Thermal Conductivity of Unconsolidated Marine Sediments from Vøring Basin, Norwegian Sea

Midttømme, Kirsti; Sættem, Joar; Roaldset, E.; Zielinski, Gary W.

doi:10.3997/2214-4609.201409594

Cited by 5 publications

(9 citation statements)

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“…The thermal conductivities of the ''uncemented'' sample, after the salt bonds had been broken, match those of glass beads with a particle size of 70-75 mm (Figure 2b). These results are consistent with previous studies that indicate that the larger particle size fractions tend to control the thermal conductivity [Presley and Craddock, 2006; see also Midttømme et al, 1997]. For these two samples, however, as much as 9% of the ''cemented'' sample is larger than 1000 mm, and at least 13% of the ''uncemented'' sample is larger than 75 mm.…”

Section: Discussionsupporting

confidence: 92%

The effect of salt crust on the thermal conductivity of one sample of fluvial particulate materials under Martian atmospheric pressures

2009

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[1] A line-heat source apparatus was used to measure thermal conductivities of a lightly cemented fluvial sediment (salinity = 1.1 g Á kg À1 ), and the same sample with the cement bonds almost completely disrupted, under low pressure, carbon dioxide atmospheres. The thermal conductivities of the cemented sample were approximately 3Â higher, over the range of atmospheric pressures tested, than the thermal conductivities of the same sample after the cement bonds were broken. A thermal conductivity-derived particle size was determined for each sample by comparing these thermal conductivity measurements to previous data that demonstrated the dependence of thermal conductivity on particle size. Actual particle-size distributions were determined via physical separation through brass sieves. When uncemented, 87% of the particles were less than 125 mm in diameter, with 60% of the sample being less than 63 mm in diameter. As much as 35% of the cemented sample was composed of conglomerate particles with diameters greater than 500 mm. The thermal conductivities of the cemented sample were most similar to those of 500-mm glass beads, whereas the thermal conductivities of the uncemented sample were most similar to those of 75-mm glass beads. This study demonstrates that even a small amount of salt cement can significantly increase the thermal conductivity of particulate materials, as predicted by thermal modeling estimates by previous investigators.

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Section: Discussionsupporting

confidence: 92%

The effect of salt crust on the thermal conductivity of one sample of fluvial particulate materials under Martian atmospheric pressures

2009

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“…Comparative measurements between the two methods have been reported previously and agreement was obtained by Von Herzen & Maxwell (1959), Sass et al (1971) and Brigaud & Vasseur (1989). Higher values of thermal conductivity were measured with the needle probe by Slusarchuk & Foulger (1973), Johansen (in Farouki, 1981), Somerton (1992) and Midttomme et al (1997b).…”

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confidence: 74%

Thermal conductivity of selected claystones and mudstones from England

1998

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The claystones and mudstones investigated are London Clay, Fullers Earth, Oxford Clay and Kimmeridge Clay. The thermal conductivities were measured using a divided bar apparatus and the values measured perpendicular to layering ranged from 0.68 to 0.97 W/mK. Comparative measurements of thermal conductivities were carried out by the needle probe method and Middleton's method. Deviations of up to 50% were obtained between the needle probe and the divided bar method. The thermal conductivities estimated from the geometric mean model based on mineralogy and water content ranged from 0.87 to 2.01 W/mK, considerably higher than the measured values. A correlation was found between the grain size distributions of the samples and the measured thermal conductivities. This textural effect on the thermal conductivity is assumed to be the main reason for the low measured values and the lack of correlation between the measured and the calculated values.

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“…Some selected and widely used theoretical models for the ETC of porous materials as a function of temperature, porosity, and thermal conductivity of solid matrix and pore fluid are presented in Tables 1 and 2. An extensive review of literature on ETC models for porous materials is performed by [57,62,75,80,84,[89][90][91][92].…”

Section: Article In Pressmentioning

confidence: 99%