acoustic excitations on the water retention curve, i.e., the relationship between capillary pressure (PCtrue) and water saturation true(SWtrue) in unsaturated porous media, during drainage. The water retention curves were measured under static and dynamic conditions, where water was withdrawn from a sandbox with three different pumping rates, 12.6, 19.7, and 25.2 mL/s. Excitations with frequencies of 75, 100, 125, and 150 Hz were applied. The acoustic excitations had no effect on the static water retention curve but altered the dynamic water retention curve. The acoustic excitations lowered the dynamic PC, especially under the dynamic condition where the pumping rate was 25.2 mL/s and when SW varied between 0.6 and 0.95. The differences between the capillary pressures measured under static and dynamic conditions decreased when acoustic excitations were applied. We link this finding to the change in contact angle induced by the acoustic excitation. The dynamic coefficients, τ, for the dynamic water retention curves that we fitted to the experimental data were smaller with than without acoustic excitations. We attribute the decrease of the dynamic coefficient to the combination of the increase in the permeability and the decline in the air‐entry pressure caused by adding acoustic excitations.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

The dynamic response of the water retention curve in unsaturated soils during drainage to acoustic excitations

Yang

Hsu

et al. 2017

Water Resources Research

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“…Neglecting the mass of the wetting fluids would cause Model II to deviate from the physics for analyzing the immiscible‐fluid‐oscillation system. In addition to the scenario of sliding oscillation (oscillation with a moving contact line) in the study, the mass of all fluid slugs in the pinned oscillation (oscillation of the meniscus with a fixed contact line) should also be embedded in the expression of natural frequency (Hsu et al, 2012). Therefore, the mass of all fluids should be considered in the analysis of the immiscible‐fluid‐oscillation system.…”

Section: Resultsmentioning

confidence: 99%

Effect of Subsurface Microseisms on the Motion of Dispersed Droplets in Pores

Zeng

Deng

2020

JGR Solid Earth

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Human-induced seismicity has drawn substantial attention in recent years. The effect of seismicity on subsurface structures has been studied extensively. However, the effect of seismicity, especially microseismicity, on surrounding immiscible fluids is rarely investigated. In porous media with two or more immiscible fluids, different amplitudes of vibration induced by seismicity have distinct effects on the dynamic behavior of the fluids. Three types of pore-scale models are prevalent for analyzing the motion of immiscible droplets. The underlying assumptions and accuracy of these models are compared in this study in both the frequency and time domains. The frequency domain analysis shows that resonance can be addressed in all three of the models; the frequency response curves, however, present significant differences, which are attributed to the missing physics considered in some models. Time domain analysis is performed in both small-amplitude and large-amplitude oscillation. The nonlinearity in large-amplitude oscillation is attributed to the constricted geometry of the capillary tube. Although the term "large-amplitude" is used in this study, the corresponding amplitude is still within the amplitude range of microseisms. The momentum balance model is identified as the most accurate oscillatory model so far in comparison with computational fluid dynamics simulations. In addition, the potential approach to incorporate this pore-scale model in seismic wave attenuation analysis is found to be possible. The frequency correction function and structural factor are calculated to embed the momentum balance model into Biot's poroelastic model. The resonance of the dispersed phase can also be addressed theoretically in porous media of random packed spheres.

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“…The dynamics of single discontinuous oil blobs and geometrical more complex clusters of wetting fluids have been investigated on the pore scale level by Hilpert et al (2000) and Hsu et al (2012). Recently, (multiscale) continuum models were proposed for acoustic waves in residual saturated porous media, Steeb et al (2010) and Steeb et al (2012).…”

Section: Introductionmentioning

confidence: 99%

Wave Propagation in Residual Saturated Porous Rocks - A Multiscale Approach

Steeb

Kurzeja

2013

Poromechanics V

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Phase velocities and dispersion of acoustic waves in residual saturated porous rocks are affected by material properties of the solid skeleton (porosity, skeleton and grain stiffness) and properties of the inherent pore fluids (viscosities, bulk moduli) as well as the morphology of saturation. A multiscale continuum model describing acoustic waves in porous rocks saturated with a continuous gas phase and a discontinuous liquid (water or oil) phase is analysed. Dispersion relations for the P-waves are shown and compared with Biot's poroelastic approach. It is observed, that negative partial densities occur close to the resonance frequency of the liquid phase. The analogy with acoustic metamaterials is discussed.

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Theoretical and experimental study of resonance of blobs in porous media

Cited by 15 publications

References 45 publications

The dynamic response of the water retention curve in unsaturated soils during drainage to acoustic excitations

The dynamic response of the water retention curve in unsaturated soils during drainage to acoustic excitations

Effect of Subsurface Microseisms on the Motion of Dispersed Droplets in Pores

Wave Propagation in Residual Saturated Porous Rocks - A Multiscale Approach

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