A Novel Portable Absolute Transient Hot-Wire Instrument for the Measurement of the Thermal Conductivity of Solids

Assael, Marc J.; Antoniadis, Konstantinos; Metaxa, Ifigeneia N.; Mylona, Sofia K.; Assael, John Alexander M; Wu, Jiangtao; Hu, Miaomiao

doi:10.1007/s10765-015-1964-6

Cited by 30 publications

(15 citation statements)

References 23 publications

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“…The appropriateness of a method is further determined by such considerations as the physical nature of the material, the geometry of samples available, the required accuracy of results, the speed of operation and the time and funds entailed [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Temperature dependency of thermal conductivity of solid phases for fatty acids

Bayram

Aksöz

Maraşlı

2014

J Therm Anal Calorim

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Thermal conductivity variations with temperature of solid phases for lauric acid (LA), myristic acid (MA), pivalic acid (PA), and stearic acid (SA) have been measured with radial heat-flow method. Temperature dependencies of the thermal conductivity for same organic materials have been obtained by linear regression analysis. From graphs of thermal conductivity versus temperature, the thermal conductivity of solid phase at their melting temperature and temperature coefficients of thermal conductivity for LA, MA, PA, and SA have been found to be 0.37, 0.39, 0.23, and 0.35 W K -1 m -1 and 0.00935, 0.00446, 0.01095, and 0.00295 K -1 , respectively. The ratios of thermal conductivity of liquid phase to thermal conductivity of solid phase for LA, MA, PA, and SA have also been measured to be 0.52, 0.48, 0.25, and 0.59, respectively, with a Bridgman-type directional solidification apparatus.

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Section: Introductionmentioning

confidence: 99%

Temperature dependency of thermal conductivity of solid phases for fatty acids

Bayram

Aksöz

Maraşlı

2014

J Therm Anal Calorim

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“…Therefore, our samples belong to "sand" samples. Considering that there would be moisture in the test samples, a hot wire transient method (ASTM C1113) is used for the thermal conductivity measurement (Assael, et al 2002). Steady state methods usually require long time during testing and the results would be highly affected by moisture redistribution in the test samples.…”

Section: Experimental Methods Preparation and Characterization Of Sandmentioning

confidence: 99%

Fractal Approach to Calculate the Thermal Conductivity of Moist Soil

Cai¹,

Cui²,

Zheng³

et al. 2017

Proceedings of the IGSHPA Technical/Research Conference and Expo 2017

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The ground heat exchanger (GHE) is a key component in the design of a GSHP system and the effective thermal conductivity is one of the most important parameters that determine the heat transfer underground. In this paper, the effect of particle sizes and distributions on the sand thermal conductivity were studied both experimentally and analytically. Fractal method was considered for simulating the thermal conductivity of both dry and moist, unsaturated sand. Seven types of dry sand samples and six types of moist, unsaturated sand were selected in the experiments and results showed that both porosity, fractal dimension and particle size ratio affect the sand thermal conductivity. Based on the fractal theory, the fractal models were applied to predict the sand thermal conductivity under both dry and wet conditions. By comparing to the experimental findings, the proposed model was able to predict the variation on the sand thermal conductivity. However, the contact thermal resistance and water distribution pattern are two key impacts on the soil behaviors and need to be further studied.

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“…In order to describe the transient response of such systems, the heat exchange between he phases must also be taken into account [7]. As techniques such as the Transient Hot Wire Method are commonly used to determine the effective thermal conductivity of a material [8], these effects may become a source of error in the measurement of effective properties.…”

Section: Introductionmentioning

confidence: 99%

A Multi-Scale, Semi-Analytical Model for Transient Heat Transfer in a Nano-Composite Containing Spherical Inclusions

Dobri

Papathanasiou

2019

Eurasian Chem. Tech. J.

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This paper presents a semi-analytical model for transient heat conduction in a composite material reinforced with small spherical inclusions. Essential to the derivation of the model is the assumption that the size of the inclusions is much smaller than the length scale characterizing the macroscopic problem. An interfacial thermal resistance is also present between the two phases. During heating, the inclusions are treated as heat sinks within the matrix, with the coupling provided by the boundary conditions at the surface of the embedded particles. Application of Duhamel’s Theorem at the particle scale provides the local relationship between the temperature profile in a particle and the matrix that surrounds it. A simple spatial discretization at the macro-scale leads to an easily solvable system of coupled Ordinary Differential Equations for the matrix temperature, particle surface temperature and a series of ψ-terms related to the heat exchange between phases. The interfacial thermal resistance between the two phases can lead to the particle temperature lagging behind that of the surrounding matrix. The resulting transient response of the matrix temperature cannot be reproduced by a material with a single effective thermal conductivity. In the case where transient methods are used to determine effective thermal conductivity, this transient response may introduce errors into the measurement.

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A Novel Portable Absolute Transient Hot-Wire Instrument for the Measurement of the Thermal Conductivity of Solids

Cited by 30 publications

References 23 publications

Temperature dependency of thermal conductivity of solid phases for fatty acids

Temperature dependency of thermal conductivity of solid phases for fatty acids

Fractal Approach to Calculate the Thermal Conductivity of Moist Soil

A Multi-Scale, Semi-Analytical Model for Transient Heat Transfer in a Nano-Composite Containing Spherical Inclusions

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