The Thermal Conductivity Of Rocks And Its Dependence On Temperature And Composition Pdf

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Historical Version s - view previous versions of standard. More D It generally characterizes the rate at which a heat pulse will diffuse through a solid material.

What is Thermal Conductivity?

Rock , in geology , naturally occurring and coherent aggregate of one or more minerals. Such aggregates constitute the basic unit of which the solid Earth is composed and typically form recognizable and mappable volumes. Rocks are commonly divided into three major classes according to the processes that resulted in their formation. These classes are 1 igneous rocks, which have solidified from molten material called magma; 2 sedimentary rocks, those consisting of fragments derived from preexisting rocks or of materials precipitated from solutions; and 3 metamorphic rocks, which have been derived from either igneous or sedimentary rocks under conditions that caused changes in mineralogical composition , texture, and internal structure. These three classes, in turn, are subdivided into numerous groups and types on the basis of various factors, the most important of which are chemical, mineralogical, and textural attributes.

Hans-Peter Gail 1 and Mario Trieloff 2 ,3. Trieloff geow. Received: 13 December Accepted: 28 March Understanding the compaction and differentiation of the planetesimals that formed during the initial phases of our solar system and the protoplanets from the asteroid belt and the terrestrial planet region of the solar system requires a reliable modelling of their internal thermal evolution. An important ingredient for this is a detailed knowledge of the heat conductivity, K , of the chondritic mixture of materials from which planetesimals are formed.

The present work aims to study the nonlinear effective thermal conductivity of heterogeneous composite-like geomaterials by using a numerical approach based on the immersed interface method IIM. This method is particularly efficient at solving the diffusion problem in domains containing inner boundaries in the form of perfect or imperfect interfaces between constituents. In this paper, this numerical procedure is extended in the framework of non linear behavior of constituents and interfaces. The performance of the developed tool is then demonstrated through the studies of temperature- and pressure-dependent effective thermal conductivity of geomaterials with imperfect interfaces. The estimation of the effective transfer properties of heterogeneous media such as geomaterials is still nowadays a challenging research field despite perpetual advances of research and an increasing number of published works.

Microwave propagation and absorption and its thermo-mechanical consequences in heterogeneous rocks

Measurements on thermal conductivity and diffusivity as functions of temperature up to K and pressure up to MPa are presented for Archaean and Proterozoic mafic high-grade rocks metamorphosed in middle and lower crustal pressures, and situated in eastern Finland, central Fennoscandian Shield. Radiative heat transfer effects were not detected in these samples. Pressure dependencies of the samples are weak if compared to crystalline rocks in general, but relatively typical for mafic rocks. The temperature and pressure dependencies of thermal transport properties data from literature and the present study were applied in an uncertainty analysis of lithospheric conductive thermal modellings with random Monte Carlo simulations using a 4-layer model representative of shield lithosphere. Model parameters were varied according to predetermined probability functions and standard deviations were calculated for lithospheric temperature and heat flow density after independent simulations. The results suggest that the variations uncertainties in calculated temperature and heat flow density values due to variations in the temperature and pressure dependencies of conductivity are minor in comparison to the effects produced by typical variations in the room temperature value of conductivity, heat production rate or lower boundary condition values. This is a preview of subscription content, access via your institution.


The thermal conductivity of rocks and its dependence upon temperature and composition; Part II The first page of the PDF of this article appears above.


What is Thermal Conductivity?

The development of numerical models capable of predicting the geothermal behaviour of the reservoir after a certain number of years of use can be useful and applicable to this and other sedimentary mining basins. A procedure for predicting in situ thermal conductivity k profiles using lithological and mineralogical information for modelling purposes was applied to a mining reservoir in the CCB. First, all the involved geological units were sampled in unaltered outcrops, assuming that weathering have not significantly biased thermal properties. 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.

Microwave propagation and absorption and its thermo-mechanical consequences in heterogeneous rocks

Thermal Conductivity and Temperature

Rock , in geology , naturally occurring and coherent aggregate of one or more minerals. Such aggregates constitute the basic unit of which the solid Earth is composed and typically form recognizable and mappable volumes. Rocks are commonly divided into three major classes according to the processes that resulted in their formation. These classes are 1 igneous rocks, which have solidified from molten material called magma; 2 sedimentary rocks, those consisting of fragments derived from preexisting rocks or of materials precipitated from solutions; and 3 metamorphic rocks, which have been derived from either igneous or sedimentary rocks under conditions that caused changes in mineralogical composition , texture, and internal structure. These three classes, in turn, are subdivided into numerous groups and types on the basis of various factors, the most important of which are chemical, mineralogical, and textural attributes. Igneous rocks are those that solidify from magma , a molten mixture of rock-forming minerals and usually volatiles such as gases and steam. Since their constituent minerals are crystallized from molten material, igneous rocks are formed at high temperatures.

Jesse D. Merriman, Anne M. Hofmeister, Derick J. Roy, Alan G. Whittington; Temperature-dependent thermal transport properties of carbonate minerals and rocks. Geosphere ;; 14 4 : — For different minerals, D was governed by density or unit cell size.

In heat transfer , the thermal conductivity of a substance, k , is an intensive property that indicates its ability to conduct heat. Thermal conductivity is often measured with laser flash analysis. Alternative measurements are also established. Mixtures may have variable thermal conductivities due to composition.

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2 Response
  1. Dominic T.

    The thermal conductivity of rocks and its dependence upon temperature and composition The first page of the PDF of this article appears above. Previous​Next.

  2. Danny M.

    A numerical analysis in a two-component model rock is presented including the propagation and absorption of a microwave beam as well as the microwave-induced temperature and stress distributions in a consistent way.

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