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Relevant bibliographies by topics / Thermal conductivity in a two-phase medium

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Academic literature 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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Journal articles on the topic "Thermal conductivity in a two-phase medium"

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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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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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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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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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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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Dissertations / Theses on the topic "Thermal conductivity in a two-phase medium"

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Ячменьов, Володимир Олександрович, Владимир Александрович Ячменев, Volodymyr Oleksandrovych Yachmenov, Валентина Володимирівна Ніколенко, Валентина Владимировна Николенко та Valentyna Volodymyrivna Nikolenko. "Решение задачи Стефана в случае нелокальных процессов". Thesis, Сумский государственный университет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/65444.

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Mansour, Salwa. "Contribution to certain physical and numerical aspects of the study of the heat transfer in a granular medium." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S088/document.

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L'étude du transfert de chaleur et de masse dans les milieux poreux saturés et insaturés fortement chauffés à leur surface possèdent de nombreuses applications, notamment en archéologie, en agriculture et en géothermie. La première partie de ce travail concerne l'amélioration de la méthode AHC (Accumulation de chaleur latente) qui permet de traiter le changement de phase, dans un milieu homogène : l'intervalle de changement de température au moment du changement de phase apparaît comme un paramètre important, et il doit être choisi proportionnel à la taille des mailles. Des résultats à la fois

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Lin, Chia-ching, and 林佳慶. "Thermal Conductivity of Two Phase Composites." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/63621341488354344815.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>95<br>The heat dispersal and thermal expansion are issues of the paramount importance in high power integrated circuits, and other areas of electronics. The attributes existing in a composite such as a different volume fraction, grain size, contiguity or porosity, etc. determine a thermal conductivity of composite. To achieve a good heat dispersal technique, this study obtained the information by simulation which is time and energy frugal. By using the Monte Carlo method to consider phase boundaries, one can derive the thermal conductivity of composite on various m

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Li, Chin-Lung, and 李金龍. "Two Phase Fluid VC Utilized in LED Bulb for Thermal Conductivity Efficiency Analysis." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/99986568209460058698.

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碩士<br>龍華科技大學<br>工程技術研究所<br>99<br>In 21st century now, technology advancement changes our daily lives. Energy saving and carbon footprint reduction has been the major consideration nowadays to promote environmental awareness is the main focus. The major problem in LED application is the thermal management. When LED package operating temperature (referring to Tj) is >120 degC, luminance degradation happens. LED is a semiconductor product where the light emitted as a result of combination of electrons & holes at the depletion layer of the semiconductor. The light conversion efficiency is approxim

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Chung, Chen Tsi, and 陳志強. "effect of radius distribution of particles on diffusion controlled reaction rate ，effective thermal conductivity and effective diffusivity in the two-phase including spheres particle system." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/21083181305241374137.

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Bali, Ashoka. "Study of Thermoelectric Properties of Lead Telluride Based Alloys and Two-Phase Compounds." Thesis, 2014. http://etd.iisc.ac.in/handle/2005/2950.

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The growing need of energy worldwide has lead to an increasing demand for alternative sources of power generation. Thermoelectric materials are one of the ‘green energy sources’ which convert directly heat into electricity, and vice–versa. The efficiency of this conversion is dependent on ‘figure of merit’ (z T), which depends on the material’s Seebeck coefficient (S), electrical resistivity (ρ) and thermal conductivity (κ) through the relation z T=S2T/ρκ, where T is the temperature. High values of z T lead to high efficiency, and therefore, z T must be maximized. Lead telluride is well–establ

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Bali, Ashoka. "Study of Thermoelectric Properties of Lead Telluride Based Alloys and Two-Phase Compounds." Thesis, 2014. http://hdl.handle.net/2005/2950.

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The growing need of energy worldwide has lead to an increasing demand for alternative sources of power generation. Thermoelectric materials are one of the ‘green energy sources’ which convert directly heat into electricity, and vice–versa. The efficiency of this conversion is dependent on ‘figure of merit’ (z T), which depends on the material’s Seebeck coefficient (S), electrical resistivity (ρ) and thermal conductivity (κ) through the relation z T=S2T/ρκ, where T is the temperature. High values of z T lead to high efficiency, and therefore, z T must be maximized. Lead telluride is well–establ

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Books on the topic "Thermal conductivity in a two-phase medium"

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United States. National Aeronautics and Space Administration., ed. Effective thermal conductivity of an aluminum foam + water two phase system: A thesis ... National Aeronautics and Space Administration, 1996.

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Delil, A. A. M. Considerations concerning a thermal joint for a deployable or steerable battery radiator for the Columbus Polar Platform. National Aerospace Laboratory, 1986.

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Horing, Norman J. Morgenstern. Random Phase Approximation Plasma Phenomenology, Semiclassical and Hydrodynamic Models; Electrodynamics. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198791942.003.0010.

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Chapter 10 reviews both homogeneous and inhomogeneous quantum plasma dielectric response phenomenology starting with the RPA polarizability ring diagram in terms of thermal Green’s functions, also energy eigenfunctions. The homogeneous dynamic, non-local inverse dielectric screening functions (K) are exhibited for 3D, 2D, and 1D, encompassing the non-local plasmon spectra and static shielding (e.g. Friedel oscillations and Debye-Thomas-Fermi shielding). The role of a quantizing magnetic field in K is reviewed. Analytically simpler models are described: the semiclassical and classical limits an

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Book chapters on the topic "Thermal conductivity in a two-phase medium"

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Xu, Liu-Jun, and Ji-Ping Huang. "Theory for Invisible Thermal Sensors: Monolayer Scheme." In Transformation Thermotics and Extended Theories. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-5908-0_11.

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AbstractIn this chapter, we propose an anisotropic monolayer scheme to prevent thermal sensors from distorting local and background temperature profiles, making them accurate and thermally invisible. We design metashells with anisotropic thermal conductivity and perform finite-element simulations in two or three dimensions for arbitrarily given thermal conductivity of sensors and backgrounds. We further experimentally fabricate a metashell with an anisotropic thermal conductivity based on the effective medium theory, which confirms the feasibility of our scheme. Our results are beneficial to i

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Hayat, Muhammad Aamer, and Yong Chen. "A Brief Review on Nano Phase Change Material-Based Polymer Encapsulation for Thermal Energy Storage Systems." In Springer Proceedings in Energy. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63916-7_3.

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AbstractIn recent years, considerable attention has been given to phase change materials (PCMs) that is suggested as a possible medium for thermal energy storage. PCM encapsulation technology is an efficient method of enhancing thermal conductivity and solving problems of corrosion and leakage during a charging process. Moreover, nanoencapsulation of phase change materials with polymer has several benefits as a thermal energy storage media, such as small-scale, high heat transfer efficiency and large specific surface area. However, the lower thermal conductivity (TC) of PCMs hinders the therma

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Schulz, B. "On the Effective Thermal Diffusivity of Macroscopic Heterogeneous Two Phase Materials." In Thermal Conductivity 18. Springer US, 1985. http://dx.doi.org/10.1007/978-1-4684-4916-7_4.

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Hagentoft, Carl-Eric, and Ali Naman Karim. "Mathematical Expressions for Prediction of the Effective Thermal Conductivity of Perfectly Packed Two-Phase Mixtures." In Proceedings of the 5th International Conference on Building Energy and Environment. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-9822-5_82.

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Gong, Lanxin, Changhong Peng, and Zhenze Zhang. "Study on Coupling Effect and Dynamic Behavior of Double Bubbles Rising Process." In Springer Proceedings in Physics. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_82.

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AbstractGas-liquid two-phase flow widely exists in nuclear energy engineering, in which bubble movement and deformation are critical problems. Because the activity of bubbles in the fluid is a very complex physical process, and the movement process is a flow field-bubble coupling process, which has strong nonlinearity and unsteady, the relevant research is usually based on experiments and simulation.We built a medium-sized experimental device to generate double bubbles with different sizes and characteristic numbers and recorded the motion trajectory with a high-speed camera. We developed and

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Qiu, Jun, and Xibo He. "Medium-High Temperature Composite Phase Change Materials Based on Porous Ceramics." In Energy Consumption, Conversion, Storage, and Efficiency [Working Title]. IntechOpen, 2024. http://dx.doi.org/10.5772/intechopen.114185.

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Medium-high temperature thermal energy storage usually uses composite phase change materials (CPCMs) composed of inorganic salts and porous skeletons, due to their high energy density, wide phase change temperature range, and stable physical/chemical properties. Inorganic salts provide enough heat storage capacity, and the porous skeleton is a stable packaging carrier that solves the low thermal conductivity and easy leakage of the former. Compared with alloy matrices, porous ceramics have higher corrosion resistance, economic benefits, and more stable thermal performance, which is more suitab

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"The Application of FlexPDE in Cavity Problems." In FlexPDE and Finite Element Method Applications in Thermal Energy Storage and Cavities. IGI Global, 2023. http://dx.doi.org/10.4018/979-8-3693-0932-2.ch005.

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Ways to improve heat transfer are of great interest due to wide applications. Nanofluid is one of the ways to increase heat transfer due to its higher thermal conductivity than normal fluid. Another way to increase heat transfer is to use a porous medium. The simultaneous use of these two methods causes a significant increase in heat transfer because the nanofluid increases the thermal conductivity and the porous medium of the contact surface. In fact, the porous medium is a material consisting of a solid network that is connected by empty spaces or pores between them, and these empty spaces a

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Yuki, Kazuhisa. "Heat Transfer Enhancement Using Unidirectional Porous Media under High Heat Flux Conditions." In Porous Fluids - Advances in Fluid Flow and Transport Phenomena in Porous Media. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96594.

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In this chapter, new heat transfer enhancement technologies with unidirectional porous metal called “EVAPORON” and “Lotus’ Breathing” are introduced to remove and manage heat from high heat flux equipment. The unidirectional porous metals introduced here can be easily fabricated by unique techniques such as mold casting technique, explosive welding technique, and 3D printing technique. First of all, many kinds of porous media, which have been introduced by the author so far as a heat transfer promoter, are compared each other to clarify what kind of porous metal is more suitable for high heat

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Pud, Alexander A., Nikolay A. Ogurtsov, and Olga S. Kruglyak. "Influence of dopant on the specific features of formation and properties of nanocomposites of poly(3-methylthiophene) with polyvinylidene fluoride." In NEW FUNCTIONAL SUBSTANCES AND MATERIALS FOR CHEMICAL ENGINEERING. PH “Akademperiodyka”, 2021. http://dx.doi.org/10.15407/akademperiodyka.444.159.

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The work is devoted to the development and study of conducting nanocomposites of poly(3-methylthiophene) (P3MT) and poly(vinylidene fluoride) (PVDF), suitable for changing properties when interaction with of the environment components, and to find factors of influence on properties of such materials. The kinetic aspects of P3MT formation in the process of 3-methylthiophene (3MT) polymerization in PVDF dispersions in the presence of dopants of different nature, in particular, chloride (Cl-), as well as surface-active dodecylbenzenesulfonate (DBS-) and perfluorooctanoate (PFO-) anions are studie

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Su, Chunming, Robert W. Puls, Thomas A. Krug, et al. "Long-Term Performance Evaluation of Groundwater Chlorinated Solvents Remediation Using Nanoscale Emulsified Zerovalent Iron at a Superfund Site." In Waste Management. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1210-4.ch061.

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This chapter addresses a case study of long-term assessment of a field application of environmental nanotechnology. Dense Non-Aqueous Phase Liquid (DNAPL) contaminants such as Tetrachloroethene (PCE) and Trichloroethene (TCE) are a type of recalcitrant compounds commonly found at contaminated sites. Recent research has focused on their remediation using environmental nanotechnology in which nanomaterials such as nanoscale Emulsified Zerovalent Iron (EZVI) are added to the subsurface environment to enhance contaminant degradation. Such nanoremediation approach may be mostly applicable to the so

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Conference papers on the topic "Thermal conductivity in a two-phase medium"

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Pandey, Hari, Xinyuan Du, Ethan Weems, et al. "Two-Phase Immersion Cooler for Medium-Voltage Silicon Carbide MOSFETs." In 2024 23rd IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm). IEEE, 2024. http://dx.doi.org/10.1109/itherm55375.2024.10709426.

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Sivasankaran, Harish, Yasuyuki Takata, and Masamichi Kohno. "Enhanced Thermal Transport of Nanostructured Phase Change Composite for Thermal Energy Storage." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36841.

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The power dissipation capacity of organic phase change materials (PCM) which is used for thermal energy storage applications is hindered by its low thermal conductivity. In this work we demonstrate that inclusion of few layer graphene nanoplatelets dramatically increase the thermal conductivity of the PCM upon solidification. The dramatic thermal conductivity increase stems from the fact that the graphene nanoplatelets are entrapped within the grain boundaries upon solidification of the crystalline structures thereby increasing the percolation pathways. We also show that the enhancement in the

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Eapen, Jacob. "Thermal Conduction Mechanism in Nanofluids, Solid Composites and Liquid Mixtures." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88236.

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Analysis of Maxwell’s mean-field (or effective-medium) theory reveals two limiting bounds — an upper and a lower bound — for thermal conductivity in binary composite systems. The lower and the upper bounds correspond to continuous conduction paths through the base medium and the dispersed medium, respectively (assuming that the dispersed medium has a higher thermal conductivity). Extensive comparisons to experimental data show that most of the reported thermal conductivity data on nanofluids, solid composites and liquid mixtures fall between the limiting Maxwell bounds. For a nanofluid, this i

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Iverson, Brian D., Joseph G. Cordaro, and Alan M. Kruizenga. "Thermal Property Testing of Nitrate Thermal Storage Salts in the Solid-Phase." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54159.

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Implementation of molten salt compounds as the heat transfer fluid and energy storage medium provides specific benefits to energy collection and conversion. Nitrate salts have been identified as a strong candidate for energy transfer and storage and have been demonstrated for use in these applications over time. As nitrate salts have solidification temperatures above ambient, concern for recovery from salt freezing events has instigated efforts to understand and predict this behavior. Accurate information of salt property behavior in the solid-phase is necessary for understanding recovery from

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Prasher, Ravi. "Modeling of Phonon Thermal Conductivity of Two Dimensional Nano and Micro Composites in the Longitudinal Direction." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72116.

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The three important length scales in composites made from nano/micro wires and fibers are: 1) the ratio of inter fiber distance and mean free path of the phonons in the host medium 2) the ratio of the diameter of the fiber or the wire and the mean free path of the phonons in the host medium and 3) the ratio of the diameter of the fiber and the mean free path of phonons in the fiber. Modeling of longitudinal thermal conductivity of two-dimensional nano and micro composites has not been attempted in the literature. This paper develops analytical modeling for the longitudinal thermal conductivity

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Krishnan, Shankar, Jayathi Y. Murthy, and Suresh V. Garimella. "A Two-Temperature Model for the Analysis of Passive Thermal Control Systems for Electronics." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33335.

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Passive control of unsteady thermal loads using phase change materials is being explored for a variety of military and consumer electronics applications. The phase change materials usually have very low thermal conductivity. To enhance the thermal response of the system, thermal conductivity enhancers like metal foams, internal fins and metal filler particles have been proposed. Local thermal equilibrium between the solid matrix and the fluid is not ensured in such systems since the thermal conductivities and heat capacities for the fluid and solid are very different. The use of a single volum

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Prasher, Ravi, and David Song. "Microscopic Effective Medium Model for Thermal Conductivity of Two Dimensional Nano-Porous and Micro-Porous Media." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72115.

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Two-dimensional Nano-porous (NP) and micro-porous (MP) materials are currently used in a variety of applications which require the knowledge of the thermal conductivity (k). In NP and MP materials, two pertinent length scales determine the phonon thermal conductivity: 1) the ratio of inter-pore distance, δ, and the mean free path (m.f.p.) of phonons, 1, 2) the ratio of the pore diameter, d, and the m.f.p. of phonons. This is schematically shown in Fig. 1. In the traditional diffusion-approximation (macroscopic models) based models (1 ≪ d, δ) for the thermal conductivity of porous materials, th

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Kim, Seo Young, and Andrey V. Kuznetsov. "Optimization of Pin-Fin Heat Sinks Using the Two Medium Anisotropic Porous Model." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33786.

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A numerical study has been carried out to optimize the thermal performance of a pin-fin heat sink. A pin-fin heat sink placed horizontally in a channel is modeled as a hydraulically and thermally anisotropic porous medium. A uniform heat flux is prescribed at the bottom of the heat sink. Cold air is supplied from the top opening of the channel and exhausts to the channel outlet. Comprehensive numerical solutions are derived from the governing Navier-Stokes and energy equations, using the Brinkman-Forchheimer extended Darcy model and the local thermal non-equilibrium (LTNE) model for the region

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Hays, A., E. Borquist, D. Bailey, D. Wood, and L. Weiss. "Small-Scale Thermal Energy Storage With Capillary Conductivity Enhancement." In ASME 2016 10th International Conference on Energy Sustainability collocated with the ASME 2016 Power Conference and the ASME 2016 14th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/es2016-59582.

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Thermal energy is a leading topic of discussion in energy conservation and environmental fields. Specifically for large-scale applications solar energy and concentrated solar power (CSP) systems use techniques that include thermal energy storage systems and phase change materials to harvest energy. However, on the smaller centimeter scale, there have been historically fewer investigations of these same techniques. The main goal of this paper is to investigate thermal energy storage (TES) as applied to a small scale system for thermal energy capture. Typical large-scale TES consists of a phase

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Lalanne, Philippe. "Effective medium theory of symmetric two-dimensional subwavelength periodic structures." In Diffractive Optics and Micro-Optics. Optica Publishing Group, 1996. http://dx.doi.org/10.1364/domo.1996.jtub.19.

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Abstract:

Recent experimental and theoretical investigations have shown that periodic subwavelength structured surfaces with periods small compared to the illumination wavelength behave as homogeneous medium, and have suggested interesting applications, such as fabrication of anti-reflection coatings1,2,3, quarter wave plates4, polarizers5, and graded-phase diffractive elements6. The replacement of the periodic structure by a homogeneous medium is often referred as homogenization or effective medium theory (EMT). EMT can be applied to a large variety of physical material properties, such as diffusion co

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