Simultaneous Transfer of Heat, Water, and Solute in Porous Media: II. Experiment and Analysis

Nassar, I. N.; Horton, Robert; Globus, A.

doi:10.2136/sssaj1992.03615995005600050005x

Cited by 51 publications

(28 citation statements)

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“…A coupled water and heat transport model based on the PDV theory adapted to include osmotic pressure effects and interfaced with a solute transport model was developed by Nassar and Horton [47]. Experimental results for non-isothermal study in 10 cm-long soil columns [48] were reasonably consistent with the general trend of calculated water content and temperature profiles, specially for experiments in which wet conditions prevailed with initial volumetric water content equal or above 0.11 m 3 /m 3 . However, for initial conditions that represented relatively dry soil conditions predictions of soil moisture content exceeded measured value significantly near the hot end of the column.…”

Section: Introductionmentioning

confidence: 67%

Non-isothermal soil water transport and evaporation

Grifoll

Gastó

Cohen

2005

Advances in Water Resources

102

100

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Section: Introductionmentioning

confidence: 67%

Non-isothermal soil water transport and evaporation

Grifoll

Gastó

Cohen

2005

Advances in Water Resources

102

100

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“…Very few detailed experimental observations of coupled transient heat and water transport in soils are available in literature; available data are scarce and incomplete, making it very difficult to test the proposed theories on coupled heat and water flow. Furthermore, most laboratory experiments use destructive sampling to determine soil water content distributions [e.g., Gurr et al , 1952; Rose , 1968; Nassar and Horton , 1989; Nassar et al , 1992; Prunty , 1992; Prunty and Horton , 1994; Bachmann et al , 2001; Prunty , 2003]. Destructive methods permit accurate gravimetric soil water content measurements but require the use of different samples at different temperatures, densities, etc., preventing the measurement of transient behavior on the same soil sample.…”

Section: Introductionmentioning

confidence: 99%

Evaporation from soils under thermal boundary conditions: Experimental and modeling investigation to compare equilibrium‐ and nonequilibrium‐based approaches

Smits,

Cihan,

Sakaki

et al. 2011

Water Resources Research

122

195

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[1] In the shallow subsurface immediately below the land-atmosphere interface, it is widely recognized that the movement of water vapor is closely coupled to thermal processes. However, their mutual interactions are rarely considered in most soil water modeling efforts or in practical applications where it becomes necessary to understand the spatial and temporal distribution of soil moisture. The validation of numerical models that are designed to capture these processes is difficult due to the scarcity of field or laboratory data with accurately known hydraulic and thermal parameters of soils, limiting the testing and refinement of heat and water transfer theories. The goal of this paper is to perform controlled experiments under transient conditions of soil moisture and temperature and use this data to test existing theories and develop appropriate numerical models. Water vapor flow under varying temperature gradients was implemented on the basis of a concept that allows nonequilibrium liquid/gas phase change with gas phase vapor diffusion. To validate this new approach, we developed a long column apparatus equipped with a network of sensors and generated data under well-controlled thermal boundary conditions at the soil surface. The nonequilibrium approach yielded good agreement with the experimental results, validating the hypothesis that transport in the gas phase is better suited to be modeled with nonequilibrium liquid/gas phase change for highly transient field conditions where the thermal conditions at the land-atmosphere interface are constantly changing.

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“…Because both of these heat coefficients were functions of moisture content, the non-linear distribution of soil temperature was probably associated with non-uniform distribution of soil moisture. Nassar and Horton (1989) and Nassar et al(1992a) presented their similar observation of non-linear shape of temperature distribution caused by changing soil water content along the column. And Nassar and Horton (1989) concluded that temperature deviations from linearity resulted from the dependence of soil thermal properties (volumetric heat capacity and thermal conductivity) upon soil water content.…”

Section: Resultsmentioning

confidence: 60%

“…Because field capacity equivalent (the water content at 1/3 bar soil-water pressure) of the soil sample in laboratory condition was 36.7%, it may be concluded that temperature gradient had little effect on soil moisture transport at equivalent field capacity. Gurr et al(1952) and Nassar et al(1992a;1996) concluded that water in dry soil moves from hot ends to cold ends mainly in the form of moisture vapor, condensing at the cold ends; driven by moisture potential gradient in the opposite direction, water moved in the liquid phase from the cold ends towards the hot ends. This bidirectional movement reached equilibrium after a certain period of time.…”

Section: Resultsmentioning

confidence: 99%

“…Following Philip and de Vries (1957) and Taylor and Cary (1964), many scientists successively made advances in research on the subject (Cassel et al, 1969;Jackson et al, 1974;Jury and Letey, 1979;Nassar and Horton, 1989;Nassar et al, 1992a;1992b). In China, some researches on coupled transfer of soil moisture and heat have also been conducted, and most of them focused on the soils in arid northern China (Yang, 1989;Zhang et al, 1990;Hu et al, 1992;Kang et al, 1993;Liu et al, 1994;Guo and Li, 1997;Ren et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

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Water and heat transport in hilly red soil of southern China: I. Experiment and analysis

Lü

Huang

Han

2005

J Zheijang Univ Sci B

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Studies on coupled transfer of soil moisture and heat have been widely carried out for decades. However, little work has been done on red soils, widespread in southern China. The simultaneous transfer of soil moisture and heat depends on soil physical properties and the climate conditions. Red soil is heavy clay and high content of free iron and aluminum oxide. The climate conditions are characterized by the clear four seasons and the serious seasonal drought. The great annual and diurnal air temperature differences result in significant fluctuation in soil temperature in top layer. The closed and evaporating columns experiments with red soil were conducted to simulate the coupled transfer of soil water and heat under the overlaying and opening fields' conditions, and to analyze the effects of soil temperature gradient on the water transfer and the effects of initial soil water contents on the transfer of soil water and heat. The closed and evaporating columns were designed similarly with about 18 °C temperatures differences between the top and bottom boundary, except of the upper end closed or exposed to the air, respectively. Results showed that in the closed column, water moved towards the cold end driven by temperature gradient, while the transported water decreased with the increasing initial soil water content until the initial soil water content reached to field capacity equivalent, when almost no changes for the soil moisture profile. In the evaporating column, the net transport of soil water was simultaneously driven by evaporation and temperature gradients, and the drier soil was more influenced by temperature gradient than by evaporation. In drier soil, it took a longer time for the temperature to reach equilibrium, because of more net amount of transported water.

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Simultaneous Transfer of Heat, Water, and Solute in Porous Media: II. Experiment and Analysis

Cited by 51 publications

References 0 publications

Non-isothermal soil water transport and evaporation

Non-isothermal soil water transport and evaporation

Evaporation from soils under thermal boundary conditions: Experimental and modeling investigation to compare equilibrium‐ and nonequilibrium‐based approaches

Water and heat transport in hilly red soil of southern China: I. Experiment and analysis

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