Non-equilibrium in multiphase multicomponent flow in porous media: An evaporation example

Nuske, P.; Niasar, Vahid; Helmig, Rainer

doi:10.1016/j.ijheatmasstransfer.2014.03.011

Cited by 28 publications

(32 citation statements)

References 42 publications

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“…For example, the assumption of local thermodynamic equilibrium for phase transition and energy transfer has been questioned and analyzed, e.g., in Trautz et al (2015), Nuske et al (2014) and Smits et al (2011). , Shahraeeni and Or (2010) and Assouline et al (2010) investigated how the development of wet soil pore patches together with the environmental conditions affects evaporation behavior.…”

Section: Introductionmentioning

confidence: 99%

Effect of Turbulence and Roughness on Coupled Porous-Medium/Free-Flow Exchange Processes

2016

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The interactions between turbulent free flow and flow in a porous medium are of key interest in different fields, e.g., meteorology, agriculture, building physics, and aerospace engineering. Properly understanding the strongly coupled exchange processes between the two domains is crucial to describing these interactions. In (Mosthaf et al. in Water Resour Res 47(10):W10522, 2011. doi:10.1029/2011WR010685), a concept for coupling laminar compositional single-phase free flow to compositional two-phase porous-medium flow under non-isothermal conditions was presented. In this study, the existing coupling concept is first extended to turbulent free-flow conditions. This includes the interface conditions between a Reynolds-averaged Navier-Stokes free flow using algebraic turbulence models and a Darcy porous-medium flow. Second, eddy viscosity and boundary layer models for a rough interface are integrated into this model concept. Results from laboratory evaporation experiments are used for comparison of the developed model concept. A sensitivity analysis of the evaporation rate and porous-medium quantities on different model setups, boundary conditions, BeaversJoseph coefficients, and roughness lengths is performed. Results demonstrate how including turbulence, either with eddy viscosity or boundary layer models, affects the evaporation rate. The model concept is able to predict early stage-I and intermediate to later stage-II evaporation rates. Sand-grain roughness concepts are successfully included into the model and show the desired qualitative effect.

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Section: Introductionmentioning

confidence: 99%

Effect of Turbulence and Roughness on Coupled Porous-Medium/Free-Flow Exchange Processes

2016

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“…[9]]. In this work, we provide tools and conceptual as well as numerical models which allow us to describe and study two-phase flow in porous media without making local thermal equilibrium assumptions: We build on the concepts explained in Nuske et al [17] and apply the macro-scale model developed in that work. In this work, we focus on the transfer of micro-scale measurements to macro-scale properties and application of those quantities in macro-scale models.…”

Section: Introductionmentioning

confidence: 99%

“…The macro-scale balance equations used in this work build on Ahrenholz et al [2], extended in Nuske et al [17]. In that work, local chemical and thermal non-equilibrium are allowed between the fluid phases and the solid and fluid phases respectively.…”

Section: Introductionmentioning

confidence: 99%

“…A parameter study was conducted and it was found that variations in f e lead to the expected and physically reasonable results. In this work, the macro-scale balance equations explained in Nuske et al [17] are employed in order to simulate the experiment described in Karadimitriou et al [11].…”

Section: Introductionmentioning

confidence: 99%

“…In order to accomplish this, we simulate two experimental runs of the experiment explained in Karadimitriou et al [11] with the macro-scale local thermal non-equilibrium model explained in Nuske et al [17] and given for completeness in Appendices A and B. By comparing simulation and experiment, we obtain a first-order approximation of the up-to-now unknown scaling parameter f e which was suggested in Nuske et al [17]. However, it has to be clearly stated that the goal of this work is not the exact reproduction of all presented aspects of the experimental observations.…”

Section: Introductionmentioning

confidence: 99%

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Modeling two-phase flow in a micro-model with local thermal non-equilibrium on the Darcy scale

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Heat and water transport in soils and across the soil‐atmosphere interface: 1. Theory and different model concepts

Vanderborght

Fetzer

Mosthaf

et al. 2017

Water Resources Research

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Evaporation is an important component of the soil water balance. It is composed of water flow and transport processes in a porous medium that are coupled with heat fluxes and free air flow. This work provides a comprehensive review of model concepts used in different research fields to describe evaporation. Concepts range from nonisothermal two‐phase flow, two‐component transport in the porous medium that is coupled with one‐phase flow, two‐component transport in the free air flow to isothermal liquid water flow in the porous medium with upper boundary conditions defined by a potential evaporation flux when available energy and transfer to the free airflow are limiting or by a critical threshold water pressure when soil water availability is limiting. The latter approach corresponds with the classical Richards equation with mixed boundary conditions. We compare the different approaches on a theoretical level by identifying the underlying simplifications that are made for the different compartments of the system: porous medium, free flow and their interface, and by discussing how processes not explicitly considered are parameterized. Simplifications can be grouped into three sets depending on whether lateral variations in vertical fluxes are considered, whether flow and transport in the air phase in the porous medium are considered, and depending on how the interaction at the interface between the free flow and the porous medium is represented. The consequences of the simplifications are illustrated by numerical simulations in an accompanying paper.

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Non-equilibrium in multiphase multicomponent flow in porous media: An evaporation example

Cited by 28 publications

References 42 publications

Effect of Turbulence and Roughness on Coupled Porous-Medium/Free-Flow Exchange Processes

Effect of Turbulence and Roughness on Coupled Porous-Medium/Free-Flow Exchange Processes

Modeling two-phase flow in a micro-model with local thermal non-equilibrium on the Darcy scale

Heat and water transport in soils and across the soil‐atmosphere interface: 1. Theory and different model concepts

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