The physical nature of thermal conduction in dry granular media

Nasirian, Ali; Cortes, Douglas D.; Dai, Sheng

doi:10.1680/geolett.14.00073

Cited by 14 publications

(4 citation statements)

References 27 publications

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“…Their combination results in an effective thermal conductivity of ~0.5 W/m/K in most dry quartzitic sands. This highlights the critical role of interparticle contact in heat transfer in particulate media [ Carslaw and Jaeger , ; Nasirian et al ., ]. By gradually adding water at grain contacts, the measured thermal conductivity in unsaturated sediments increases because of (1) improved contact quality, (2) increased contact area, and (3) increased volume fraction of water (or decreased volume fraction of air).…”

Section: Analyses and Discussionmentioning

confidence: 99%

Thermal conductivity measurements in unsaturated hydrate‐bearing sediments

Dai

Cha

Rosenbaum

et al. 2015

Geophysical Research Letters

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Current database on the thermal properties of hydrate‐bearing sediments remains limited and has not been able to capture their consequential changes during gas production where vigorous phase changes occur in this unsaturated system. This study uses the transient plane source (TPS) technique to measure the thermal conductivity of methane hydrate‐bearing sediments with various hydrate/water/gas saturations. We propose a simplified method to obtain thermal properties from single‐sided TPS signatures. Results reveal that both volume fraction and distribution of the pore constituents govern the thermal conductivity of unsaturated specimens. Thermal conductivity hysteresis is observed due to water redistribution and fabric change caused by hydrate formation and dissociation. Measured thermal conductivity increases evidently when hydrate saturation Sh > 30–40%, shifting upward from the geometric mean model prediction to a Pythagorean mixing model. These observations envisage a significant drop in sediment thermal conductivity when residual hydrate/water saturation falls below ~40%, hindering further gas production.

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Section: Analyses and Discussionmentioning

confidence: 99%

Thermal conductivity measurements in unsaturated hydrate‐bearing sediments

Dai

Cha

Rosenbaum

et al. 2015

Geophysical Research Letters

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“…The particle-level heat transfer process in porous media is preferentially conducted through minerals, followed by contact conduction between particles, and finally the adjacent particle-fluid-particle contact conduction in the fluid, as well as conduction through the pore space. Jaeger et al [47] and Nasirian et al [48] pointed out that the contact between particles plays a key role in the heat transfer of granular media. The heat transfer between particles is proportional to the particle radius [49].…”

Section: Effect Of Particle Size Of Porous Media On Heat Transfer Cha...mentioning

confidence: 99%

Review of Heat Transfer Characteristics of Natural Gas Hydrate

Mao,

Yan,

et al. 2024

Energies

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As a typical unconventional energy reservoir, natural gas hydrate is believed to be the most promising alternative for conventional resources in future energy patterns. The exploitation process of natural gas hydrate comprises a hydrate phase state, heat and mass transfer, and multi-phase seepage. Therefore, the study of heat transfer characteristics of gas hydrate is of great significance for an efficient exploitation of gas hydrate. In this paper, the research methods and research progress of gas hydrate heat transfer are reviewed from four aspects: measurement methods of heat transfer characteristics, influencing factors of heat transfer in a hydrate system and hydrate-containing porous media systems, predictive models for effective thermal conductivity, and heat transfer mechanisms of hydrate. Advanced measurement techniques and theoretical methods that can be adopted for the heat transfer characteristics of gas hydrate in the future are discussed.

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“…The majority of work in DEM thus far has been for packed bed problems supported by experimental studies ranging from loose [55,56] to dense packings [57] [58], with the aim of characterizing heat flow through the granular beds. The modeling of thermal behaviour of granular assemblies are largely dominated by circular 2D [52], or spherical 3D particle systems [35,26,36].…”

Section: Numerical Modelingmentioning

confidence: 99%