Estimating thermo-osmotic coefficients in clay-rocks: I. Theoretical insights

Gonçalvès, Julio; Trémosa, Joachim

doi:10.1016/j.jcis.2009.09.056

Cited by 37 publications

(25 citation statements)

References 47 publications

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“…The mechanisms of water flow are considered to be due hydraulic, thermo-osmosis and 186 gravitational potentials (Gonçalvès and Trémosa 2010). It is noted that the chemical osmosis 187…”

Section: Hydraulic Behaviour 153mentioning

confidence: 99%

“…As previously mentioned, values of the ratio of thermo-osmotic conductivity and intrinsic 412 permeability against the total ionic content used in this paper are adopted from the data 413 presented by Gonçalvès and Trémosa (2010) and Gonçalvès et al (2012). This approach 414 adopted provides relationships between the thermo-osmotic conductivity and clay surface-415 charge, bulk fluid concentration, type of counter ion in the pore water and pore size.…”

Section: The Effects Of Thermo-osmosis 401mentioning

confidence: 99%

“…Due to such alteration, a positive change in enthalpy can cause a liquid flow from the 68 warm to the cold side of a sample (Gonçalvès and Trémosa 2010). Despite a significant body 69 of research studying the hydraulic behaviour of saturated and unsaturated clays, limited 70 studies have discussed the effects of thermo-osmosis on the overall thermo-hydro-mechanical 71 behaviour of saturated soils.…”

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Effects of Thermo-Osmosis on Hydraulic Behavior of Saturated Clays

2017

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17Despite a body of research carried out on thermally coupled processes in soils, understanding 18 of thermo-osmosis phenomena in clays and its effects on hydro-mechanical behaviour is 19 incomplete. This paper presents an investigation on the effects of thermo-osmosis on 20 hydraulic behaviour of saturated clays. A theoretical formulation for hydraulic behaviour is 21 developed incorporating an explicit description of thermo-osmosis effects on coupled hydro-22 mechanical behaviour. The extended formulation is implemented within a coupled numerical 23 model for thermal, hydraulic, chemical and mechanical behaviour of soils. The model is 24 tested and applied to simulate a soil heating experiment. It is shown that the inclusion of 25 thermo-osmosis in the coupled thermo-hydraulic simulation of the case study provides a 26 2 better agreement with the experimental data compared with the case where only thermal 27 expansion of the soil constituents was considered. A series of numerical simulations are also 28 presented studying the pore water pressure development in saturated clay induced by a 29 heating source. It is shown that pore water pressure evolution can be considerably affected by 30 thermo-osmosis. Under the conditions of the problem considered, it was found that thermo-31 osmosis changed the pore water pressure regime in the vicinity of the heater in the case where 32 value of thermo-osmotic conductivity was larger than 10 -12 m 2 .K -1 .s -1 . New insights into the 33 hydraulic response of the ground and the pore pressure evolution due to thermo-osmosis are 34 provided in this paper.

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“…The mechanisms of water flow are considered to be due hydraulic, thermo-osmosis and 186 gravitational potentials (Gonçalvès and Trémosa 2010). It is noted that the chemical osmosis 187…”

Section: Hydraulic Behaviour 153mentioning

confidence: 99%

Section: The Effects Of Thermo-osmosis 401mentioning

confidence: 99%

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confidence: 99%

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Effects of Thermo-Osmosis on Hydraulic Behavior of Saturated Clays

2017

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“…[18][19][20]); and the second approach refers to the continuum equations at the local scale (mechanical models) (e.g. [9,21]). Phenomenological models establish a linear proportionality between flows and driving forces, via coupling coefficients measured or assumed using the Onsager reciprocal relations [7,8].…”

Section: A Priori Simulations Of In Situ Thermo-osmotic Experimentsmentioning

confidence: 99%

“…The authors [5] provide basis for estimating thermo-osmotic conductivity for a single plane-parallel pore but a convenient expression at macroscale is missing. To overcome this difficulty the theory is formalized and upscaled in a companion paper [9].…”

Section: Introductionmentioning

confidence: 99%

Estimating thermo-osmotic coefficients in clay-rocks: II. In situ experimental approach

Trémosa

Gonçalvès

Matray

et al. 2010

Journal of Colloid and Interface Science

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Analytical Expressions for Thermo‐Osmotic Permeability of Clays

Gonçalvès

Matray

et al. 2018

Geophysical Research Letters

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In this study, a new formulation for the thermo‐osmotic permeability of natural pore solutions containing monovalent and divalent cations is proposed. The mathematical formulation proposed here is based on the theoretical framework supporting thermo‐osmosis which relies on water structure alteration in the pore space of surface‐charged materials caused by solid‐fluid electrochemical interactions. The ionic content balancing the surface charge of clay minerals causes a disruption in the hydrogen bond network when more structured water is present at the clay surface. Analytical expressions based on our heuristic model are proposed and compared to the available data for NaCl solutions. It is shown that the introduction of divalent cations reduces the thermo‐osmotic permeability by one third compared to the monovalent case. The analytical expressions provided here can be used to advantage for safety calculations in deep underground nuclear waste repositories.

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Estimating thermo-osmotic coefficients in clay-rocks: I. Theoretical insights

Cited by 37 publications

References 47 publications

Effects of Thermo-Osmosis on Hydraulic Behavior of Saturated Clays

Effects of Thermo-Osmosis on Hydraulic Behavior of Saturated Clays

Estimating thermo-osmotic coefficients in clay-rocks: II. In situ experimental approach

Analytical Expressions for Thermo‐Osmotic Permeability of Clays

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