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Material Properties of Thermoelectri...

Hollar, Courtney.

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Material Properties of Thermoelectric and Nuclear Energy Sources.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Material Properties of Thermoelectric and Nuclear Energy Sources./
Author:	Hollar, Courtney.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	150 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-02, Section: B.
Contained By:	Dissertations Abstracts International81-02B.
Subject:	Mechanical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13808929
ISBN:	9781085592246

Material Properties of Thermoelectric and Nuclear Energy Sources.
Hollar, Courtney.

Material Properties of Thermoelectric and Nuclear Energy Sources. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 150 p.

Source: Dissertations Abstracts International, Volume: 81-02, Section: B.

Thesis (Ph.D.)--University of Idaho, 2019.

This item must not be sold to any third party vendors.

Thermoelectric generators are a reliable solid-state energy conversion technology. Furthermore, flexible thermoelectric generators are especially of interest due to their potential to power flexible electronics and sensors using body heat or other ambient heat sources. This research focuses on developing flexible, bismuth telluride thin films utilizing a low-cost and scalable wet chemistry method. An overview of current alternative small energy sources demonstrates the need for flexible thermoelectric generators. Thin films fabricated from bismuth telluride nanocrystals exhibited a peak power factor of 0.35 mW/m∙K2 at 433 K, which is among the highest reported values for flexible thermoelectric films. In addition, the change in electrical resistance was 23% after 1000 bending cycles.Nuclear energy is a large scale energy alternative to fossil fuels which generate minimal environmental emissions. However, the thermal conductivity of nuclear fuel is necessary due to its impact on fuel temperature, the resulting reactor performance, and safety considerations. This research works to overcome this problem by utilizing an in-pile thermal conductivity measurement in order to determine the thermal conductivity under prototypic conditions over a range of burnup. A multilayer quadrupoles analytic model is developed to describe the transient thermal interactions between a line heat source and nuclear fuel for in-pile thermal conductivity measurements. The analytic model was verified using a finite element analysis. Ultimately, the analytic model was used to perform parameter and sensitivity studies to explore the viability of accurately measuring the sample thermal conductivity under various measurement conditions. The analytic model was then compared to experimental measurements of polytetrafluoroethylene and stainless steel 304, which showed good agreement. Using the analytic model, optimization of the needle probe was then performed in order to improve the accuracy of thermal conductivity measurements for UO2 related to the fuel diameters, various probe diameters, and thermal contact resistance. The standard equation for data reduction using the slope to determine the thermal conductivity is not capable of measuring samples with prototypic diameters. However, the validated analytic model provides the foundation to elucidate a better understanding of in-pile thermal conductivity measurements in samples with a diameter as low as 10 mm.

ISBN: 9781085592246Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

Thermoelectric generators

Material Properties of Thermoelectric and Nuclear Energy Sources.
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020 $a 9781085592246
035 $a (MiAaPQ)AAI13808929
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245 1 0 $a Material Properties of Thermoelectric and Nuclear Energy Sources.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 150 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-02, Section: B.
500 $a Advisor: Budwig, Ralph.
502 $a Thesis (Ph.D.)--University of Idaho, 2019.
506 $a This item must not be sold to any third party vendors.
520 $a Thermoelectric generators are a reliable solid-state energy conversion technology. Furthermore, flexible thermoelectric generators are especially of interest due to their potential to power flexible electronics and sensors using body heat or other ambient heat sources. This research focuses on developing flexible, bismuth telluride thin films utilizing a low-cost and scalable wet chemistry method. An overview of current alternative small energy sources demonstrates the need for flexible thermoelectric generators. Thin films fabricated from bismuth telluride nanocrystals exhibited a peak power factor of 0.35 mW/m∙K2 at 433 K, which is among the highest reported values for flexible thermoelectric films. In addition, the change in electrical resistance was 23% after 1000 bending cycles.Nuclear energy is a large scale energy alternative to fossil fuels which generate minimal environmental emissions. However, the thermal conductivity of nuclear fuel is necessary due to its impact on fuel temperature, the resulting reactor performance, and safety considerations. This research works to overcome this problem by utilizing an in-pile thermal conductivity measurement in order to determine the thermal conductivity under prototypic conditions over a range of burnup. A multilayer quadrupoles analytic model is developed to describe the transient thermal interactions between a line heat source and nuclear fuel for in-pile thermal conductivity measurements. The analytic model was verified using a finite element analysis. Ultimately, the analytic model was used to perform parameter and sensitivity studies to explore the viability of accurately measuring the sample thermal conductivity under various measurement conditions. The analytic model was then compared to experimental measurements of polytetrafluoroethylene and stainless steel 304, which showed good agreement. Using the analytic model, optimization of the needle probe was then performed in order to improve the accuracy of thermal conductivity measurements for UO2 related to the fuel diameters, various probe diameters, and thermal contact resistance. The standard equation for data reduction using the slope to determine the thermal conductivity is not capable of measuring samples with prototypic diameters. However, the validated analytic model provides the foundation to elucidate a better understanding of in-pile thermal conductivity measurements in samples with a diameter as low as 10 mm.
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650 4 $a Alternative energy. $3 3436775
650 4 $a Engineering. $3 586835
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653 $a Ambient heat sources
653 $a Bismuth telluride thin films
653 $a Wet chemistry method
653 $a Thermal conductivity
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690 $a 0363
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710 2 $a University of Idaho. $b Mechanical Engineering. $3 3179561
773 0 $t Dissertations Abstracts International $g 81-02B.
790 $a 0089
791 $a Ph.D.
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793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13808929