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

Lo, Wei Cheng; Yang, Chi Chin; Hsu, Su Ming; Chen, Chu Hui; Yeh, Chih-Hung; Hilpert, Markus

doi:10.1002/2016wr018833

Cited by 24 publications

(18 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hassanizadeh et al () calculated approximate values of τ , ranging from 3 × 10 4 to 5 × 10 7 Pa s, based on published experimental studies of dynamic capillarity effect. The values of τ in numerical (see Diamantopoulos & Durner, ; Joekar‐Niasar & Hassanizadeh, , for a review) and experimental studies (e.g., Bottero et al, ; Camps‐Roach et al, ; Das & Mirzaei, ; Goel & O'Carroll, ; Lo et al, ; O'Carroll et al, ; Sakaki et al, ) have been mostly within this range. Part of the variation in reported values can be explained by the fact that τ depends on saturation.…”

Section: Introductionmentioning

confidence: 97%

Experimental Investigation of Hysteretic Dynamic Capillarity Effect in Unsaturated Flow

Zhuang

Hassanizadeh

Qin

et al. 2017

Water Resources Research

View full text Add to dashboard Cite

The difference between average pressures of two immiscible fluids is commonly assumed to be the same as macroscopic capillary pressure, which is considered to be a function of saturation only. However, under transient conditions, a dependence of this pressure difference on the time rate of saturation change has been observed by many researchers. This is commonly referred to as dynamic capillarity effect. As a first‐order approximation, the dynamic term is assumed to be linearly dependent on the time rate of change of saturation, through a material coefficient denoted by τ. In this study, a series of laboratory experiments were carried out to quantify the dynamic capillarity effect in an unsaturated sandy soil. Primary, main, and scanning drainage experiments, under both static and dynamic conditions, were performed on a sandy soil in a small cell. The value of the dynamic capillarity coefficient τ was calculated from the air‐water pressure differences and average saturation values during static and dynamic drainage experiments. We found a dependence of τ on saturation, which showed a similar trend for all drainage conditions. However, at any given saturation, the value of τ for primary drainage was larger than the value for main drainage and that was in turn larger than the value for scanning drainage. Each data set was fit a simple log‐linear equation, with different values of fitting parameters. This nonuniqueness of the relationship between τ and saturation and possible causes is discussed.

show abstract

Section: Introductionmentioning

confidence: 97%

Experimental Investigation of Hysteretic Dynamic Capillarity Effect in Unsaturated Flow

Zhuang

Hassanizadeh

Qin

et al. 2017

Water Resources Research

View full text Add to dashboard Cite

show abstract

“…Acoustic excitation effects: Regardless of the mainstream reviewed above, some special boundary conditions raised research interests and are worth to be studied. One contribution from Lo, et al [186] navigated the investigations in the dynamic response of soil water retention behaviour to a novel orientation. Instead of exclusively diving into studying hydraulic boundary conditions, Lo, Yang, Hsu, Chen, Yeh and Hilpert [186] applied acoustic excitations to transient drainage tests on Ottawa sand.…”

Section: The Influential Factors In Dynamic Nonequilibrium Effectmentioning

confidence: 99%

Transient Two-Phase Flow in Porous Media: A Literature Review and Engineering Application in Geotechnics

Yan

Galindo‐Torres

et al. 2022

Geotechnics

View full text Add to dashboard Cite

This work reviews the transient two-phase flow in porous media with engineering applications in Geotechnics. It initially overviews constitutive relationships, conventional theories, and experiments. Then, corresponding limitations are discussed according to conflicting observations and multiphase interfacial dynamics. Based on those findings, the dynamic nonequilibrium effects were so defined, which could also be abbreviated as dynamic/transient effects. Four advanced theories have already been developed to resolve these effects. This review collects them and discusses their pros and cons. In addition, this work further reviews the state-of-art in terms of experimental methods, influential factors in dynamic/transient effects, and modelling performance, as well as micromodel and numerical methods at pore-scale. Last, the corresponding geotechnical applications are reviewed, discussing their applicability in effective stress, shear strength, and deformation. Finally, the entire review is briefed to identify research gaps in Geotechnics.

show abstract

“…Camps-Roach et al (2010) suggested that the DCP effect should be considered when the saturation changed rapidly and the effect of wettability on the DCP coefficient should be investigated. Lo et al (2017) found that acoustic excitation also had a notable effect on the DCP coefficient based on their experiment results, while the essential reason was still unclear. Zhuang et al (2017) carried out a series of drainage experiments to quantify the dynamic capillary coefficient, and found that the DCP coefficient varied slightly at moderate level and increased nearly logarithmically with the decrease of saturation.…”

Section: Introductionmentioning

confidence: 99%

Upscaling of Dynamic Capillary Pressure of Two‐Phase Flow in Sandstone

Tang

Zhan

et al. 2019

Water Resources Research

View full text Add to dashboard Cite

Dynamic capillary pressure (DCP) is the capillary pressure defined under transient flow condition during displacement, and it is vital for predicting two‐phase behavior in porous media. This article studies the effect of pore scale force and interfacial area by using captivating Lattice Boltzmann method based on a pseudo‐potential model developed for simulating incompressible multiphase flow in porous media. We analyze the relationship between pore scale forces and DCP based on the energy conservation law and define DCP as a function of energy rate of pressure and viscosity of each phase. We present two‐phase displacement simulations on a computed tomography (CT) image‐based porous model and analyze the effects of injection rate and wettability on DCP based on the proposed upscaling method, where the wettability is defined as the contact angle of the nonwetting phase. The primary results show that (1) the DCP curves are higher than that of the quasi‐static capillary pressure, and a higher injection rate leads to a larger DCP and a faster saturation change. (2) Significant effects of wettability on DCP and the DCP coefficients are observed, where the DCP coefficient is defined as the ratio of the difference between DCP and static capillary pressure over the rate of change of saturation. A larger contact angle results in a higher DCP and a lower change rate of saturation, and consequently induces a larger DCP coefficient. The average DCP coefficient is found to vary from 4.56 × 106 to 3.55 × 105Pa · ms when the nonwetting phase contact angle changes from 140° to 105° in the saturation range of 0.3 to 0.8. This study indicates that the proposed upscaling method is valid to investigate the DCP of two‐phase flow in sandstone.

show abstract

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

Cited by 24 publications

References 66 publications

Experimental Investigation of Hysteretic Dynamic Capillarity Effect in Unsaturated Flow

Experimental Investigation of Hysteretic Dynamic Capillarity Effect in Unsaturated Flow

Transient Two-Phase Flow in Porous Media: A Literature Review and Engineering Application in Geotechnics

Upscaling of Dynamic Capillary Pressure of Two‐Phase Flow in Sandstone

Contact Info

Product

Resources

About