DC Field | Value | Language |
---|---|---|
dc.contributor.author | Park, Taehyung | ko |
dc.contributor.author | Lee, Joo Yong | ko |
dc.contributor.author | Kwon, Tae-Hyuk | ko |
dc.date.accessioned | 2018-05-24T02:23:57Z | - |
dc.date.available | 2018-05-24T02:23:57Z | - |
dc.date.created | 2018-05-14 | - |
dc.date.created | 2018-05-14 | - |
dc.date.created | 2018-05-14 | - |
dc.date.issued | 2018-04 | - |
dc.identifier.citation | ENERGY & FUELS, v.32, no.4, pp.5321 - 5330 | - |
dc.identifier.issn | 0887-0624 | - |
dc.identifier.uri | http://hdl.handle.net/10203/242246 | - |
dc.description.abstract | Capillarity in small, confined pores has a pronounced effect on the depression of the dissociation temperature of gas hydrates, known as the Gibbs-Thomson effect. However, this effect remains poorly understood in natural fine-grained sediments with wide pore size distributions. This study investigated the effect of pore size distributions of fine-grained sediments on the dissociation temperature of a gas hydrate. A gas hydrate was synthesized under partially water-saturated conditions in nanosized silica gels and in various natural fine-grained sediment samples, including sand, silt, diatoms, a diatom-sand mixture, and clayey sediment. The synthesized hydrate samples were thermally dissociated under isochoric conditions, while the melting temperature depression and the shifted phase boundaries were monitored. We observed a dissociation temperature depression of approximately 0.1-0.3 degrees C in silt, 0.2-0.4 degrees C in the diatom sample, and 1.2-1.5 degrees C in clayey silt, while no temperature depression was observed in sand. In a particular case of diatom-sand mixture, the dual porosity condition with the submicron-scale internal pores of diatoms and the macropores of sands rendered dual phase boundaries, one with an similar to 0.4 degrees C temperature depression and one with no depression, respectively. Despite the wide ranges of pore size, gas hydrates were preferentially formed in smaller pores, which comprise less than 40% of the cumulative pore volumes. This was because the initial water loci exacerbated the Gibbs-Thomson effect in partially water-saturated conditions. Our results provide clear experimental evidence on and novel insights into the effect of pore size distributions of fine-grained sediments on the dissociation behavior and phase boundaries of gas hydrates, both in the presence of free gas and in water-limiting conditions that exhibit a considerable Gibbs-Thomson effect. | - |
dc.language | English | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.title | Effect of Pore Size Distribution on Dissociation Temperature Depression and Phase Boundary Shift of Gas Hydrate in Various Fine-Grained Sediments | - |
dc.type | Article | - |
dc.identifier.wosid | 000430783300130 | - |
dc.identifier.scopusid | 2-s2.0-85045914478 | - |
dc.type.rims | ART | - |
dc.citation.volume | 32 | - |
dc.citation.issue | 4 | - |
dc.citation.beginningpage | 5321 | - |
dc.citation.endingpage | 5330 | - |
dc.citation.publicationname | ENERGY & FUELS | - |
dc.identifier.doi | 10.1021/acs.energyfuels.8b00074 | - |
dc.contributor.localauthor | Kwon, Tae-Hyuk | - |
dc.contributor.nonIdAuthor | Lee, Joo Yong | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | METHANE HYDRATE | - |
dc.subject.keywordPlus | CARBON-DIOXIDE | - |
dc.subject.keywordPlus | STABILITY ZONE | - |
dc.subject.keywordPlus | CO2 HYDRATE | - |
dc.subject.keywordPlus | MARINE-SEDIMENTS | - |
dc.subject.keywordPlus | HEAT-TRANSFER | - |
dc.subject.keywordPlus | POROUS-MEDIA | - |
dc.subject.keywordPlus | FLUID-FLOW | - |
dc.subject.keywordPlus | WATER | - |
dc.subject.keywordPlus | EQUILIBRIUM | - |
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