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Separate and Integral Effect Experiments of Sodium Heat Pipes Using High-Resolution X-Ray Radiography and Application to Microreactors
Separate and Integral Effect Experiments of Sodium Heat Pipes Using High-Resolution X-Ray Radiography and Application to Microreactors
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211153016
- ISBN
- 9798384045816
- DDC
- 620
- 저자명
- Huang, Pei-Hsun.
- 서명/저자
- Separate and Integral Effect Experiments of Sodium Heat Pipes Using High-Resolution X-Ray Radiography and Application to Microreactors
- 발행사항
- [Sl] : University of Michigan, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 194 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
- 주기사항
- Advisor: Manera, Annalisa;Petrov, Victor.
- 학위논문주기
- Thesis (Ph.D.)--University of Michigan, 2024.
- 초록/해제
- 요약In very recent years, several research efforts have been dedicated to so-called microreactors. Several designs are being pursued by various companies such as Westinghouse, OKLO, X-energy, HolosGen, USNC, to name a few, with financial support from private industries, the US Department of Energy (DOE) and the US Department of Defense (DOD). With power production up to 20 MWe, these reactors are designed to be easily transported within ISO containers and either provide heat for industrial processes or produce electricity in remote locations, which often rely on Diesel generators (e.g. mining operations). Several of these microreactor concepts use sodium heat pipes for passive heat removal, which means no external electricity is needed. The use of alkali metal heat pipes enables the system to operate fully passively with high mobility. To optimize the design of heat pipe microreactors and assess their behaviour under accident scenarios, the heat removal performance of sodium heat pipes and their behaviour in normal operation and postulated accident scenarios need to be thoroughly investigated so that reliable models can be developed to predict the behaviour of heat pipes under various operating conditions and safety analyses of heat pipe microreactor concepts can be carried out.Past studies on alkali metal heat pipes are scarce and have been limited to the system-level behaviour, without information on the flow phenomena of the working fluid inside the heat pipe. In addition, significant uncertainties exist on the heat transfer characteristics across the full range of flow regimes including dryout conditions. The visualization of the working fluid phases within the heat pipe is essential to gain insights into the particular flow regime developing under the different steady-state and transient operating conditions of the heat pipe. This is because the flow regime has a strong impact on the heat transfer and therefore heat removal performance of the heat pipe. This thesis aims to provide high-resolution experimental data for sodium heat pipes under various operating conditions, including startup, shutdown and abnormal conditions. Two experimental facilities were designed and built. The first experimental facility, the MIchigan single SOdium Heat pipe separate-effect (MISOH1) test facility, allows the investigation of the behaviour of a single sodium heat pipe under well-controlled heating powers and boundary conditions. The facility allows the investigation of the effect of various parameters such as evaporator heating rate, cooling conditions in the condenser region, heat pipe orientation, and the sodium filling ratio within the heat pipe itself. The Michigan High-Resolution Tomographic Imaging (CHROMA) system, which allows for high-speed, high-resolution x-ray radiography imaging, is employed at the MISOH1 facility to measure the time-dependent two-phase vapor-liquid sodium structures within the heat pipe under different operating regimes. The second facility, the MIchigan SOdium Heat pipe bundle (MISOH2) test facility, has been specifically designed to simulate the thermal-hydraulic behaviour of a sodium heat pipe microreactor during normal operation and postulated accidents. Special attention is focused on the potential occurrence of "cascade failure", which might be caused by the heat load redistribution on neighbouring heat pipes consequent to the failure of local heat pipes. For the separate effect of a single sodium heat pipe, the thesis provides the first-time experimental database concerning various effects of key parameters, synchronized with x-ray radiography measurement. Several boiling characteristics coupled with these parameters were identified. The work incorporated the first-time experiment on the integral effect of heat pipes bundle. The influence of local heat pipe boundary change or failure on the neighbouring heat pipes was learned. Both experimental databases can be used for the development and validation of heat pipe models.
- 일반주제명
- Engineering
- 일반주제명
- Nuclear engineering
- 일반주제명
- Nuclear physics
- 일반주제명
- Energy
- 키워드
- Sodium heat pipe
- 키워드
- Geyser boiling
- 기타저자
- University of Michigan Nuclear Engineering & Radiological Sciences
- 기본자료저록
- Dissertations Abstracts International. 86-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798384045816
■035 ▼a(MiAaPQ)AAI31631534
■035 ▼a(MiAaPQ)umichrackham005788
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a620
■1001 ▼aHuang, Pei-Hsun.
■24510▼aSeparate and Integral Effect Experiments of Sodium Heat Pipes Using High-Resolution X-Ray Radiography and Application to Microreactors
■260 ▼a[Sl]▼bUniversity of Michigan▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a194 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-04, Section: B.
■500 ▼aAdvisor: Manera, Annalisa;Petrov, Victor.
■5021 ▼aThesis (Ph.D.)--University of Michigan, 2024.
■520 ▼aIn very recent years, several research efforts have been dedicated to so-called microreactors. Several designs are being pursued by various companies such as Westinghouse, OKLO, X-energy, HolosGen, USNC, to name a few, with financial support from private industries, the US Department of Energy (DOE) and the US Department of Defense (DOD). With power production up to 20 MWe, these reactors are designed to be easily transported within ISO containers and either provide heat for industrial processes or produce electricity in remote locations, which often rely on Diesel generators (e.g. mining operations). Several of these microreactor concepts use sodium heat pipes for passive heat removal, which means no external electricity is needed. The use of alkali metal heat pipes enables the system to operate fully passively with high mobility. To optimize the design of heat pipe microreactors and assess their behaviour under accident scenarios, the heat removal performance of sodium heat pipes and their behaviour in normal operation and postulated accident scenarios need to be thoroughly investigated so that reliable models can be developed to predict the behaviour of heat pipes under various operating conditions and safety analyses of heat pipe microreactor concepts can be carried out.Past studies on alkali metal heat pipes are scarce and have been limited to the system-level behaviour, without information on the flow phenomena of the working fluid inside the heat pipe. In addition, significant uncertainties exist on the heat transfer characteristics across the full range of flow regimes including dryout conditions. The visualization of the working fluid phases within the heat pipe is essential to gain insights into the particular flow regime developing under the different steady-state and transient operating conditions of the heat pipe. This is because the flow regime has a strong impact on the heat transfer and therefore heat removal performance of the heat pipe. This thesis aims to provide high-resolution experimental data for sodium heat pipes under various operating conditions, including startup, shutdown and abnormal conditions. Two experimental facilities were designed and built. The first experimental facility, the MIchigan single SOdium Heat pipe separate-effect (MISOH1) test facility, allows the investigation of the behaviour of a single sodium heat pipe under well-controlled heating powers and boundary conditions. The facility allows the investigation of the effect of various parameters such as evaporator heating rate, cooling conditions in the condenser region, heat pipe orientation, and the sodium filling ratio within the heat pipe itself. The Michigan High-Resolution Tomographic Imaging (CHROMA) system, which allows for high-speed, high-resolution x-ray radiography imaging, is employed at the MISOH1 facility to measure the time-dependent two-phase vapor-liquid sodium structures within the heat pipe under different operating regimes. The second facility, the MIchigan SOdium Heat pipe bundle (MISOH2) test facility, has been specifically designed to simulate the thermal-hydraulic behaviour of a sodium heat pipe microreactor during normal operation and postulated accidents. Special attention is focused on the potential occurrence of "cascade failure", which might be caused by the heat load redistribution on neighbouring heat pipes consequent to the failure of local heat pipes. For the separate effect of a single sodium heat pipe, the thesis provides the first-time experimental database concerning various effects of key parameters, synchronized with x-ray radiography measurement. Several boiling characteristics coupled with these parameters were identified. The work incorporated the first-time experiment on the integral effect of heat pipes bundle. The influence of local heat pipe boundary change or failure on the neighbouring heat pipes was learned. Both experimental databases can be used for the development and validation of heat pipe models.
■590 ▼aSchool code: 0127.
■650 4▼aEngineering
■650 4▼aNuclear engineering
■650 4▼aNuclear physics
■650 4▼aEnergy
■653 ▼aSodium heat pipe
■653 ▼aGeyser boiling
■653 ▼aDeveloped boiling
■653 ▼aX-ray radiography
■653 ▼aHeat pipes bundle
■653 ▼aSpecial purpose reactor
■690 ▼a0537
■690 ▼a0552
■690 ▼a0756
■690 ▼a0791
■71020▼aUniversity of Michigan▼bNuclear Engineering & Radiological Sciences.
■7730 ▼tDissertations Abstracts International▼g86-04B.
■790 ▼a0127
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164558▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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