Experimental determination of the dew point pressure for bulk and confined gas mixtures using an isochoric apparatus

Salahshoor, Shadi; Fahes, Mashhad

doi:10.1016/j.fluid.2019.112439

Cited by 13 publications

(7 citation statements)

References 34 publications

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“…In this paper, the performed research is focused on methane adsorption, with the following formulas designed for the nanoconfined methane critical properties particularly. Salahshoor and Fahes have implemented the experimental investigation to measure the methane behavior in the nanoconfinement environment , and found that the following expression can achieve the best fits against the experimental data: T normalc T cb = 1 − 0.4 true( L − 2 σ normalf σ normalf true) − 1 / 0.96 P normalc P cb = 1 − 0.65 true( L − 2 σ normalf σ normalf true) − 1 / 2 where L denotes the nanopore size (nm) and σ f denotes the methane molecular size (0.38 nm). In combination of eqs and and eqs and , the EOS parameters for nanoconfined methane can be calculated, and then the EOS parameters for adsorption methane can be obtained.…”

Section: Model Constructionmentioning

confidence: 99%

Section: Nanoconfined Methane Critical Property Shiftmentioning

confidence: 99%

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Wettability Impact on Nanoconfined Methane Adsorption Behavior: A Simplified Local Density Investigation

Luo

Fang³

et al. 2022

Energy Fuels

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The key to unlock huge economic benefits from shale gas reservoirs is to reveal the methane adsorption behavior in nanopores. A clear understanding of nanoconfined methane adsorption behavior will dramatically mitigate the imbalance between energy supply and demand over the world, which remains a challenge and entails in-depth investigation. To the current knowledge, specific materials, like graphene layers, quartz, and feldspar, are utilized to mimic an organic or inorganic solid phase in shale, while the shale physical composition is complex and evidently cannot be represented by one or several identified compositions. In this paper, to bridge the knowledge gap, the wettability effect, embodied by the surface contact angle, is correlated to the nanoconfined methane adsorption behavior for the first time. Because the solid-phase composition variation will result in alteration of the contact angle regarding the solid−methane system, the incorporation of the surface contact angle enables this research to cover a wide range of solid composition variations. First, the relationship between solid−fluid interactions and the surface contact angle is revealed. Then, the simplified local density method is proposed by coupling the relationship upon the surface contact angle, and also the shift of methane critical properties induced by the nanoconfinement effect is considered. Results show that (a) the ratio of bulk methane to nanoconfined average density ranges from 0.55 to 0.71 with increasing pressure, (b) adsorption peak density can enhance up to 3 times by manipulating the solid-phase wettability effect, and (c) the adsorption capacity in organic-rich shale is 1.72 times that in inorganic-rich shale. The research provides a profound theoretical framework to elucidate the methane adsorption mechanism in nanopores and serves as a robust tool to reproduce and predict the methane adsorption behavior.

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Section: Model Constructionmentioning

confidence: 99%

Section: Nanoconfined Methane Critical Property Shiftmentioning

confidence: 99%

Wettability Impact on Nanoconfined Methane Adsorption Behavior: A Simplified Local Density Investigation

Luo

Fang³

et al. 2022

Energy Fuels

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“…For instance, Luo et al (2016) found a 15 K deviation in terms of hydrocarbon bubble point inside a 4.3 nm slit pore. Similarly, Salahshoor and Fahes (2020) established a high-precision laboratory experimental apparatus, directly presenting the discrepancy over the hydrocarbon phase diagram predicted using EOS equations and experimental data, confined inside pores with sizes ranging from 20 to 500 nm. At this point, alteration of methane phase behavior, when it comes to the nanoscale, is generalized knowledge, while its inherent cause remains unclear.…”

Section: Introductionmentioning

confidence: 99%

Nanoconfined Methane Thermodynamic Behavior below Critical Temperature: Liquid–Vapor Coexistence Curve under Wettability Effect

Sun

Huang

Yan

et al. 2022

Ind. Eng. Chem. Res.

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The nanoconfinement effect, induced by strong surface−molecule interactions at the nanoscale, is correlated only to the pore size from a traditional perspective. However, when the pore size is comparable to the molecular diameter, the impact of surface wettability on the surface−molecule interaction strength cannot be overlooked. In order to bridge the knowledge gap, in this article, the nanoconfinement effect is described as a function of not only pore size shrinkage but also surface wettability. The Peng− Robinson equation of state is modified by adding a fluid−surface attraction term, incorporating the shift of critical properties induced by surface affinity. Particularly, the wettability effect is described as a function of contact angle, an easily accessed macroscopic parameter, facilitating the model application. Reliability of this research is verified against shifted fluid critical properties, collected from existing reports, focusing on fluid behavior in graphite or mica nanopores. The results show that (a) reduction of methane critical temperature takes place when methane molecules are confined in hydrocarbon-wet nanopores; (b) both the enhancement of surface affinity and decline of pore size will result in the shrinkage of the methane liquid−vapor coexistence curve; and (c) the phase diagram of nanoconfined methane suggests an upward trend, attributed to the shifted critical properties. In this article, the wettability effect on nanoconfined methane behavior is revealed, expecting to enrich the theoretical background about methane behavior inside nanopores.

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“…37 Zhang et al combined the SRK-EOS model and an empirical model for adsorption thickness, generalized formulas for shift of nanoconfined fluid critical properties are raised. 38 Salahshoor and Fahes measured the dew point of nanoconfined gas mixture, 39 whereas the correlation formula proposed by Sun et 43 The wettability effect is analyzed, whereas the quantified form has not been summarized. A brief summary about the aforementioned literature on the nanoconfined critical properties shift is provided in Table 1.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al combined the SRK-EOS model and an empirical model for adsorption thickness, generalized formulas for shift of nanoconfined fluid critical properties are raised . Salahshoor and Fahes measured the dew point of nanoconfined gas mixture, whereas the correlation formula proposed by Sun et al is employed. Yang and Li modified attraction term in the original PR-EOS model, and the phase behavior of nanoconfined CO 2 /hydrocarbon system is mimicked.…”

Section: Introductionmentioning

confidence: 99%

Nanoconfined Fluid Critical Properties Variation over Surface Wettability

Xu²,

Wang³

et al. 2022

Ind. Eng. Chem. Res.

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The characterization of nanoconfined fluid critical properties is critical for nanoconfined fluid phase behavior and flow capacity evaluation. To date, fluid–surface interaction strength is considered as the original cause for the shift of fluid critical properties, which is closely related to pore size and surface wettability. However, the majority of research is devoted to investigating the impact of pore size, while investigations about surface wettability on nanoconfined fluid critical properties are lacking. In order to fill the knowledge gap, in-depth investigations have been carried out to shed light on the wettability effect on nanoconfined fluid critical properties. First, focusing on the relative strength between fluid–fluid interactions and fluid–surface interactions, a robust correlation is proposed to relate surface contact angle, a macroscopic form of wettability effect, to critical property shift. Then, a linear correlation between the wettability effect and the adsorption thickness is established, and as a result, effective pore size can be described as a function of wettability as well. Finally, a prediction model for nanoconfined fluid critical properties is developed, and its reliability is well-clarified against 86 cases, collected from previous molecular simulation results or experiments. The results show the following: (a) The magnitude of the shift of fluid critical property can reach as high as 60%, dominating the variation characteristics of nanoconfined fluid phase behavior. (b) Both the pore size shrinkage and strong fluid-affinity surface are underlying mechanisms for suppressed critical properties at nanoscale. (c) The confined effect arisen from the cylindrical geometry is 2.24 times greater than that for slit nanopores, essentially stemming from the fluid force condition exerted by the pore surface.

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Experimental determination of the dew point pressure for bulk and confined gas mixtures using an isochoric apparatus

Cited by 13 publications

References 34 publications

Wettability Impact on Nanoconfined Methane Adsorption Behavior: A Simplified Local Density Investigation

Wettability Impact on Nanoconfined Methane Adsorption Behavior: A Simplified Local Density Investigation

Nanoconfined Methane Thermodynamic Behavior below Critical Temperature: Liquid–Vapor Coexistence Curve under Wettability Effect

Nanoconfined Fluid Critical Properties Variation over Surface Wettability

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