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Dissertations / Theses on the topic 'Thermal conductivity measurements'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Dougherty, Brian P. "An automated probe for thermal conductivity measurements." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/101183.

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A transient technique was validated for making thermal conductivity measurements. The technique incorporated a small, effectively spherical, heat source and temperature sensing probe. The actual thermal conductivity measurements lasted 30 seconds. After approximately 15 minutes of data reduction, a value for thermal conductivity was obtained. The probe yielded local thermal conductivity measurements. Spherical sample volumes less than 8 cm² were required for the materials tested. Thermal conductivity (and moisture) distributions can be measured for relatively dry or wetted samples. The techn

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2

Mathis, Nancy Elaine. "Measurements of thermal conductivity anisotropy in polymer materials." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ62173.pdf.

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3

Rees, Mary Frances. "Thermal conductivity measurements on high Tâ†c superconductors." Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317234.

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4

Madrid, Lozano Francesc. "Thermal Conductivity and Specific Heat Measurements for Power Electronics Packaging Materials. Effective Thermal Conductivity Steady State and Transient Thermal Parameter Identification Methods." Doctoral thesis, Universitat Autònoma de Barcelona, 2005. http://hdl.handle.net/10803/5348.

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5

Martin, Ana Isabel. "Hydrate Bearing Sediments-Thermal Conductivity." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6844.

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The thermal properties of hydrate bearing sediments remain poorly studied, in part due to measurement difficulties inside the hydrate stability envelope. In particular, there is a dearth of experimental data on hydrate-bearing sediments, and most available measurements and models correspond to bulk gas hydrates. However, hydrates in nature largely occur in porous media, e.g. sand, silt and clay. The purpose of this research is to determine the thermal properties of hydrate-bearing sediments under laboratory conditions, for a wide range of soils from coarse-grained sand to fine-grained silica f

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6

Kalkundri, Kaustubh. "Development and verification of an apparatus for thermal resistance and thermal conductivity measurements." Diss., Online access via UMI:, 2006.

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7

Tsai, Andy 1969. "Investigation of variability in skin tissue intrinsic thermal conductivity measurements." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36036.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.<br>Vita.<br>Includes bibliographical references (leaves 75-76).<br>by Andy Tsai.<br>M.S.

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8

Shaikh, Samina. "Effective thermal conductivity measurements relevant to deep borehole nuclear waste disposal." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41301.

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Thesis (S.M. and S.B.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2007.<br>Includes bibliographical references (leaves 106-107).<br>The objective of this work was to measure the effective thermal conductivity of a number of materials (particle beds, and fluids) proposed for use in and around canisters for disposal of high level nuclear waste in deep boreholes. This information is required to insure that waste temperatures will not exceed tolerable limits. Such experimental verification is essential because analytical models and empirical correlations can

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9

Ma, Luyao. "Optimization of experimental conditions of hot wire method in thermal conductivity measurements." Thesis, KTH, Materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93765.

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This work studied the hot wire method in measuring thermal conductivity at room temperature. The purpose is to find the optimized experimental conditions to minimize natural convection in liquid for this method, which will be taken as reference for high temperature thermal conductivity measurement of slag. Combining room temperature experiments and simulation with COMSOL Multiphysics 4.2a, the study on different experimental parameters which may influence the accuracy of the measured thermal conductivity was conducted. The parameters studied were the diameter of crucible, the position of wire

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10

Arnold, David Feversham. "Thermal conductivity measurements of semi-crystalline silica using a modified comparative method." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ39631.pdf.

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11

Bogner, Manuel. "Thermal conductivity measurements of thin films using a novel 3 omega method." Thesis, Northumbria University, 2017. http://nrl.northumbria.ac.uk/36186/.

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For most micro- and nanoelectronic devices based on thin films applied for effective heat dissipation and thermoelectric devices for energy harvesting, thermal management is a critical subject for their device performance and reliability. This thesis focuses on the investigation of the cross- and in-plane thermal conductivities of both high- and low-thermal conductive thin film materials. Aluminum nitride (AlN), with its high thermal conductivity, has been studied, as it is a promising candidate for effective heat conductors in microelectronic devices. Copper iodide (CuI) has also been investi

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12

Cho, Chun Hyung. "Heat transfer in nuclear fuels : measurements of gap conductance /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p3144408.

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13

deMartin, Brian J. "Laboratory measurements of the thermal conductivity and thermal diffusivity of methane hydrate at simulated in situ conditions." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/26216.

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14

Vieyra, Villegas Hugo Abdiel. "Resistivity and thermal conductivity measurements on heavy-fermion superconductors in rotating magnetic fields." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-107550.

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CeCu_2Si_2 was the first heavy-fermion compound showing signatures of bulk superconductivity (T_c = 0.5 K). Further observations have put in evidence the correlations between superconductivity, magnetic order, Kondo physics, and quantum critical phenomena. In spite of the interest generated, a systematic study of such correlations was hampered by strong sample dependences. Fortunately, the inherent complexity associated to the stoichiometric composition has been recently understood. The availability of single-crystals with well-defined properties has thus reignited the interest in CeCu_2Si_2

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15

Alotaibi, Moteb. "Modeling and Evaluating the Thermal Conductivity of Porous Thermal Barrier Coatings at Elevated Temperatures for Industrial Applications." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39522.

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The thermal conductivity of various porous thermal barrier coating (TBC) systems used in elevated temperature for industrial applications has been evaluated using a proposed six-phase model. These porous TBC systems rely on microstructural properties and yield different types of porosity. These microstructural properties can influence the thermal conductivity of TBC systems. The purpose of this thesis is to assess the thermal conductivity of TBC systems based on microstructural attributes, particularly the effect of different types of porosity. Thus, the first component of this thesis investig

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16

Albert, Rene [Verfasser], and Hartmut [Akademischer Betreuer] Wiggers. "Thermal Conductivity Measurements of Metal Hydrides as High Temperature Heat Storage Materials under Operating Conditions / Rene Albert ; Betreuer: Wiggers Hartmut." Duisburg, 2020. http://d-nb.info/1204826714/34.

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17

Stöhr, Adriana. "Thermal textile pixels : Out-of-plane and in-plane heat transfer measurements of knitted textiles." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-22178.

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The human body possesses a highly developed range of senses that help orienting oneself in everyday life. Especially when it comes to navigating, perceiving and reacting to the world around us, people tend to rely mostly on their vision and hearing. Suffering from an impairment of either one, or both of the predominating senses means having to counterbalance this constraint. People suffering from blindness and deaf-blindness compensate their impairment mainly by relying on their haptic perception. In this case, information is usually communicated by braille or vibrotactile means. To offer anot

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18

Vieyra, Villegas Hugo Abdiel [Verfasser], Frank [Akademischer Betreuer] Steglich, and Joachim [Akademischer Betreuer] Wosnitza. "Resistivity and thermal conductivity measurements on heavy-fermion superconductors in rotating magnetic fields / Hugo Abdiel Vieyra Villegas. Gutachter: Frank Steglich ; Joachim Wosnitza. Betreuer: Frank Steglich." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://d-nb.info/1068151706/34.

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19

Balog, Paul S. "High pressure and temperature electrical resistivity measurements of HCP transition metals Ti, Zr and Gd and the potential anisotropy of thermal conductivity of the inner core of the Earth." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0006/MQ30777.pdf.

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20

Cherief, Wahid. "Etude des ferrofluides et de leurs applications à l'intensification des transferts de chaleur par convection forcée." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT102/document.

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Cette thèse a pour objectif d’étudier les performances thermiques et rhéologiques des ferrofluides sous champ magnétique pour des applications de refroidissement. L’approche adoptée dans cette thèse est de nature macroscopique, et est basée sur plusieurs études expérimentales. Cette caractérisation des performances des ferrofluides est focalisée sur trois aspects : i) étude de la rhéologie ii) étude de la convection forcée iii) étude la conductivité thermique. Différents outils de caractérisation correspondant à chaque domaine d’étude ont été développés. Dans le domaine de la rhéologie, une ce

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21

Jensen, Colby. "TRISO Fuel Thermal Conductivity Measurement Instrument Development." DigitalCommons@USU, 2010. https://digitalcommons.usu.edu/etd/838.

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Thermal conductivity is an important thermophysical property needed for effectively predicting fuel performance. As part of the Next Generation Nuclear Plant (NGNP) program, the thermal conductivity of tri-isotropic (TRISO) fuel needs to be measured over a temperature range characteristic of its usage. The composite nature of TRISO fuel requires that measurement be performed over the entire length of the compact in a non-destructive manner. No existing measurement system is capable of performing such a measurement. A measurement system has been designed based on the steady-state, guarded-comp

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22

Hua, Zilong. "Hybrid Photothermal Technique for Microscale Thermal Conductivity Measurement." DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/1491.

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Most existing thermal conductivity measurement techniques of nuclear fuel only measure the overall effective thermal conductivity of the fuel, cladding, and gap, with low spatial-resolution. However, damage to nuclear fuel microstructure caused by neutron-irradiation can result in sharp, local changes of thermal conductivity. Additionally, extremely large temperature-gradients (~1600 K/cm) from the fuel centerline to the coolant result in similar gradients of thermal conductivity. Therefore, in pursuit of greater understanding of nuclear fuel performance, the objective of this study was to dev

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23

Nocentini, Kévin. "Comportement thermo-hygrique de blankets aérogels de silice et applications à l’isolation des bâtiments." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEM049/document.

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En Europe, le secteur du bâtiment est le plus énergivore et représente environ 40 % de l’énergie totale consommée. A court terme, la façon la plus efficace de baisser cette consommation est de réduire les déperditions thermiques à travers l’enveloppe du bâtiment en augmentant son isolation thermique, tout en minimisant la perte de surface habitable. Dans ce contexte, les travaux de thèse portent sur l’étude et la mise au point pour pré-industrialisation de matériaux super-isolants composites à base d'aérogel de silice. Le matériau composite étudié fait partie de la famille des blankets aérogel

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24

Faghani, Farshad. "Thermal conductivity Measurement of PEDOT:PSS by 3-omega Technique." Thesis, Linköpings universitet, Fysik och elektroteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-63317.

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Conducting polymers (CP) have received great attention in both academic and industrial areas in recent years. They exhibit unique characteristics (electrical conductivity, solution processability, light weight and flexibility) which make them promising candidates for being used in many electronic applications. Recently, there is a renewed interest to consider those materials for thermoelectric generators that is for energy harvesting purposes. Therefore, it is of great importance to have in depth understanding of their thermal and electrical characteristics. In this diploma work, the thermal c

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25

Fox, Brandon S. "In-Pile Thermal Conductivity Measurement Methods for Nuclear Fuels." DigitalCommons@USU, 2010. https://digitalcommons.usu.edu/etd/660.

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Measuring nuclear fuel thermal conductivity in-pile can provide much needed data for understanding fuel performance during irradiation and yield thermophysical property data needed for simulation codes and fuel databases. The objective of this research is to develop and compare two in-pile thermal conductivity methods in a laboratory setting using surrogate fuel materials. A steady-state radial heat flow method was investigated to understand its viability as an in-pile steady-state thermal conductivity technique. By using Joule heating to simulate volumetric heat generation within a surrogate

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26

Radhakrishnan, Arjun. "Thermal conductivity measurement of gas diffusion layer used in PEMFC /." Online version of thesis, 2009. http://hdl.handle.net/1850/10839.

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27

Kwiecinski, Przemyslaw Mark. "Non contact all optical thermal conductivity measurement utilizing Raman spectroscopy." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27260.

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Original experimental data for the temperature dependence of the Raman shift in silicon and gallium sulfide is presented. An all optical thermal conductivity method, using an equation presented by Perichon et a1.2 and Nonnenmacher et al. 23, is applied to silicon and gallium sulfide. Theoretical calculations by Moody et al.20 and Nissam et al. 22 are compared to the experimental results of Perichon et al. for the first time. The thermal conductivity of silicon is measured at 23°C, 200°C, and 300°C, and of gallium sulfide at 23°C. We investigate the possibility of measuring th

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28

Folsom, Charles P. "Effective Thermal Conductivity of Tri-Isotropic (TRISO) Fuel Compacts." DigitalCommons@USU, 2012. https://digitalcommons.usu.edu/etd/1448.

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Thermal conductivity is an important thermophysical property needed for effectively predicting nuclear fuel performance. As part of the Next Generation Nuclear Plant (NGNP) program, the thermal conductivity of tri-isotropic (TRISO) fuel needs to be measured over a temperature range characteristic of its usage. The composite nature of TRISO fuel requires that measurement be performed over the entire length of the compact in a non-destructive manner. No existing measurement system is capable of performing such a measurement. A measurement system has been designed based on the steady-state, guard

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29

Chemminian, Rakhith. "Thermal Conductivity Measurement of Dry and Intermediate Moisture Porous Food Materials." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1394718856.

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30

Shrestha, Ramesh. "High-Precision Micropipette Thermal Sensor for Measurement of Thermal Conductivity of Carbon Nanotubes Thin Film." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc103393/.

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The thesis describes novel glass micropipette thermal sensor fabricated in cost-effective manner and thermal conductivity measurement of carbon nanotubes (CNT) thin film using the developed sensor. Various micrometer-sized sensors, which range from 2 µm to 30 µm, were produced and tested. The capability of the sensor in measuring thermal fluctuation at micro level with an estimated resolution of ±0.002oC is demonstrated. The sensitivity of sensors was recorded from 3.34 to 8.86 µV/oC, which is independent of tip size and dependent on the coating of Nickel. The detailed experimental setup for t

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31

Rowan, Linda. "The measurement of the thermal conductivity of gaseous mixture using the transient hot wire technique." Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252676.

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32

de, Koninck David Andrew. "Thermal conductivity measurement using the 3-omega technique: applications to power harvesting microsystems." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22039.

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The optimal design of power generating microsystems requires accurate knowledge of the thermal properties of their constituent materials at the appropriate length scale. The goal of this thesis was to build an apparatus for measuring the thermal conductivity of thermally-insulating dielectric materials using the so-called 3-omega technique. This technique utilizes a microfabricated metal line deposited on the specimen to act as a resistive heater. When an alternating current (AC) voltage signal is used to excite the heater at a frequency ω, the periodic heating generates oscillations in the el

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33

Karami, Peyman. "Robust and Durable Vacuum Insulation Technology for Buildings." Doctoral thesis, KTH, Byggnadsteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-176494.

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Today’s buildings are responsible for 40% of the world’s energy use and also a substantial share of the Global Warming Potential (GWP). In Sweden, about 21% of the energy use can be related to the heat losses through the climatic envelope. The “Million Program” (Swedish: Miljonprogrammet) is a common name for about one million housing units, erected between 1965 and 1974 and many of these buildings suffer from poor energy performance. An important aim of this study was to access the possibilities of using Vacuum Insulation Panels (VIPs) in buildings with emphasis on the use of VIPs for improvi

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34

Hartvigsen, Peter Ward. "Thermal Conductivity and Diffusivity Measurement Assessment for Nuclear Materials Raman Thermometry for Uranium Dioxide and Needle Probe for Molten Salts." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8622.

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In the near future, Gen II, III, and IV nuclear reactors will be in operation. UO2 is a common fuel for reactors in each of these generations and molten salts are used as coolant/fuel in Gen IV molten salt reactors. This thesis investigates potential ways to measure thermal conductivity for these materials: Raman thermometry for UO2 and a needle probe for molten salts. Four Raman thermometry techniques are investigated in this thesis: The Two Laser Raman (TLR), Time Differential Domain Raman (TDDR), Frequency Resolved Raman (FRR), and Frequency Domain Raman (FDR). The TLR is a steady state met

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35

van, Gelder Maarten F. "A Thermistor Based Method for Measurement of Thermal Conductivity and Thermal Diffusivity of Moist Food Materials at High Temperatures." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30286.

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The purpose of this research was to assess the suitability of the thermistor based method for measuring thermal conductivity and diffusivity of moist food materials at high temperatures. Research focused on aspects of calibration, thermal contact in solid food materials, natural convection in liquid media and the performance in moist food materials at high temperatures. Thermistor probes were constructed in house and calibrated in three materials of known thermal conductivity and diffusivity, water, glycerol, and a heat transfer fluid, HTF 500. With few exceptions, the calibrated probe esti

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36

Cruz, Carolina Abs da. "Termo-refletância transiente: implementação, modelamento e aplicação a filmes." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2008. http://hdl.handle.net/10183/16771.

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Este trabalho apresenta uma revisão de técnicas para medir propriedades térmicas de lmes, seguida de enfoque na termo-re etância transiente (TTR). Dentre as tecnologias existentes para medir propriedades térmicas, métodos ópticos são preferidos devido à sua natureza não-destrutiva, potencial de alta resolução temporal e espacial e calibração independente de contato físico. A implementação experimental deste método é apresentada, assim como a teoria da linha de transmissão utilizada para tratamento por Transformada de Laplace da equação de Fourier unidimensional do calor. Para facilitar o cálcu

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37

Munro, Troy Robert. "Thermal Property Measurement of Thin Fibers by Complementary Methods." DigitalCommons@USU, 2016. https://digitalcommons.usu.edu/etd/4702.

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To improve measurement reliability and repeatability and resolve the orders of magnitude discrepancy between the two different measurements (via reduced model transient electrothermal and lock-in IR thermography), this dissertation details the development of three complementary methods to accurately measure the thermal properties of the natural and synthetic Nephila (N.) clavipes spider dragline fibers. The thermal conductivity and diffusivity of the dragline silk of the N. clavipes spider has been characterized by one research group to be 151-416 W m−1 K −1 and 6.4-12.3 ×10−5 m2 s −1 , respec

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38

Gurrum, Siva P. "Thermal Modeling and Characterization of Nanoscale Metallic Interconnects." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10435.

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Temperature rise due to Joule heating of on-chip interconnects can severely affect performance and reliability of next generation microprocessors. Thermal predictions become difficult due to large number of features, and the impact of electron size effects on electrical and thermal transport. It is thus necessary to develop efficient numerical approaches, and accurate metal and dielectric thermal characterization techniques. In this research, analytical, numerical, and experimental techniques were developed to enable accurate and efficient predictions of interconnect temperature rise. A finite

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39

Smith, Andrew Paul. "Application of flash methods to measurement of the thermal conductivity of heterogeneous and non-planar materials." Thesis, University of Salford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261989.

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40

Harris, Kurt E. "Characterization of Carbon Nanostructured Composite Film Using Photothermal Measurement Technique." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/6931.

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Graphene is a form of carbon with unique thermal and structural properties, giving it high potential in many applications, from electronics to driveway heating. Advanced fabrication techniques putting small, graphene-like structures in a polymer matrix could allow for incorporation of some of the benefits of graphene into very lightweight materials, and allow for broader commercialization. Measuring the thermal properties of these thin-film samples is a technical capability in need of development for use with the specific specimens used in this study. Relating those thermal properties to the m

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Choo, Hyunwook. "Engineering behavior and characterization of physical-chemical particulate mixtures using geophysical measurement techniques." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52178.

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Natural geomaterials exhibit a wide range in size, physical properties, chemical properties, and mechanical behaviors. Soils that are composed of mixtures of particles with different physical and chemical properties pose a challenge to characterization and quantification of the engineering properties. This study examined the behavior of particulate mixtures composed of differently sized silica particles, mixtures composed of aluminosilicate and organic carbon particles, and mixtures composed of particles with approximately three orders of magnitude difference in particle size. This experimenta

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Park, Jungkyu. "THERMAL TRANSPORT IN NOVEL THREE DIMENSIONAL CARBON NANOSTRUCTURES." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1455101197.

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43

Al-Khudary, Nadine. "Material thermal conductivity measurement by the 3-omega method : application to polymers characterization using inkjet printing technology." Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10135/document.

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Dans le domaine de l'électronique souple, les substrats flexibles à base de polymères sont de plus en plus utilisés. Si dans les prochaines années, les structures de propagation mises en œuvre sur ce type de substrat véhiculent une puissance, alors la connaissance de la conductivité thermique de ces matériaux est essentielle. Dans ce travail, nous mesurons la conductivité thermique de matériaux de type polymère en utilisant la méthode 3 omégas. Des mesures ont été effectuées sur du polydiméthylsiloxane (PDMS). Un procédé technologique particulier est utilisé pour la fabrication des échantillon

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44

Khatun, Ayesha. "Assessment of the impact of the measurement precision of thermal properties of materials on the prediction of their thermal behaviour." Mémoire, Université de Sherbrooke, 2010. http://hdl.handle.net/11143/5950.

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Résumé : Les propriétés thermiques des matériaux utilisées pour la construction des murs latéraux d’une cuve d’électrolyse de l’aluminium captent l’attention depuis les deux dernières décennies. Une bonne prédiction du comportement thermique dynamique des cellues Hall-Heroult, y compris une estimation précise des pertes d'énergie et de l'emplacement du gel sur le coté, est rendue possible lorsque les matériaux de coté sont bien caractérisés en fonction de la température. L'objectif de ce travail consiste à mesurer la diffusivité thermique, la capacité calorifique et la conductivité thermique d

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45

Koppanooru, Sampat Kumar Reddy. "Estimating Thermal Conductivity and Volumetric Specific Heat of a Functionally Graded Material using Photothermal Radiometry." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1062896/.

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Functionally graded materials (FGMs) are inhomogeneous materials in which the material properties vary with respect to space. Research has been done by scientific community in developing techniques like photothermal radiometry (PTR) to measure the thermal conductivity and volumetric heat capacity of FGMs. One of the problems involved in the technique is to solve the inverse problem, i.e., estimating the thermal properties after the frequency scan has been obtained. The present work involves finding the unknown thermal conductivity and volumetric heat capacity of the FGMs by using finite volume

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46

Christopher, Michael Donald. "Application of the Transient Hot-Wire Technique for Measurement of Effective Thermal Conductivity of Catalyzed Sodium Alanate for Hydrogen Storage." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/32955.

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Sodium alanate, or the Na-Al-H system, has been the focus of intense research over the past decade due to its ability to hold almost 5 wt% of hydrogen. In this research, the effective thermal conductivity, k, of a sample of titanium-doped sodium alanate is studied over a range of operating conditions pertinent to practical on-board hydrogen storage. A transient technique employing a platinum hot-wire is used to make the measurements. A cylindrical experimental apparatus was designed with the aide of a finite element model that was used to quantify the cylinder boundary effects. The apparat

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47

Gaspar, Jonathan. "Fluxmétrie et caractérisation thermiques instationnaires des dépôts des composants face au plasma du Tokamak JET par techniques inverses." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4739/document.

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Ces travaux portent sur la résolution successive de deux problèmes inverses en transferts thermiques : l'estimation de la densité de flux en surface d'un matériau puis de la conductivité thermique équivalente d'une couche déposée en surface de ce matériau. Le modèle direct est bidimensionnel orthotrope (géométrie réelle d'un matériau composite), instationnaire, non-linéaire et ses équations sont résolues par éléments finis. Les matériaux étudiés sont les composants face au plasma (tuiles composite carbone-carbone) dans le Tokamak JET. La densité de flux recherchée varie avec une dimension spat

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48

Beltrán, Pitarch Braulio. "Advanced characterization of thermoelectric materials and devices by impedance spectroscopy." Doctoral thesis, Universitat Jaume I, 2020. http://hdl.handle.net/10803/670007.

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Els dispositius termoelèctrics (TEs) poden convertir directament calor en electricitat o usar electricitat per crear una diferència de temperatura, no obstant això, actualment no estan molt estesos a causa de la seua baixa eficiència. El desenvolupament de nous materials més eficients es basa típicament en l'optimització de la figura de mèrit adimensional, que està determinada per tres propietats del material: el coeficient Seebeck (S), la conductivitat elèctrica (σ) i la conductivitat tèrmica (λ), i també la temperatura (T). Per tant, la determinació d'aquestes propietats en funció de la temp

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Thuau, Damien. "Fabrication and characterisation of carbon-based devices." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/5879.

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Thin film material properties and measurement characterisation techniques are crucial for the development of micro-electromechanical systems (MEMS) devices. Furthermore, as the technology scales down from microtechnology towards nanotechnology, nanoscale materials such as carbon nanotubes (CNTs) are required in electronic devices to overcome the limitations encountered by conventional materials at the nanoscale. The integration of CNTs into micro-electronics and material applications is expected to provide a wide range of new applications. The work presented in this thesis has contributed to t

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Islam, Arnob. "BLACK PHOSPHORUS NANOSCALE DEVICES AND EMERGING APPLICATIONS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1568124549519621.

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