Numerical demonstration of surfactant concentration-dependent capillarity and viscosity effects on infiltration from a constant flux line source

Henry, Eric J.; Smith, James E.

doi:10.1016/j.jhydrol.2006.02.008

Cited by 15 publications

(9 citation statements)

References 44 publications

(44 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mathematical model of Smith and Gillham [] was able to accurately simulate soil water movement and the change in pressure head resulting from surface tension reduction. Henry and Smith [] developed a 2‐D mathematical model that incorporated a modification of the van Genuchten equation based on the scaling approach of Leverett []. Numerical results showed significant differences between the infiltration of pure water and alcohol (70 g/L 1‐butanol)‐containing water into a fine sand.…”

Section: Introductionmentioning

confidence: 99%

Influence of surfactants on unsaturated water flow and solute transport

Karagündüz

Young

Pennell

2015

Water Resources Research

View full text Add to dashboard Cite

Surfactants can reduce soil water retention by changing the surface tension of water and the contact angle between the liquid and solid phases. As a result, water flow and solute transport in unsaturated soil may be altered in the presence of surfactants. In this study, the effects of a representative nonionic surfactant, Triton X-100, on coupled water flow and nonreactive solute transport during unsaturated flow conditions were evaluated. Batch reactor experiments were conducted to measure the surfactant sorption characteristics, while unsaturated transport experiments were performed in columns packed with 40-270 mesh Ottawa sand at five initial water contents. Following the introduction of surfactant solution, the rate of water percolation through the sand increased; however, this period of rapid water drainage was followed by decreased water percolation due to the reduction in soil water content and the corresponding decrease in unsaturated hydraulic conductivity behind the surfactant front. The observed changes in water percolation occurred sequentially, and resulted in faster nonreactive solute transport than was observed in the absence of surfactant. A one-dimensional mathematical model accurately described coupled water flow, surfactant, and solute transport under most experimental conditions. Differences between model predictions and experimental data were observed in the column study performed at the lowest water content (0.115 cm 3 /cm 3 ), which was attributed to surfactant adsorption at the air-water interface. These findings demonstrate the potential influence of surfactants additives on unsaturated water flow and solute transport in soils, and demonstrate a methodology to couple these processes in a predictive modeling tool.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of surfactants on unsaturated water flow and solute transport

Karagündüz

Young

Pennell

2015

Water Resources Research

View full text Add to dashboard Cite

show abstract

“…15) is more pronounced for butanol aqueous solutions than for aqueous mixtures of methanol (Smith and Gillham 1994). In addition, the experiments and simulations carried out by Gillham (1994, 1999), , , and Henry and Smith (2006) involved pure infiltration scenarios, unlike our simulations, which include infiltration and volatilization of the mixture. Flowers and Hunt (2007) studied the effect of density and viscosity on the mixing of brines and groundwater.…”

Section: Sensitivity To Dispersion Analysismentioning

confidence: 88%

“…Although some studies in the literature deal with the modeling of 2D density-, viscosity-, and/or surface tension-dependent flow (Ouyang and Zheng 1999;Rathfelder et al 2001;Henry and Smith 2006), there are none on 2D simulations of non-passive transport of volatile organic compounds in the vadose zone, with several concentrationdependent transport properties. In particular, with the exception of the work by Henry and Smith (2006), there is no experimental or numerical research on non-passive transport effects on infiltration from a line or disk source.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, with the exception of the work by Henry and Smith (2006), there is no experimental or numerical research on non-passive transport effects on infiltration from a line or disk source. Additionally, in modeling studies non-flow boundary conditions are often specified on the soil surface instead of volatilization/evaporation boundary conditions, because the numerical methodology is less complex.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Non-passive Transport of Volatile Organic Compounds Infiltrated from a Surface Disk Source

Silva

Grifoll

2008

Transp Porous Med

View full text Add to dashboard Cite

An unsaturated flow and non-passive transport model for water-soluble organic compounds has been implemented in cylindrical coordinates, with a top boundary condition that accounts for different zones of the surface that can be under infiltration or volatilization independently. We simulated two-dimensional infiltration of aqueous mixtures of methanol from a disk source, its redistribution and volatilization in both homogeneous and heterogeneous soils. Simulations showed that the incoming composition significantly affects volumetric liquid content and concentration profiles, as well as the fraction of infiltrated mass of methanol that is released to the atmosphere. Concentration-dependent viscosity had the major impact on the liquid flow. The differences in volumetric liquid content and normalized concentration of methanol became more pronounced during transport through a soil composed of a clay lens embedded within a main matrix of sandy clay loam texture. Dispersion in the liquid-phase was the predominant transport mechanism when dispersivity at saturation was set to 7.8 cm. However, for dispersivity of 1.0 cm, changes in composition led to changes in surface tension inducing significantly higher liquid flow. In this case, liquid-phase advection was the most active transport mechanism for homogeneous soils and highly concentrated infiltrating mixtures.

show abstract

“…The soil water characteristic curve (SWCC) which reflects the storage capacity of soil (Schulze et al 1985) is an important hydraulic property of vadose zone. The SWCC is often required as input in soil water flow and contaminant migration models supporting hydrologic, environmental engineering (Henry and Smith, 2006;Ireson et al, 2009). However, direct measurement of the SWCC is time consuming, expensive, labor intensive, and subject to numerous errors.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Soil Water Characteristic Curve Using Physically Based Scaling Technique

Liu

Yasufuku

Liu

et al. 2013

LTI

View full text Add to dashboard Cite

The soil water characteristic curve (SWCC) is an important hydraulic parameter for modeling water flow and contaminant transport in the vadose zone. However, direct measurement of the SWCC is still difficult. The Arya and Paris (AP) model estimates the SWCC from particle-size distribution curve (PSD) based on the shape similarity of the two curves. They introduced an empirical parameter, α, used to scale pore attributes from hypothetical formations to natural structures. Several approaches have been used to derive α. However, the calculation procedures of these approaches are either quite complicated or are developed without paying much attention to the physical significance of the soil properties. In the present paper the physically based scaling technique (PBS) was applied to derive α for the AP model. Fifty soil samples, representing a range of textures that include sand, sandy loam, loam, silt loam, and clay, were selected from UNSODA hydraulic property database for calculating α using PBS approach. In addition, nineteen soil samples with different textures were used to verify effectiveness of proposed α values. The results compared with other approaches show that the PBS technique combine with the AP model is a more useful and easier approach to predict SWCC from PSD.

show abstract

Numerical demonstration of surfactant concentration-dependent capillarity and viscosity effects on infiltration from a constant flux line source

Cited by 15 publications

References 44 publications

Influence of surfactants on unsaturated water flow and solute transport

Influence of surfactants on unsaturated water flow and solute transport

Non-passive Transport of Volatile Organic Compounds Infiltrated from a Surface Disk Source

Prediction of Soil Water Characteristic Curve Using Physically Based Scaling Technique

Contact Info

Product

Resources

About