Last edited by Kazrajora
Tuesday, July 21, 2020 | History

2 edition of In situ measurement of thermal conductivities of rocks. found in the catalog.

In situ measurement of thermal conductivities of rocks.

James Arthur Wright

In situ measurement of thermal conductivities of rocks.

by James Arthur Wright

  • 248 Want to read
  • 25 Currently reading

Published .
Written in English

    Subjects:
  • Heat -- Conduction,
  • Earth temperature,
  • Thermistors,
  • Physics Theses

  • Edition Notes

    ContributionsGarland, G. D. (supervisor)
    Classifications
    LC ClassificationsLE3 T525 MA 1965 W75
    The Physical Object
    Pagination1 v. (various pagings)
    ID Numbers
    Open LibraryOL14746279M

    erties of reservoir rocks made in the laboratory or in situ. As a result, engineers often calculate these thermal properties by using crude predic-tive models, without reference to actual mea-surements on core samples. This lack of thermal measurements represents a big gap in current knowledge of reservoir rock properties. One reason for the. Predicting thermal conductivities of formations from other known properties, Analysis of heat flow data—In situ thermal conductivity measurements, The estimation of rock thermal conductivity from mineral content—An assessment of techniques.

      The new method was then used to re-interpret thermal conductivity data involving wettable and non-wettable soils, in situ field measurements, and snow. Key words: thermal conductivity, soil, quartz, ice, water, air, density, snow. Herein, we report the first measurement of the specific heat of multilayer and monolayer graphene in both supported and suspended geometries. Their thermal conductivities were also simultaneously measured using a comprehensive Raman optothermal method without needing to .

    On the in situ measurement of the thermal conductivity of deep-sea sediments, The use of complete temperature-time curves for determination of thermal conductivity, with particular reference to rocks. The thermal conductivities of ocean sediments. J. geophys. Res. Relative to rocks and soils the conductivities are very high. The following are typical values for some select metals: Metals Resistivity [Ohm-m] Aluminum x Copper x Iron 10 x Mercury 95 x Silver x Steel x


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In situ measurement of thermal conductivities of rocks by James Arthur Wright Download PDF EPUB FB2

Actual shale thermal conductivities appear to be 25 to 50% lower than the literature values and do not appear to vary as a function of compaction in the expected way.

Thus, some sort of in situ technique of thermal conductivity determination is by: The solid‐rock conductivity is deduced from a divided‐bar measurement of the conductivity of a cylindrical cell containing water‐saturated rock fragments. All determinations fall within about ten per cent of conventionally measured solid‐rock values for a variety of crystalline and sedimentary rocks with conductivities ranging from Cited by: In the framework of the Mallik program, only a very limited number of direct measurements of thermal conductivity on hydrate‐bearing rock samples was carried out [Wright et al., ].

Therefore, within this study the in situ thermal conductivity was estimated from petrophysical models as well as from the measured geothermal by: The obtained thermal conductivities of sedimentary rocks have been cross-validated with results of measurements of rock samples with similar lithology (Čermak & Rybach ;Clauser ) and the.

@article{osti_, title = {Estimation of in-situ thermal conductivities from temperature gradient measurements}, author = {Hoang, V. T.}, abstractNote = {A mathematical model has been developed to study the effect of variable thermal conductivity of the formations, and the wellbore characteristics, on the fluid temperature behavior inside the wellbore during injection or production and.

Based on the detailed drillers logs for each borehole, the estimated thermal conductivity of the site was in the range to W/m, K. However, when the in-situ test was carried out, the thermal conductivity value for the site was found to be in the range to W/m, K. Temperature effect on thermal conductivity of mafic rocks 34 Temperature effect on thermal conductivity of felsic igneous rocks 35 Temperature effect on thermal conductivity carbonate rocks 36 Temperature effect on thermal conductivity sandstones, quartzites, and shales 38   What is in-situ stress in rocks.

In-situ stresses are the stresses which developed due to weight of the overlying materials and also due to the confinement and the past stress history at a point below the rock surface of the undisturbed rock mass.

These stresses may vary considerably from one point to other. At some [ ]. Rock - Rock - Thermal properties: Heat flow (or flux), q, in the Earth’s crust or in rock as a building material, is the product of the temperature gradient (change in temperature per unit distance) and the material’s thermal conductivity (k, the heat flow across a surface per unit area per unit time when a temperature difference exists in unit length perpendicular to the surface).

In cancer/oncology: in situ means that malignant cells are present as a tumor but have not metastasized, or invaded beyond the layer or tissue type where it arose. This can happen anywhere in the body, such as the skin, breast tissue, or lung. For example, a cancer of epithelial origin with such features is called carcinoma in situ, and is defined as not having invaded beyond the basement.

The temperature measurements at the heat source make the diffusivity estimations very inaccurate. Thus, additional measurements of rock heat capacity and density, i.e.

volumetric heat capacity, values are needed for improved parameter estimation in thermal modelling of a repository. The various common rock forming minerals have different thermal conductivities.

Igneous rocks consist of varying proportions of a limited number of common minerals. Knowing the thermal conductivity of the constituent minerals, one can estimate the thermal conductivity for any rock with known mineral composition.

The parallel‐wire technique can be used for thermal conductivities below 20 W/m K. The cross‐wire technique can be used to measure thermal conductivities below 2 W/m K. Another use of the method is a steady‐state pipe method having a cylindrical specimen geometry and containing radial heat‐flow measurements [7, 21, 22].

This technique. In Situ Measurement of Ground Thermal Conductivity: The Dutch Perspective Abstract Determination of the ground’s thermal conductivity is a significant challenge facing designers of Ground Source Heat Pump (GSHP) systems applied in commercial buildings.

The ground heat exchanger size and cost are highly dependent on the ground thermal properties. is used to determine the thermal capacity of underground ther-mal energy storage systems based on thermal response tests of underground storage volumes.

Gehlin and Nordell () report on results from in-situ thermal response tests conducted using the mobile testing facility at various locations in Sweden to predict ground thermal conductivities.

Prediction of thermal conductivity of granite rocks from porosity and density data at normal temperature and pressure: in situ thermal conductivity measurements. Asghari Maqsood 1, Kashif Kamran 1 and Iftikhar Hussain Gul 1. Published 2 December • IOP Publishing Ltd Journal of Physics D: Applied Physics, Vol Number Purchase Thermal Properties and Temperature-Related Behavior of Rock/Fluid Systems, Volume 37 - 1st Edition.

Print Book & E-Book. ISBNActually, in situ measurements of the interior heat flux and the thermal conductivity of the near surface layer have only been performed for the Moon in the frame of two Apollo missions (Apollo 15 and Apollo 17) in the years and They carried a surface science package named ALSEP, which included a thermal conductivity and heat flow.

Rock particles typically have thermal conductivities between 2 and W/mK compared to air which is W/mK. When the air was replaced with water the thermal conductivity of the rock significantly increased due to the higher thermal conductivity of the water ( W/mK) allowing greater heat flow.

A KD 2-Pro was used for the in situ measurement of thermal properties. The average soil thermal conductivities for the pipeline route between two stations ranges from to W/(m°C) in. The matrix thermal conductivity of each sample was estimated from the thermal conductivities of the respective mineralogical components, whose proportion were determined by optical microscopy.

A final k was acquired considering the effects of porosity, temperature and mineralogical composition of the rock matrix and assuming water as the pore.Thermal conductivity and diffusivity of rocks are primarily controlled by the mineral composition, texture, porosity, and pore filling fluids.

The most typical rock forming minerals have thermal conductivities in the range of to W m-1 K-1, but typically. The thermo-physical properties for four rock types (granite, granodiorite, gabbro, and garnet amphibolite) from room temperature to 1, K were investigated.

Thermal diffusivity and specific heat capacity were measured using the laser-flash technique and heat flux differential scanning calorimetry, respectively.

Combined with the density data, rock thermal conductivities were calculated.