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Journal articles on the topic 'Thermal conductivity in a two-phase medium'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

Palaniswamy, Kumar, Raja Venugopal, and Karthikeyan Palaniswamy. "Effective thermal conductivity modeling with primary and secondary parameters for two-phase materials." Thermal Science 14, no. 2 (2010): 393–407. http://dx.doi.org/10.2298/tsci1002393p.

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In this article, the collocated parameter models are used to estimate the effective thermal conductivity of the two-phase materials including the effect of various inclusions in the unit cell. The algebraic equations are derived using unit cell based isotherm approach for two dimensional spatially periodic medium. The geometry of the medium is considered as a matrix of touching and non-touching in-line octagon and hexagon cylinders. The models are used to predict the thermal conductivity of numerous two-phase materials (maximum conductivity ratio of 1000 and concentration ranging between 0 and

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2

Snarskii, A. O., L. M. Vikhor, and S. O. Podlasov. "Universal Relation for Thermoelectric Figure of Merit of Two-Phase Composites." Journal of Thermoelectricity, no. 2 (June 25, 2025): 17–24. https://doi.org/10.63527/1607-8829-2025-2-17-24.

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In the paper, a universal expression for the effective thermoelectric figure of merit of a composite two-phase material is found based on the isomorphism method. It is shown that to determine the effective thermoelectric figure of merit, a set of values of local kinetic coefficients of the phases, namely electrical conductivity, thermal conductivity, and thermoEMF, and the effective value of the thermoEMF coefficient is quite sufficient to use. To determine the thermoelectric figure of merit, it is not necessary to know the effective coefficients of electrical conductivity and thermal conducti

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3

de Lemos, Marcelo J. S. "A Thermo-Mechanical Model for a Counterflow Biomass Gasifier." Defect and Diffusion Forum 354 (June 2014): 227–35. http://dx.doi.org/10.4028/www.scientific.net/ddf.354.227.

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This article presents a thermo-mechanical approach to investigate heat transfer between solid and fluid phases in a model gasifier. A two-temperature equation approach is applied in addition to a macroscopic model for laminar flow through a porous moving bed. Transport equations are discretized using the control-volume method and the system of algebraic equations is relaxed via the SIMPLE algorithm. The effects on inter-phase heat transfer due to variation of medium permeability, thermal conductivity and thermal capacity are analyzed. Results indicate that for smaller medium permeabilities, as

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Boshenyatov, В. V. "Exact Solutions and Bounds for the Thermal Conductivity Coefficient of a Dispersed Medium." Doklady Rossijskoj akademii nauk. Fizika, tehničeskie nauki 515, no. 2 (2024): 35–42. http://dx.doi.org/10.31857/s2686740024020067.

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Exact solutions for the thermal conductivity coefficient of a two-phase dispersed medium are obtained using the most general physical principles of locality and symmetry. Two solutions define the well-known Hashin–Shtrikman bounds. The third solution, invariant under the phase inversion transformation, significantly narrows the Hashin–Shtrikman boundaries; this is confirmed by comparison with numerous experiments by other authors. It has been shown that taking into account the remote interaction of dispersed particles at their increased concentration only slightly (less than 3%) affects the re

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Zhang, Hai Feng, Peng Xin Li, and Li Qun He. "Estimation of the Temperature-Dependent Thermal Conductivity of Multi-Phase Materials." Advanced Materials Research 340 (September 2011): 34–39. http://dx.doi.org/10.4028/www.scientific.net/amr.340.34.

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Two Models for Estimating the Effective Thermal Conductivity (kE) of Multi-Phase Materials Are Comparatively Investigated. the First Model Is the Effective Medium Approximation (EMA), which Is Based on the Extension of the Percolation Theory. the Second Is the Randomly Mixed Model (RMM), a Numerical Method in which All Components Are Seen as Cubech_cubecucube in Shape and Are Randomly Dispersed inside the Space. Two Models Can Be Directly Applied to Multi-Phase Media without Empirical Parameters. Compared with Experimental Data of Food Materials in the Literature, Two Models both Give Good Est

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Han, Qiang, Zhiguo Wang, and Rui Qin. "Thermal Conductivity Model Analysis of Unsaturated Ice-Containing Soil." Geofluids 2022 (July 12, 2022): 1–15. http://dx.doi.org/10.1155/2022/3717705.

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In cold locales, the thermal conductivity of soil porous media varies according to their composition and the phase state of the substance contained within the pore space. During the winter, water and other media in the soil pore space freeze-thaw, resulting in their phase state, composition, distribution, and significant thermal conductivity changes. There are some shortcomings in the current research regarding the thermal conductivity change pattern of unsaturated ice-containing soils. In this paper, the representative elementary volume (REV) selection method is given for unsaturated ice-cont

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Boshenyatov, Boris V., Anatoliy A. Glazunov, Аleksandr N. Ishchenko, and Yuliya N. Karnet. "Analytical models of thermal conductivity in two-phase dispersive media. 1. Theoretical study." Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika, no. 86 (2023): 35–54. https://doi.org/10.17223/19988621/86/3.

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It is traditionally believed that various theories and formulas for averaging (homogenization) the properties of inhomogeneous dispersive media, which do not take into account the distance interaction of dispersed particles, are applicable only at low volume concentrations of particles 0 < f < 0.1. The molecular heat transfer in two-phase dispersive media, both with and without allowance for the interaction of identical spherical particles, is considered in a mathematically rigorous formulation using the method of physical analogy and the concept of the Lorentz local field. It is shown t

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8

Liu, Shu. "Medium office energy consumption optimization using EnergyPlus." Applied and Computational Engineering 63, no. 1 (2024): 45–55. http://dx.doi.org/10.54254/2755-2721/63/20240992.

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This research paper studies the impacts of HVAC system scheduling and building envelope material properties on the building energy efficiency in the downtown New York City, metropolitan area, that is highly associated with Urban Heat Island. By utilizing EnergyPlus for whole energy building simulation, the research compares two HVAC operational cases: a baseline case with constant temperature setpoints, and an occupancy-based temperature setpoint schedule. The study also investigated the influence of thermal conductivity variations in stucco exterior wall materials, with three cases, the defau

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Naldi, Claudia, Matteo Dongellini, Cesare Biserni, and Gian Luca Morini. "Numerical Modeling of Pure and Metal-Foam Loaded PCMs." Defect and Diffusion Forum 420 (November 14, 2022): 231–41. http://dx.doi.org/10.4028/p-23o6w9.

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Despite many desirable properties, most phase change materials (PCMs) undergo timing issues during the phase change process due to a low thermal conductivity, which limits their application in heat storages. Thus, many techniques have been pointed out to overcome these disadvantages and improve heat transfer, such as coupling PCMs with metal inserts, like high porosity open-cell metal foams. Indeed, the presence of a metal foam increases the effective thermal conductivity of the composite medium and speeds up the charging and discharging phases. In the present paper, a numerical model develope

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10

Nasrabadi, Hadi, Kassem Ghorayeb, and Abbas Firoozabadi. "Two-Phase Multicomponent Diffusion and Convection for Reservoir Initialization." SPE Reservoir Evaluation & Engineering 9, no. 05 (2006): 530–42. http://dx.doi.org/10.2118/66365-pa.

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Summary We present formulation and numerical solution of two-phase multicomponent diffusion and natural convection in porous media. Thermal diffusion, pressure diffusion, and molecular diffusion are included in the diffusion expression from thermodynamics of irreversible processes. The formulation and the numerical solution are used to perform initialization in a 2D cross section. We use both homogeneous and layered media without and with anisotropy in our calculations. Numerical examples for a binary mixture of C1/C3 and a multicomponent reservoir fluid are presented. Results show a strong ef

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11

Hassan, Syed Aadil, Hassaan Ahmed, and Asif Israr. "An Analytical Modeling for Effective Thermal Conductivity of Multi-Phase Transversely Isotropic Fiberous Composites Using Generalized Self-Consistent Method." Applied Mechanics and Materials 249-250 (December 2012): 904–9. http://dx.doi.org/10.4028/www.scientific.net/amm.249-250.904.

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In this paper a theoretical relationship for the effective thermal conductivity of a multiphase transversely isotropic composite system is obtained. The Generalized Self-Consistent Method and simple energy balance principle is employed to derive a more appropriate model. In the derivation, it is assumed that the orientation of fiber within the transversely isotropic composite system is unidirectional and surrounded by two different phases of porous and matrix phase. A combined effect of these three different phases on the effective thermal conductivity of the composite system in transverse dir

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Bai, Su Yuan, Zhe Nan Tang, Zheng Xing Huang, and Yi Feng Gu. "Phase Transition Behaviors and Thermal Conductivity of Ge Doped Sb₂Te Thin Films for Phase Change Random Access Memory." Applied Mechanics and Materials 367 (August 2013): 26–31. http://dx.doi.org/10.4028/www.scientific.net/amm.367.26.

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The Ge doped Sb2Te thin films (Ge2Sb2Te5, Ge0.15Sb2Te and Ge0.61Sb2Te) were deposited by magnetron co-sputtering using Ge and Sb2Te targets. Ge doping effect on the phase transition behaviors and thermal conductivity of the composite films was investigated. Ge0.61Sb2Te thin films have higher crystallization temperature (~200°C), larger crystallization activation energy (~3.28 eV) , better data retention (~120.8 °Cfor 10 years) and lower thermal conductivity (~0.23 W/mK). Ge0.61Sb2Te thin films is considered to be a promising storage medium for phase change random access memory due to its bette

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13

Zhang, M., Peng Cheng Zhai, and Qing Jie Zhang. "The Effective Conductivity of Multiphase Composites with Imperfect Thermal Contact at Constituent Interfaces." Materials Science Forum 631-632 (October 2009): 127–32. http://dx.doi.org/10.4028/www.scientific.net/msf.631-632.127.

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This paper studies the effective thermal conductivity of multiphase composite in which a thermal boundary resistance exists at constituent interfaces. Based on the theoretical framework of conductivity for binary system composites in the presence of a thermal contact resistance between matrix and inclusion given by Y. Benveniste and T. Miloh (1986), the fundamental concept is generalized for the case of multiphase composites with imperfect contact which permits a temperature discontinuity between matrix and inclusions of different phases. A micromechanics model, the “generalized self-consisten

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14

Boshenyatov, Boris V., Anatoliy A. Glazunov, Aleksandr N. Ishchenko, and Yuliya N. Karnet. "Analytical models of thermal conductivity in two-phase dispersion media. 2. Comparison of theoretical and experimental data." Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika, no. 91 (2024): 61–74. http://dx.doi.org/10.17223/19988621/91/6.

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It is traditionally believed that theories and formulas for averaging (homogenization) the physical properties of dispersion media, which exclude the effect of the collective interaction of dispersed particles, are applicable only at low concentrations of the dispersed phase. This opinion was disapproved theoretically and then experimentally in a previous paper. It has been established that with an increase in the concentration of dispersed particles, the main effect on the change in the effective thermal conductivity coefficient of the dispersion medium is exerted by the purely geometric fact

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15

Redkin, Alexander, Evgeniya Il’ina, Svetalana Pershina, et al. "Thermal Properties of Li2BeF4 near Melting Point." Thermo 2, no. 3 (2022): 107–15. http://dx.doi.org/10.3390/thermo2030010.

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The LiF–BeF2 system is used as a heat transfer medium in molten salt reactors (MSRs). The thermal diffusivity of Li2BeF4 was studied using the laser flash analysis (LFA) method in solid and transition states. While the thermal diffusivity is shown to decrease slightly in solid-state Li2BeF4, it drops significantly at temperatures close to phase transition. The heat capacity of Li2BeF4 was measured by differential scanning calorimetry (DSC). Some differences were observed between the results obtained in cooling and heating modes. Thermal conductivity was calculated using thermal diffusivity-, d

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16

Kostornov, A. G., A. A. Shapoval, and I. V. Shapoval. "Skeletal heat conductivity of porous metal fiber materials." Kosmìčna nauka ì tehnologìâ 27, no. 2 (2021): 70–77. http://dx.doi.org/10.15407/knit2021.02.070.

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The influence of a number of physical characteristics and parameters of metallic fiber materials on their thermal conductivity is studied in this work. Such porous materials are intended, among other things, for their effective use in two-phase heat transfer devices (heat pipes). The use of heat pipes in aircraft and space vehicles provides a number of thermophysical advantages. In particular, heat pipes significantly expand the possibilities of air cooling of heat-loaded technical devices. The thermal conductivity of capillary-porous materials-structures, which are important elements of heat

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17

Adamenko, I. N., and K. È. Nemchenko. "Thermal conductivity due to two-component gas of thermal excitations." Low Temperature Physics 22, no. 9 (1996): 759–66. https://doi.org/10.1063/10.0034083.

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The effective thermal conductivity of a continuous medium containing a two-component gas of thermal excitations and scattering centers is calculated. The result is valid for any relation between the times of interactions of various thermal excitations with one another and with scattering centers. It is shown that, in addition to partial and flow contributions, the effective thermal conductivity also contains a component associated with diffusion of thermal excitation gas. The obtained expressions, which are valid for any energy–momentum relation, are used for calculating effective thermal cond

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18

Lin, Saw Chun, and Hussain H. Al-Kayiem. "Thermal Reliability of Paraffin Wax Phase Change Material for Thermal Energy Storage." Applied Mechanics and Materials 699 (November 2014): 263–68. http://dx.doi.org/10.4028/www.scientific.net/amm.699.263.

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Phase change materials (PCMs) as thermal energy storage medium are proven to be effective to enhance the performance of solar thermal system. The degradation of the thermal properties due to thermal cycles is changeable and accordingly the performance of the solar thermal cycle may decline. In this study, the thermal reliability of paraffin wax was investigated to analyse the ability to be used as thermal energy storage (TES) for solar water heating purposes that subjected to many phase change cycles. The mixtures were subjected to 400 phase change cycles and the thermal properties were measur

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19

Lemczyk, T. F., B. L. Mack, J. R. Culham, and M. M. Yovanovich. "PCB Trace Thermal Analysis and Effective Conductivity." Journal of Electronic Packaging 114, no. 4 (1992): 413–19. http://dx.doi.org/10.1115/1.2905474.

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The electrical current carrying capability of a surface or buried trace located within a fiberglass printed circuit board (PCB), is of important interest in the microelectronics industry. The maximum allowable trace power, hence local integrity and maximum allowable operating temperature, will depend on several parameters including the circuit board thermal conductivity, thickness, trace size and location. A two-dimensional, steady-state thermal conduction analysis is made on a finite, plane homogeneous medium (PCB), to examine the trace behavior. The trace is modeled as a zero-thickness, stri

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20

Kurkina, E. S. "Two-Dimensional and Three-Dimensional Thermal Structures in a Medium with Nonlinear Thermal Conductivity." Computational Mathematics and Modeling 16, no. 3 (2005): 257–78. http://dx.doi.org/10.1007/s10598-005-0023-8.

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21

Spilak, Dominik, Katarina Dubravska, Andrea Majlingova, Cong Jin, Qiang Xu, and Lin Jiang. "Modification of computer-aided modelling input data based on medium-scale fire tests of wooden beams." BioResources 20, no. 1 (2024): 1230–50. https://doi.org/10.15376/biores.20.1.1230-1250.

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The aim of the paper was to optimize the settings of the material properties of a computer model describing heat transfer in a wooden beam exposed to thermal loading from a porcelain radiation panel. The methodology was based on performing medium-scale fire tests as a basis for a creation of finite element model with 6 different setups of material characteristics based on the outputs of tests. When adjusting the settings, the T-history method was used to determine a beginning and end of a phase change of the water content in the wood, a thermal conductivity was adjusted based on a density and

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22

Ahmed, Ibrahim-Elkhalil, Ahmed E. Abouelregal, Doaa Atta, and Meshari Alesemi. "A fractional dual-phase-lag thermoelastic model for a solid half-space with changing thermophysical properties involving two-temperature and non-singular kernels." AIMS Mathematics 9, no. 3 (2024): 6964–92. http://dx.doi.org/10.3934/math.2024340.

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<abstract> <p>The thermal and mechanical properties of materials show differences depending on the temperature change, which necessitates consideration of the dependence of the properties of these materials on this change in the analysis of thermal stress and deformation of the material. As a result, in the present work, a mathematical framework for thermal conductivity was formulated to describe the behavior of non-simple elastic materials whose properties depend on temperature changes. This derived model includes generalized fractional differential operators with non-singular ker

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23

Kuvyrkin, George, Inga Savelyeva, and Daria Kuvshinnikova. "Nonlocal Thermodynamics: Mathematical Model of Two-Dimensional Thermal Conductivity." E3S Web of Conferences 321 (2021): 03005. http://dx.doi.org/10.1051/e3sconf/202132103005.

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Nonlocal models of thermodynamics are becoming more and more popular in the modern world. Such models make it possible to describe materials with a complex structure and unique strength and temperature properties. Models of nonlocal thermodynamics of a continuous medium establish a relationship between micro and macro characteristics of materials. A mathematical model of thermal conductivity in nonlocal media is considered. The model is based on the theory of nonlocal continuum by A.K. Eringen. The interaction of material particles is described using local and nonlocal terms in the law of heat

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Deptulski, Rafael, Gisele Vieira, and Rachid Bennacer. "Active wall through a porous media foam type: flow and transfer characterization." MATEC Web of Conferences 330 (2020): 01052. http://dx.doi.org/10.1051/matecconf/202033001052.

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Despite the efforts to develop new solutions to achieve the objectives of positive buildings in energy, a few studies in this area has been performed using a porous media foam type. The aim of this paper is to present the behaviour transfers of flow through a multi-structured porous media and to achieve the influence of the porosity and the thermal conductivity properties of the skeletal phase, and the interaction with a cross flow in order to get the equivalent of a perfect insulator. Therefore, in a specially made device, a finite volume method was applied to study a flow through a porous me

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T.P, Gokul Depuk, Sunil Chandel, and Suresh Srivastava. "Performance Enhancement of Phase Change Material (PCM) using Porous Medium for Electronics Cooling in Aerospace: A Review with Research Challenges." International Journal of Environmental Sciences 11, no. 1s (2025): 537–51. https://doi.org/10.64252/s1933524.

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The investigation on the current research depends on the process of melting presented in an irregular-geometry accumulated with PCM and high-porous-matrix along with thermal conductivity numerically. Therefore, the utilization of numerical models in the existing research resolves the conservation of equations on volume averaged for energy, mass and momentum along with PCM presented in the porous-medium. Introduction of enhancement of thermal conductivity via stationary structures with the discussion on issues faced in aerospace on electronic cooling systems has been examined. The assumptions o

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Voigt, Immanuel, Rico Schmerler, Hannes Korn, and Welf-Guntram Drossel. "Heat-Transfer Properties of Additively Manufactured Aluminum Lattice Structures in Combination with Phase Change Material." Materials 17, no. 7 (2024): 1672. http://dx.doi.org/10.3390/ma17071672.

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Compared to sensible heat storage, latent heat storage provides higher energy density due to the enthalpy difference of the storage medium undergoing a phase change. However, the heat storage capability of phase change materials is opposed by low thermal conductivity. To enable sufficient heat transfer within a latent heat storage unit, phase change materials can be used in combination with a metallic matrix. One approach is the infiltration of phase change materials into additively manufactured metallic lattice structures. In this work, the fabrication of aluminum lattice structures through l

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Pietrak, K., P. Furmański, and P. Łapka. "Effective thermal conductivity of composites with anisotropic particles of various shapes embedded in an isotropic matrix." Journal of Physics: Conference Series 2423, no. 1 (2023): 012019. http://dx.doi.org/10.1088/1742-6596/2423/1/012019.

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Abstract The paper demonstrates a method to calculate effective thermal conductivity in a two-phase medium with an isotropic host phase and embedded anisotropic particles. The presented scheme enables easy incorporation of various regular shapes of filler particles if the principal values of their Eshelby tensor are supplied. Basic shapes, such as spheroids, may approximate a wide range of fillers used to enhance thermal conduction, such as polymers filled with highly conductive metal and ceramic powders, graphite and graphene flakes, and nanotubes. Different spatial orientations and sizes of

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Wang, Jie, Xinzhu Duan, Liangfei Gong, and Shuyan Nie. "Interfacial and Filler Size Effects on Mechanical/Thermal/Electrical Properties of CNTs-Reinforced Nanocomposites." Polymers 16, no. 6 (2024): 808. http://dx.doi.org/10.3390/polym16060808.

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The mechanical/thermal/electrical properties on-demand design of CNTs-reinforced nanocomposites is a key scientific issue that limits the development of new-generation smart nanomaterials, and the establishment of a corresponding unified theoretical prediction model for the mechanical/thermal/electrical properties is the foundation of nanocomposites. Based on the equivalent medium theory (EMT) obtained by Maxwell far-field matching, a unified mechanical/thermal/electrical modified EMT model is established by introducing Young’s modulus, thermal conductivity, and electrical conductivity to the

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Gori, Fabio, and Sandra Corasaniti. "Theoretical Prediction of the Soil Thermal Conductivity at Moderately High Temperatures." Journal of Heat Transfer 124, no. 6 (2002): 1001–8. http://dx.doi.org/10.1115/1.1513573.

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The theoretical model of the present paper assumes the unit cell of the porous medium as composed of a cubic space with a cubic solid particle at the center. The thermal conductivity is evaluated by solving the heat conduction equation with the assumption of parallel isotherms within the cubic space. The liquid water in the porous medium is distributed around the solid particle according to the phenomena of adsorption and capillarity. The thermal conductivity of the gas present within the pores takes into account the thermal conductivity of the water vapor and dry air, without enhanced vapor d

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Bae, Jiyeol, Suho Kim, Kwangsoo Kim, and Soyoung Baek. "Impregnation of Activated Carbon with Organic Phase-Change Material." Materials 17, no. 1 (2023): 67. http://dx.doi.org/10.3390/ma17010067.

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In this study, we developed a thermal storage medium comprising porous activated carbon filled with organic phase-change materials (PCMs) that utilizes the latent heat of phase-change to absorb heat during heating and release heat during cooling. For the activated carbon, we used both charcoal-based powdered activated carbon (250–350 mesh) and granular activated carbon. The organic phase-change materials used in the experiments were dodecane, tridecane, tetradecane, and pentadecane. Material properties such as thermal conductivity, latent heat, and melting temperature range were evaluated expe

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Chen, Chen, Wenhua Xue, Shan Li, et al. "Zintl-phase Eu2ZnSb2: A promising thermoelectric material with ultralow thermal conductivity." Proceedings of the National Academy of Sciences 116, no. 8 (2019): 2831–36. http://dx.doi.org/10.1073/pnas.1819157116.

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Zintl compounds are considered to be potential thermoelectric materials due to their “phonon glass electron crystal” (PGEC) structure. A promising Zintl-phase thermoelectric material, 2-1-2–type Eu2ZnSb2 (P63/mmc), was prepared and investigated. The extremely low lattice thermal conductivity is attributed to the external Eu atomic layers inserted in the [Zn2Sb2]2- network in the structure of 1-2-2–type EuZn2Sb2(P3¯m1), as well as the abundant inversion domain boundary. By regulating the Zn deficiency, the electrical properties are significantly enhanced, and the maximum ZT value reaches ∼1.0 a

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Zenkour, Ashraf M., and Ahmed E. Abouelregal. "Laser Pulse Heating of a Semi-Infinite Solid Based on a Two-Temperature Theory with Temperature Dependence." Journal of Molecular and Engineering Materials 05, no. 03 (2017): 1750008. http://dx.doi.org/10.1142/s2251237317500083.

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A two-temperature theory of the generalized thermoelasticity is proposed to study the effect of temperature dependence on a semi-infinite medium. The surface of bounding plane of the medium is under a non-Gaussian laser pulse. Lamé’s coefficients and the thermal conductivity are supposed as temperature-dependent linear functions. The dual-phase-lags (DPLs) theory of the generalized thermoelasticity is applied to treat with the present problem. The analytical solution for different boundary conditions may be deduced by using Laplace transform technique. The numerical results are obtained by usi

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Gil'derman, Viktor Karlovich, and Boris Dmitrievich Antonov. "Electrical conductivity and thermal expansion materials on the basis of Pr2-ySryNi1-xCuxO4 (x = 0/1: y = 0/0.15) for cathode of medium temperature electrochemical devices." Electrochemical Energetics 12, no. 2 (2012): 59–63. http://dx.doi.org/10.18500/1608-4039-2012-12-2-59-63.

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The phase composition, thermal coefficient of linear expansion and electrical conductivity of Pr1.85Sr0.15Ni1-хCuхO4 (0.0; 0.1; 0.5; 0.9 and 1) Pr2NiO4 and Pr2CuO4 are investigated at air in the temperature range 100–1000°C. The thermal coefficient of linear expansion are in range of (11.2–16.6)⋅10-6 deg-1. The TCLE of some composition close to TCLE of solid electrolyte La0.9Sr0.1Ga0.8Mg0.2O2.85 (LSGM) и Ce0.9Gd0.1O2-δ (CGO). Pr1.85Sr0.15Ni0.1Cu0.9О4 has the highest conductivity at temperatures above 350°С.

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Różański, Adrian. "Temperature Changes in the Vicinity of Thermally Loaded Structure Embedded in the Soil: Effect of Sand Content and Saturation Degree." Studia Geotechnica et Mechanica 39, no. 2 (2017): 61–71. http://dx.doi.org/10.1515/sgem-2017-0016.

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Abstract Due to the rapid development of geothermal technologies, the problem of efficient and proper evaluation of soil thermal conductivity becomes extremely important. Factors mostly affecting the soil conductivity are the conductivity of solid phase and the degree of saturation. The former one is mainly affected by the mineral composition, in particular, by the content of quartz whose conductivity is the highest one among all the minerals forming soil skeleton. Organic matter, because of its relatively low conductivity, influences the solid conductivity as well. The problem addressed in th

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Maharani, Farikha, and Indah Hartati. "A Brief Review and Its Incorporation with Bibliometric Analysis of Phase Change Materials for Thermal Energy Storage." Research In Chemical Engineering (RiCE) 2, no. 1 (2023): 01–07. http://dx.doi.org/10.30595/rice.v2i1.64.

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Reduction of Food Losses and Wastes (FLW) through the use of cold chain is one strategy applied in accelerating the SDGs goals of zero hunger. The application of Thermal Energy Storage (TES) based on PCM (Phase Change Material) is considered as one of best efforts for the simultaneous reduction of food losses and wastes, reduction of energy consumption as well as preserve the right temperature for food product. This paper presents the review of phase change material for thermal energy purposes and its bibliometric analysis. Bibliometric analysis on term of cold chain logistics show that there

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Mizonov, Vadim, Andrei Tikhonov, Elena Basova, and Andrei Mitrofanov. "Modeling of Thermal Conductivity in a Medium with Phase Transition with a Moving Boundary of Phase Change." Problems of the Regional Energetics, no. 3(51) (August 2021): 53–61. http://dx.doi.org/10.52254/1857-0070.2021.3-51.05.

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This work is devoted to the theoretical study of the effect of the phase interface motion on thermal conductivity in a liquid-solid nonlinear medium with a phase transition. The problem under consideration deals with the Stefan problems. Its most significant feature is the jump in the phase properties at separation of their moving boundaries. The objective was achieved by solving the following tasks: the construction of the process mathematical model based on its cell representation and with the use of the Markov chain theory mathematical apparatus, performing numerical experiments with the de

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Jahangir, Adnan, Fizza Malik, Nazir Muhammad, Rabia Fayyaz, Javeria Nawaz Abbasi, and Amna Nazir. "Reflection phenomena of waves through rotating elastic medium with micro-temperature effect." REVIEWS ON ADVANCED MATERIALS SCIENCE 59, no. 1 (2020): 455–63. http://dx.doi.org/10.1515/rams-2020-0036.

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AbstractIn this article, we analyzed the effect of variable thermal conductivity on reflected elastic waves. The waves are propagating through a thermoelastic medium rotating with some angular frequency. The concept of micro-temperature is also been considered, in which microelements of the medium contain a high temperature. A heat conduction phenomenon is encountered by dual phase-lag heat conduction model. P (or SV)-type wave is incident on the medium with some specific angle of incidence. After reflection from the surface incident, P-wave is converted into quasi longitudinal and quasi trans

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JEON, P. S., H. J. KIM, and J. YOO. "A THEORETICAL STUDY FOR PHOTOTHERMAL DEFLECTION FOR THE THERMAL CONDUCTIVITY MEASUREMENT OF ANISOTROPIC MATERIALS." Modern Physics Letters B 22, no. 11 (2008): 905–10. http://dx.doi.org/10.1142/s0217984908015589.

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We have analyzed the three-dimensional thermal conduction in anisotropic materials using nonsymmetric-Fourier transforms. The distribution of temperature fields which corresponds to the variation of the anisotropic ratio of thermal conductivities was obtained. The differences of the temperature fields for each material give rise to distinctions in the deflection of a probe beam. By using the relation between the temperature fields and the deflection of the probe beam, a complete theoretical treatment of the photothermal deflection has been performed for thermal conductivity measurement in an a

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Dong, Xihao, Shuai Liu, and Yuanxiang Yu. "The Variation Mechanism of Thermal Properties of Loess with Different Water Contents during Freezing." Advances in Civil Engineering 2021 (May 19, 2021): 1–12. http://dx.doi.org/10.1155/2021/9990051.

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The thermal properties of soils are affected by many factors, such as temperature, water content, and structure. Based on the transient plane source method of thermal physics, the thermal properties of loess with different water content during the freezing process were tested. We analyzed the variation mechanism of thermal properties from the perspective of phase change. Based on the Pore/Particle and Crack Analysis System (PCAS) and theory of heat transfer, we then analyzed the microstructure and heat conduction process of loess. And a calculation model of volumetric heat capacity of frozen s

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Ternik, Primoz, Matej Zadravec, and Rebeka Rudolf. "Numerical analysis of the NiTi solidification process influence of thermal conductivity." Science of Sintering 49, no. 1 (2017): 39–49. http://dx.doi.org/10.2298/sos1701039t.

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The present study deals with the numerical analysis of the solidification process of a NiTi binary alloy. The physical medium is taken as an incompressible fluid where the heat is transferred by conduction and convection, including the thermal phase change phenomenon. The energy equation, which includes both convection-diffusion heat transfer and a mushy region for the phase-change (solidification), is modelled by using an enthalpy-based formulation. The numerical approach is based on the finite volume method in body fitted coordinates with a PISO scheme to couple the pressure and velocity fie

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Jalil, Jalal M., and Shrooq J. Ali. "Thermal Investigations of Double Pass Solar Air Heater with Two Types of Porous Media of Different Thermal Conductivity." Engineering and Technology Journal 39, no. 1A (2021): 79–88. http://dx.doi.org/10.30684/etj.v39i1a.1704.

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This study describes an experimental investigation of the thermal efficiency of stainless steel mesh and steel wool as a porous medium in the lower channel of a double pass solar air heater. An experimental setup was planned and developed. Various types of porous media with high thermal conductivity and with different porosities have been tested. The effects of the porosity of wire mesh, the thermal conductivity of porous media, mass flow rate, and the intensity of radiation have been studied. Experimental results show that thermal efficiency with using porous media is greater than without usi

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Fikri, M. Arif, Subbarama Kousik Suraparaju, M. Samykano, et al. "Enhanced Thermal Properties of Phase Change Materials through Surfactant-Functionalized Graphene Nanoplatelets for Sustainable Energy Storage." Energies 16, no. 22 (2023): 7668. http://dx.doi.org/10.3390/en16227668.

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Phase change materials (PCMs) are increasingly gaining prominence in thermal energy storage due to their impressive energy storage capacity per unit volume, especially in applications with low and medium temperatures. Nevertheless, PCMs have significant limitations regarding their ability to conduct and store heat, primarily due to their inadequate thermal conductivity. One potential solution for improving the thermal conductivity of PCMs involves the inclusion of nanoparticles into them. However, a recurring issue arises after several thermal cycles, as most nanoparticles have a tendency to c

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Osaze, Osasu, and Sanjeev Khanna. "Experimental Thermal Conductivity Measurement of Hollow-Structured Polypropylene Material by DTC-25 and Hot Box Test." Buildings 13, no. 12 (2023): 3094. http://dx.doi.org/10.3390/buildings13123094.

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In this study, experimental measurements of porous polypropylene (PP) using the DTC-25 TA laboratory equipment and a hot box test are compared. The thermal conductivity of building materials indicates their insulation capability. Excellent building materials will have a lower thermal conductivity value as well as other building insulator performance metrics. While results show that increasing the volume fraction of fluid in porous PP has an inverse association with the thermal conductivity of the material, as predicted by porous media theories, there is a marked difference in the measured valu

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Wu, Jun Yan, Fei Chen, Ming Zhong Li, Qiang Shen, and Lian Meng Zhang. "Thermal Conductivity Design and Evaluation of Zirconium Phosphate Bonded Silicon Nitride Porous Ceramics." Key Engineering Materials 508 (March 2012): 21–26. http://dx.doi.org/10.4028/www.scientific.net/kem.508.21.

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In this Paper, Five Fundamental Effective Thermal Conductivity Structural Models (Series, Parallel, Two Forms of Maxwell-Eucken and Effective Medium Theory) Were Used to Analyze and Design Silicon Nitride Porous Ceramics. Then α-Si3N4Matrix Porous Ceramics Were Prepared with ZrP2O7as a Binder and Thermal Conductivity of ZrP2O7Bonded Si3N4Porous Ceramic Was Evaluated. ZrP2O7Bonded Si3N4Porous Ceramic Had Open and Interconnected Pore Structure which is either in EMT or in Maxwell-Euken 2. The Thermal Conductivity of ZrP2O7Bonded Si3N4Porous Ceramics Changes from 2.0 to 0.5 W/m•K with Increasing

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Li, Zhuo, and Zhi-Gen Wu. "Development of medium-temperature composite phase change material with high thermal stability and conductivity." Solar Energy Materials and Solar Cells 155 (October 2016): 341–47. http://dx.doi.org/10.1016/j.solmat.2016.06.027.

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Azadbakhti, Reza, Farzad Pourfattah, Abolfazl Ahmadi, Omid Ali Akbari, and Davood Toghraie. "Eulerian–Eulerian multi-phase RPI modeling of turbulent forced convective of boiling flow inside the tube with porous medium." International Journal of Numerical Methods for Heat & Fluid Flow 30, no. 5 (2019): 2739–57. http://dx.doi.org/10.1108/hff-03-2019-0194.

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Purpose The purpose of this study is simulation the flow boiling inside a tube in the turbulent flow regime for investigating the effect of using a porous medium in the boiling procedure. Design/methodology/approach To ensure the accuracy of the obtained numerical results, the presented results have been compared with the experimental results, and proper coincidence has been achieved. In this study, the phase change phenomenon of boiling has been modeled by using the Eulerian–Eulerian multi-phase Rensselaer Polytechnic Institute (RPI) wall boiling model. Findings The obtained results indicate

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Ahmed, Mustafa K., and Abdul Jabbar N. Khalifa. "Transforming Traditional Photovoltaic Panels into Thermal/ Photovoltaic Panels Incorporating Composite-Phase Change Materials." Al-Nahrain Journal for Engineering Sciences 27, no. 3 (2024): 320–27. https://doi.org/10.29194/njes.27030320.

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Solar panels are constantly evolving, with changes occurring in the materials used, panel shapes, and the method used to attach solar cells to the panels. Solar radiation consists of two components: photovoltaic energy, which is used to generate electricity via photovoltaic panels, and thermal energy, which, on the other hand, can reduce the efficiency of photovoltaic panels. Thermal photovoltaic panels are a recent breakthrough in the industry as they use light to generate energy and heat to reheat cryogenic liquid for a variety of purposes. One subtype that is gaining popularity is hybrid ph

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Yan, Zhizhong, and Ercong Cheng. "A Novel Monte Carlo Method to Calculate the Thermal Conductivity in Nanoscale Thermoelectric Phononic Crystals Based on Universal Effective Medium Theory." Mathematics 11, no. 5 (2023): 1208. http://dx.doi.org/10.3390/math11051208.

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Thermal reduction by enhancing heat-generation phonon scattering can improve thermoelectric performance. In this paper, the phonon transport subjected to internal heat generation in two-dimensional nanoscale thermoelectric phononic crystals is investigated by a novel Monte Carlo method based on the universal effective medium theory, called the MCBU method. The present approach is validated. Compared with the universal effective medium theory method, the MCBU method is easier to implement. More importantly, the deviation of the computation time between the two methods can be ignored. With almos

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Wu, Yangyang, Baichao Wang, Dong Li, and Changyu Liu. "Effect of timeliness on the thermal properties of paraffin-based Al2O3 nanofluids." Modern Physics Letters B 33, no. 05 (2019): 1950051. http://dx.doi.org/10.1142/s0217984919500519.

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Paraffin is an excellent photo-thermal conversion phase change energy storage material, and extensively used in the thermal storage field at the medium-low temperature. However, the low thermal conductivity of paraffin restricts its application in practice. Adding nanoparticles into paraffin is one of the effective methods to improve its thermal conductivity. Nevertheless, the thermal diffusivity, specific heat and volumetric heat capacity of paraffin as well as timeliness were affected after the addition of nanoparticles. In this paper, the influences of volume fraction of Al2O3 nanoparticle

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Ma, Xiaoyan, Farid Benboudjema, and Rachid Bennacer. "Thermal and water transfer in cementitious porous medium: thermal building and durability." MATEC Web of Conferences 240 (2018): 01023. http://dx.doi.org/10.1051/matecconf/201824001023.

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Cementitious materials are typical porous medium, which are widely used in civil engineering and thermal buildings. The thermal and hydrate properties of the material are fundamental to predict accurately the energy needs and the reliable duration of the structures in a long term. Due to the complicated coupling, the thermal capacity, conductivity and source term in energy equation are affected by the humidity distribution and the microstructure evolution of the porous materials. The coupling relation of thermal and hydrate properties are summarized in this work, the coupled drying model is di

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