A methodology for determining thermal properties of rocks

Krishnaiah, S.; Singh, Devendrá; Jadhav, G.N.

doi:10.1016/j.ijrmms.2004.02.004

Cited by 36 publications

(21 citation statements)

References 29 publications

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“…It can be noted that with increase in porosity, thermal resistivity increases (R = 0.9). Incidentally, variation of thermal resistivity with respect to porosity was noticed to be consistent with the trends reported in previous works [ 5,23,40,41]. Also the relationship between porosity and thermal diffusivity agrees with [40].…”

Section: Degree Of Saturationsupporting

confidence: 90%

In Situ Determination of Thermal Resistivity of Soil: Case Study of Olorunsogo Power Plant, Southwestern Nigeria

Oladunjoye

Sanuade

2012

ISRN Civil Engineering

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This study measured in situ the thermal resistivity of soils at Olorunsogo Gas Turbine Power Station (335 MW Phase 1) which is located in Ogun State, Southwestern Nigeria. Ten pits, each of about 1.5 m below the ground surface, were established in and around the power plant in order to measure the thermal resistivity of soils in situ. A KD 2-Pro was used for the in situ measurement of thermal properties. Samples were also collected from the ten pits for laboratory determination of the physical parameters that influence thermal resistivity. The samples were subjected to grain size distribution analysis, compaction, specific gravity and porosity tests, moisture content determination, and XRD analysis. Also, thermal resistivity values were calculated by an algorithm using grain size distribution, dry density, and moisture content for comparison with the in situ values. The results show that thermal resistivity values range from 34.07 to 71.88 • C-cm/W with an average of 56.43 • C-cm/W which falls below the permissible value of 90 • C-cm/W for geomaterials. Also, the physical parameters such as moisture content, porosity, degree of saturation, and dry density vary from 13.00 to 16.20%, 39.74 to 45.64%, 40.72 to 63.52%, and 1725.05 to 1930.00 Kg/m 3 , respectively. The temperature ranges from 28.92 to 35.39 • C with an average of 32.11 • C in the study area. The calculated thermal resistivity from an algorithm was found to vary from 48.43 to 81.22 • C-cm/W with an average of 65.56 • C-cm/W which is close to the thermal resistivity values measured in situ. Good correlation exists between the in situ thermal resistivity and calculated thermal resistivity with R = +0.85 suggesting that both methods are reliable.

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Section: Degree Of Saturationsupporting

confidence: 90%

In Situ Determination of Thermal Resistivity of Soil: Case Study of Olorunsogo Power Plant, Southwestern Nigeria

Oladunjoye

Sanuade

2012

ISRN Civil Engineering

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“…The particle density was set to ρ = 3.2 × 10 3 kg m −3 , the heat conductivity λ = 1.33 W/m K and the specific heat c s = 1.01 kJ/kg K were taken from the literature (e.g. Krishnaiah et al 2004;Yingwei 2004). The linear heat expansion coefficient is α = 9.4 × 10 −6 K −1 .…”

Section: Resultsmentioning

confidence: 99%

Formation of chondrules in radiative shock waves

Joham

Dorfi

2012

A&A

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Context. The formation of chondrules in the protoplanetary nebulae causes many questions concerning the formation process, the source of energy for melting the rims, and the composition of the origin material. Aims. The aim of this work is to explore the heating of the chondrule in a single precursor as is typical for radiation hydrodynamical shock waves. We take into account the gas-particle friction for the duration of the shock transition and calculate the heat conduction into the chondrules. These processes are located in the protoplanetary nebulae at a region around 2.5 AU, which is considered to be the most likely place of chondrule formation. The present models are a first step towards computing radiative shock waves occurring in a particle-rich environment. Methods. We calculated the shock waves using one-dimensional, time-independent equations of radiation hydrodynamics involving realistic gas and dust opacities and gas-particle friction. The evolution of spherical chondrules was followed by solving the heat conduction equation on an adaptive grid. Results. The results for the shock-heating event are consistent with the cosmochemical constraints of chondrule properties. The calculations yield a relative narrow range for density or temperature to meet the requested heating rates of R > 10 4 K h −1 as extracted from cosmochemical constraints. Molecular gas, opacities with dust, and a protoplanetary nebula with accretion are necessary requirements for a fast heating process. The thermal structure in the far post-shock region is not fully consistent with experimental constraints on chondrule formation since the models do not include additional molecular cooling processes.

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“…Krishnaiah et al [13] designed a thermal probe to estimate different thermal properties such as thermal resistivity and diffusivity, and specific heat of rocks.…”

Section: Introductionmentioning

confidence: 99%

Measuring of Thermal Conductivities of Soils and Rocks to Be Used in the Calculation of A Geothermal Installation

et al. 2017

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Abstract:The thermal conductivity of soils and rocks constitutes an important property for the design of geothermal energy foundations and borehole heat exchange systems. Therefore, it is interesting to find new alternatives to define this parameter involved in the calculation of very low enthalpy geothermal installations. This work presents the development of an experimental set-up for measurements of thermal conductivity of soils and rocks. The device was designed based on the principle of the Guarded Hot Plate method using as heat source a laboratory heater. The thermal conductivity of thirteen rocky and soil samples was experimentally measured. Results are finally compared with the most common thermal conductivity values for each material. In summary, the aim of the present research is suggesting a procedure to determine the thermal conductivity parameter by a simple and economic way. Thus, increases of the final price of these systems that techniques such as the "Thermal Response Test" (TRT) involvs, could be avoided. Calculations with software "Earth Energy Designer" (EED) highlighted the importance of knowing the thermal conductivity of the surrounding ground of these geothermal systems.

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A methodology for determining thermal properties of rocks

Cited by 36 publications

References 29 publications

In Situ Determination of Thermal Resistivity of Soil: Case Study of Olorunsogo Power Plant, Southwestern Nigeria

In Situ Determination of Thermal Resistivity of Soil: Case Study of Olorunsogo Power Plant, Southwestern Nigeria

Formation of chondrules in radiative shock waves

Measuring of Thermal Conductivities of Soils and Rocks to Be Used in the Calculation of A Geothermal Installation

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