Thermal Conductivity Measurements of Silicon from 30° to 425°C

Morris, Robert G.; Hust, J. G.

doi:10.1103/physrev.124.1426

Cited by 41 publications

(8 citation statements)

References 23 publications

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“…The measured thermal conductivities for glass slide and silicon are 1.48 W/m-K and 144 W/m-K respectively. They agree well with reported values (50)(51) and thus validate our measurement systems. The measurement accuracy is expected even higher for graphene composites since they typically have thermal conductivity around 1 W/m-K. Figure 3.…”

Section: Methods Of 3ω Measurement Of Thermal Conductivitysupporting

confidence: 92%

(Invited) Thermal Transport in Graphene and Graphene-based Composites

Park

Ruan

et al. 2013

ECS Trans.

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We theoretically and experimentally studied the thermal transport properties in various graphene-based systems. Firstly, we review our previous works of molecular dynamics simulations to study the thermal transport in graphene nanoribbons (GNRs). We also studied negative differential thermal conductance (NDTC) at large temperature biases in GNRs. We extended our study of NDTC in the diffusive limit into general one-dimensional thermal transport and found that NDTC is possible if thermal junctions are introduced. These findings are useful for future applications of controlling heat at nanoscale. Secondly, we describe our experimental work of synthesized graphene-based composites with fillers of reduced graphene oxide and polymers. We used 3ω method to measure the thermal conductivity and found that the thermal conductivity can be tuned dramatically by the graphene filler concentration. Graphene-based composites are potentially promising as thermal interface materials, which have become increasingly important in modern heat management in many industrial applications.

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Section: Methods Of 3ω Measurement Of Thermal Conductivitysupporting

confidence: 92%

(Invited) Thermal Transport in Graphene and Graphene-based Composites

Park

Ruan

et al. 2013

ECS Trans.

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“…Furthermore, due to the small size of the sample and the desired temperature range for measurement, the comparative axial heat flow technique was selected. The comparative axial heat flow method has been used since the 1930s [22] and was more completely studied and developed in the 1950s and 1960s by Ballard et al [23], Morris and Hust [24], Francl and Kingery [25], and Mirkovich [26], among others. Laubitz [27] questioned the claimed accuracy of such measurements, but later studies performed by Sweet et al [28,29] and Pillai and George [30] reported uncertainties independent of the uncertainty of the reference sample, to be better than 5 %.…”

Section: Triso Fuel Effective Thermal-conductivity Measurementmentioning

confidence: 99%

Design and Validation of a High-Temperature Comparative Thermal-Conductivity Measurement System

et al. 2012

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A measurement system has been designed and built for the specific application of measuring the effective thermal conductivity of a composite, nuclear-fuel compact (small cylinder) over a temperature range of 100 • C to 800 • C. Because of the composite nature of the sample as well as the need to measure samples pre-and postirradiation, measurement must be performed on the whole compact non-destructively. No existing measurement system is capable of obtaining its thermal conductivity in a non-destructive manner. The designed apparatus is an adaptation of the guardedcomparative-longitudinal heat flow technique. The system uniquely demonstrates the use of a radiative heat sink to provide cooling which greatly simplifies the design and setup of such high-temperature systems. The design was aimed to measure thermalconductivity values covering the expected range of effective thermal conductivity of the composite nuclear fuel from 10 W · m −1 · K −1 to 70 W · m −1 · K −1 . Several materials having thermal conductivities covering this expected range have been measured for system validation, and results are presented. A comparison of the results has been made to data from existing literature. Additionally, an uncertainty analysis is presented finding an overall uncertainty in sample thermal conductivity to be 6 %, matching well with the results of the validation samples.

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“…To measure the ETC of the TRISO fuel compacts, a system was developed based on the guarded-comparative-heat-flow technique with a calculated/validated uncertainty of less than 6% for sample thermal conductivity from 3-80 W m À1 K À1 over a measurement temperature range of 100-800°C [26][27][28][29][30].…”

Section: Etc Measurementmentioning

confidence: 99%

Experimental measurement and numerical modeling of the effective thermal conductivity of TRISO fuel compacts

Folsom

Xing

Jensen

et al. 2015

Journal of Nuclear Materials

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h i g h l i g h t sMeasured the ETC of surrogate TRISO fuel compacts experimentally and numerically. The ETC of the surrogate fuel compacts varies between 50 and 30 W m À1 K À1 . A new model/approach to analyze the effect of constituent materials on ETC is proposed. a b s t r a c t Accurate modeling capability of thermal conductivity of tristructural-isotropic (TRISO) fuel compacts is important to fuel performance modeling and safety of Generation IV reactors. To date, the effective thermal conductivity (ETC) of TRISO fuel compacts has not been measured directly. The composite fuel is a complicated structure comprised of layered particles in a graphite matrix. In this work, finite element modeling is used to validate an analytic ETC model for application to the composite fuel material for particle-volume fractions up to 40%. The effect of each individual layer of a TRISO particle is analyzed showing that the overall ETC of the compact is most sensitive to the outer layer constituent. In conjunction with the modeling results, the thermal conductivity of matrix-graphite compacts and the ETC of surrogate TRISO fuel compacts have been successfully measured using a previously developed measurement system. The ETC of the surrogate fuel compacts varies between 50 and 30 W m À1 K À1 over a temperature range of 50-600°C. As a result of the numerical modeling and experimental measurements of the fuel compacts, a new model and approach for analyzing the effect of compact constituent materials on ETC is proposed that can estimate the fuel compact ETC with approximately 15-20% more accuracy than the old method. Using the ETC model with measured thermal conductivity of the graphite matrix-only material indicate that, in the composite form, the matrix material has a much greater thermal conductivity, which is attributed to the high anisotropy of graphite thermal conductivity. Therefore, simpler measurements of individual TRISO compact constituents combined with an analytic ETC model, will not provide accurate predictions of overall ETC of the compacts emphasizing the need for measurements of composite, surrogate compacts.

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Thermal Conductivity Measurements of Silicon from 30° to 425°C

Cited by 41 publications

References 23 publications

(Invited) Thermal Transport in Graphene and Graphene-based Composites

(Invited) Thermal Transport in Graphene and Graphene-based Composites

Design and Validation of a High-Temperature Comparative Thermal-Conductivity Measurement System

Experimental measurement and numerical modeling of the effective thermal conductivity of TRISO fuel compacts

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