The Thermal Conductivity of Two Clathrate Hydrates

Cook, John G.; Laubitz, M. J.

doi:10.1007/978-1-4899-5436-7_68

Cited by 13 publications

(15 citation statements)

References 6 publications

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“…In addition, when the cavity occupancy ratio at a pressure of 3 MPa was increased from 0.375 to 0.75, λ increased from 0.5113 to 0.5838 W m 1 K 1 in agreement with the experimental value, 0.49-0.56 W m 1 K 1 [1][2][3]. Thus, we may reasonably conclude that the cavity occupancy ratios in the samples studied in refs.…”

Section: Effects Of the Guest Moleculessupporting

confidence: 84%

“…The value reported in ref. [3] is higher than the values reported in the earlier literature [1,2] as a result of the higher cavity occupancy ratio produced in the hydrate formed from sodium dodecyl sulfate solution. The highest value of the thermal conductivity, reported in ref.…”

Section: Introductioncontrasting

confidence: 61%

“…It has been found that thermal conductivity of methane hydrate is approximately one-fifth of the value for ice, although there are some discrepancies between the results of different studies. Cook and Laubitz [1] measured the thermal conductivity of methane hydrate using the steady-state plane source technique and obtained a value of 0.49 W m 1 K 1 at 263.15 K. Waite et al [2] investigated the thermal conductivity of methane hydrate from 243.15 to 268.15 K employing the same method. Their reported value was approximately 0.47 W m 1 K 1 .…”

Section: Introductionmentioning

confidence: 99%

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Molecular dynamics simulations of the mechanisms of thermal conduction in methane hydrates

Wan

Liang

et al. 2012

Sci. China Chem.

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The thermal conductivity of methane hydrate is an important physical parameter affecting the processes of methane hydrate exploration, mining, gas hydrate storage and transportation as well as other applications. Equilibrium molecular dynamics simulations and the Green-Kubo method have been employed for systems from fully occupied to vacant occupied sI methane hydrate in order to estimate their thermal conductivity. The estimations were carried out at temperatures from 203.15 to 263.15 K and at pressures from 3 to 100 MPa. Potential models selected for water were TIP4P, TIP4P-Ew, TIP4P/2005, TIP4P-FQ and TIP4P/Ice. The effects of varying the ratio of the host and guest molecules and the external thermobaric conditions on the thermal conductivity of methane hydrate were studied. The results indicated that the thermal conductivity of methane hydrate is essentially determined by the cage framework which constitutes the hydrate lattice and the cage framework has only slightly higher thermal conductivity in the presence of the guest molecules. Inclusion of more guest molecules in the cage improves the thermal conductivity of methane hydrate. It is also revealed that the thermal conductivity of the sI hydrate shows a similar variation with temperature. Pressure also has an effect on the thermal conductivity, particularly at higher pressures. As the pressure increases, slightly higher thermal conductivities result. Changes in density have little impact on the thermal conductivity of methane hydrate.

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Section: Effects Of the Guest Moleculessupporting

confidence: 84%

Section: Introductioncontrasting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

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Molecular dynamics simulations of the mechanisms of thermal conduction in methane hydrates

Wan

Liang

et al. 2012

Sci. China Chem.

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“…Thermal conductivity of clay at 0% moisture content is reported to be about 0.25 W/m·k [16,17]. This is similar to what was obtained for TMC thus confirming that it is a good insulator which can inhibit heat transfer into stored grains, a very important factor in postharvest grain management.…”

Section: Thermal Conductivitysupporting

confidence: 69%

An Investigation into the Thermal Properties of Termite Mound Clay Applicable to Grain Silo Construction

Oluyimika

Yahaya²

2015

IJMSA

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Abstract:Provision of suitable grain silos in humid tropical climates has generated research interests on the possibility of using local materials for construction. Termite mound clay (TMC), a material available in abundance was investigated as a potential construction material. A major factor determining the suitability of construction materials for grain silos is its thermal properties. Therefore, thermal conductivity, specific heat capacity, thermal diffusivity and thermal mass of TMC were determined and compared with those of concrete and stainless steel which are commonly used for silo construction. TMC was collected, crushed and sieved using a 500µm sieve to remove coarse particles and foreign materials. The TMC powder obtained was mixed with water using volumetric ratio of 1:5 (i.e. water to clay) after which the thoroughly mixed clay was carefully fed into the mould and left to air-dry for 5 days. The samples were dried in the oven at 105 o C for about 48 hours to remove all the moisture. Results revealed that thermal conductivity ranged from 0.17 to 0.24 W/(m·K) with an average value of 0.21 compared to concrete and steel which range between 0.8 -1.28 and 16.3 -16.7 W/(m·K) respectively. Specific heat capacity had an average value of 2576.94 J/(kg·K) compared with concrete and steel which had values of 960 and 490 J/(kg·K) respectively. Thermal diffusivity had a mean value of 1.47×10 -8 m 2 /s in comparison to concrete and steel whose calculated values were 6.63 ×10 -7 and 4.18 ×10 -6 kJ/(m 3 ·K) respectively while thermal mass had a mean value of 4723.5 kJ/(m 3 ·K) compared to 2112.0 and 3831.8 kJ/(m 3 ·K) for concrete and steel respectively. It was concluded that TMC offers a thermally suitable alternative to these two for grain silo construction in the humid tropics.

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“…There are limited data on the conductivity of clathrates at low temperatures. Their thermal conductivity has been measured on gas hydrates of structure I as CH 4 (Krivchikov et al 2005a), Xe (Handa & Cook 1987;Krivchikov et al 2006) and ethylene oxide (Cook & Laubitz 1983), and gas hydrates of structure II as tetrahydrofuran (Ross & Andersson 1982;Tse & White 1988;Andersson & Suga 1996;Krivchikov et al 2005b), dioxolane (Andersson & Ross 1983;Ahmad & Phillips 1987) and cyclobutanone (Andersson & Ross 1983) in a wide range of temperatures. It is very challenging to measure the bulk thermal conductivity of a homogeneous continuous solid (Krivchikov et al 2007).…”

Section: Thermal Conductivity Of Clathratesmentioning

confidence: 99%

A cometary nucleus model taking into account all phase changes of water ice: amorphous, crystalline, and clathrate

Marboeuf

Schmitt

Petit

et al. 2012

A&A

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Context. Current theories, models of cometary nuclei and of ice formation in the protoplanetary disk, and laboratory studies suggest that cometary materials could be formed of pure crystalline water ice, amorphous water ice, clathrate hydrate, or a mixture of these structures of water ice. However, current models of cometary nuclei consider only two forms of ice during the thermodynamic evolution of comets: amorphous and crystalline water ices. Aims. In this work, we have developed a model of cometary nucleus that takes into account all water ice structures and phase changes in order to predict the outgassing profile of volatile molecules that could be measured by the Rosetta mission and can be used to constrain the structural type of ice existing in the interior of the Comet 67P/Churyumov-Gerasimenko, the target comet of the Rosetta mission, and, hopefully, its initial composition. Methods. We added the physic of formation/dissociation of clathrate hydrates in addition to others physical processes that are taken into account in models without clathrate hydrates. All thermal changes, as well as the release and trapping of gas with water phase changes are taken into account. Results. This model describes heat transmission, latent heat exchanges, all water ices structures and transitions (amorphous-to-pure crystalline, amorphous-to-clathrate hydrates and pure crystalline-to-clathrate hydrates and vise versa), sublimation/recondensation of volatile molecules in the nucleus, gas diffusion, gas released and trapped by crystallization and clathrate formation/dissociation processes, as well as gas and dust release and mantle formation at the surface. Applying this model to the comet 67P/ChuryumovGerasimenko, results show different outgassing profiles of volatiles molecules from the nucleus depending on the water ice structure, the distribution of volatile molecules between the "trapped" and "condensed" states in the nucleus and the thermal inertia of its porous matrix. Conclusions. Given these results, we pretend that this model is able to constrain the water ice structure and chemical composition in comets from outgassing profiles of volatile molecules, and especially those of the target comet of the Rosetta mission.

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The Thermal Conductivity of Two Clathrate Hydrates

Cited by 13 publications

References 6 publications

Molecular dynamics simulations of the mechanisms of thermal conduction in methane hydrates

Molecular dynamics simulations of the mechanisms of thermal conduction in methane hydrates

An Investigation into the Thermal Properties of Termite Mound Clay Applicable to Grain Silo Construction

A cometary nucleus model taking into account all phase changes of water ice: amorphous, crystalline, and clathrate

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