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Investigation of a Helium-Cooled Modular Divertor with Multiple Jets Using a Reversed Heat Flux Approach
Investigation of a Helium-Cooled Modular Divertor with Multiple Jets Using a Reversed Heat Flux Approach
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105517
- ISBN
- 9798263345525
- DDC
- 500
- 서명/저자
- Investigation of a Helium-Cooled Modular Divertor with Multiple Jets Using a Reversed Heat Flux Approach
- 발행사항
- [Sl] : Georgia Institute of Technology, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 419 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
- 주기사항
- Advisor: Yoda, Minami;Abdel-Khalik, Said I.
- 학위논문주기
- Thesis (Ph.D.)--Georgia Institute of Technology, 2024.
- 초록/해제
- 요약Controlled nuclear fusion stands out as a potential sustainable and large-scale energy source, mirroring the Sun's powering principle. Magnetic confinement fusion reactors, harnessing magnetic fields, facilitate fusion reactions within a "burning plasma" at temperatures exceeding 10°K. The divertor, an important plasma-facing component in future long-pulse magnetic fusion energy (MFE) reactors, is vital in sustaining fusion reactions by removing fusion products, impurities, and debris from the core plasma.This thesis focuses on the helium-cooled modular divertor with multiple jets (HEMJ) design. An HEMJ module employs an array of impinging jets to cool the inner surface of an endcap brazed to the plasma-facing surface, a tungsten tile. Originally proposed for the European demonstration DEMO fusion reactor, this concept has been experimentally shown to remove steady-state incident heat fluxes of at least 10 MW/m². Individual HEMJ "fingers" are initially assembled into bundles, or units, of nine fingers with a common inlet and outlet to form the divertor with a plasma-facing area of O(100 m²). To date, most of the studies and models of the HEMJ are based on a single finger, and there are few studies of even a single HEMJ unit.The main objective of this thesis was therefore to evaluate the thermofluids characteristics of a representative HEMJ bundle to verify that the results obtained from a single HEMJ finger can be used for a multi-finger bundle. The outer shell of the HEMJ bundle has a significantly different geometry beyond the endcap region and therefore may have different thermofluids behavior. The experimental studies presented here use areversed heat flux (RHF) approach, whereby heat is removed (rather than added) at the plasma-facing surface, thereby reducing the operating temperatures for the test section.This approach was first successfully validated in experimental studies of a single HEMJ finger by comparing RHF and normal heat flux tests for dimensionless heat transfer coefficient, or Nusselt number Nu, and dimensionless pressure drop, or pressure loss coefficient KL. Experimental studies were then conducted on a seven-finger HEMJ bundle where a central finger was surrounded by six outer fingers using the RHF method at the prototypical He pressure of 10 MPa, He temperatures as great as 300 °C and incident heat flux magnitudes as great as 5.9 MW/m². For this purpose, a larger helium loop with a mass flow rate as great as 100 g/s was designed and built.The results indicate that the Nu correlation developed from single-finger HEMJ studies is applicable to the seven-finger HEMJ unit at the prototypical mass flow rate of 6.8 g/s. In all cases, the K₁ results are higher than those for the single-finger HEMJ due in part to the addition of common inlet and outlet chambers. Computational fluid dynamics (CFD) studies of a seven-finger HEMJ unit were carried out with a commercial software package ANSYS and used to design the seven-finger test section and clarify some of the experimental results, including the impact of partial blockage of the jet exit holes on Nu and KL.
- 일반주제명
- Plasma
- 일반주제명
- Fluid dynamics
- 일반주제명
- Emissions
- 일반주제명
- Energy resources
- 일반주제명
- Boundary conditions
- 일반주제명
- Energy consumption
- 일반주제명
- Nuclear reactors
- 일반주제명
- Cooling
- 일반주제명
- Viscosity
- 일반주제명
- Electricity
- 일반주제명
- Greenhouse gases
- 일반주제명
- Alternative energy
- 일반주제명
- Fossil fuels
- 일반주제명
- Carbon dioxide
- 일반주제명
- Reynolds number
- 일반주제명
- Geometry
- 일반주제명
- Atmospheric sciences
- 일반주제명
- Climate change
- 일반주제명
- Fluid mechanics
- 일반주제명
- Mathematics
- 일반주제명
- Nuclear engineering
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105517
■006m o d
■007cr#unu||||||||
■020 ▼a9798263345525
■035 ▼a(MiAaPQ)AAI32309372
■035 ▼a(MiAaPQ)GeorgiaTech75320
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a500
■1001 ▼aMusa, Shekaib Ahmad.
■24510▼aInvestigation of a Helium-Cooled Modular Divertor with Multiple Jets Using a Reversed Heat Flux Approach
■260 ▼a[Sl]▼bGeorgia Institute of Technology▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a419 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: B.
■500 ▼aAdvisor: Yoda, Minami;Abdel-Khalik, Said I.
■5021 ▼aThesis (Ph.D.)--Georgia Institute of Technology, 2024.
■520 ▼aControlled nuclear fusion stands out as a potential sustainable and large-scale energy source, mirroring the Sun's powering principle. Magnetic confinement fusion reactors, harnessing magnetic fields, facilitate fusion reactions within a "burning plasma" at temperatures exceeding 10°K. The divertor, an important plasma-facing component in future long-pulse magnetic fusion energy (MFE) reactors, is vital in sustaining fusion reactions by removing fusion products, impurities, and debris from the core plasma.This thesis focuses on the helium-cooled modular divertor with multiple jets (HEMJ) design. An HEMJ module employs an array of impinging jets to cool the inner surface of an endcap brazed to the plasma-facing surface, a tungsten tile. Originally proposed for the European demonstration DEMO fusion reactor, this concept has been experimentally shown to remove steady-state incident heat fluxes of at least 10 MW/m². Individual HEMJ "fingers" are initially assembled into bundles, or units, of nine fingers with a common inlet and outlet to form the divertor with a plasma-facing area of O(100 m²). To date, most of the studies and models of the HEMJ are based on a single finger, and there are few studies of even a single HEMJ unit.The main objective of this thesis was therefore to evaluate the thermofluids characteristics of a representative HEMJ bundle to verify that the results obtained from a single HEMJ finger can be used for a multi-finger bundle. The outer shell of the HEMJ bundle has a significantly different geometry beyond the endcap region and therefore may have different thermofluids behavior. The experimental studies presented here use areversed heat flux (RHF) approach, whereby heat is removed (rather than added) at the plasma-facing surface, thereby reducing the operating temperatures for the test section.This approach was first successfully validated in experimental studies of a single HEMJ finger by comparing RHF and normal heat flux tests for dimensionless heat transfer coefficient, or Nusselt number Nu, and dimensionless pressure drop, or pressure loss coefficient KL. Experimental studies were then conducted on a seven-finger HEMJ bundle where a central finger was surrounded by six outer fingers using the RHF method at the prototypical He pressure of 10 MPa, He temperatures as great as 300 °C and incident heat flux magnitudes as great as 5.9 MW/m². For this purpose, a larger helium loop with a mass flow rate as great as 100 g/s was designed and built.The results indicate that the Nu correlation developed from single-finger HEMJ studies is applicable to the seven-finger HEMJ unit at the prototypical mass flow rate of 6.8 g/s. In all cases, the K₁ results are higher than those for the single-finger HEMJ due in part to the addition of common inlet and outlet chambers. Computational fluid dynamics (CFD) studies of a seven-finger HEMJ unit were carried out with a commercial software package ANSYS and used to design the seven-finger test section and clarify some of the experimental results, including the impact of partial blockage of the jet exit holes on Nu and KL.
■590 ▼aSchool code: 0078.
■650 4▼aPlasma
■650 4▼aFluid dynamics
■650 4▼aEmissions
■650 4▼aEnergy resources
■650 4▼aBoundary conditions
■650 4▼aEnergy consumption
■650 4▼aIndustrial plant emissions
■650 4▼aNuclear reactors
■650 4▼aCooling
■650 4▼aViscosity
■650 4▼aElectricity
■650 4▼aGreenhouse gases
■650 4▼aAlternative energy
■650 4▼aFossil fuels
■650 4▼aComputer aided design--CAD
■650 4▼aCarbon dioxide
■650 4▼aReynolds number
■650 4▼aGeometry
■650 4▼aAtmospheric sciences
■650 4▼aClimate change
■650 4▼aFluid mechanics
■650 4▼aMathematics
■650 4▼aNuclear engineering
■690 ▼a0363
■690 ▼a0725
■690 ▼a0404
■690 ▼a0204
■690 ▼a0405
■690 ▼a0552
■71020▼aGeorgia Institute of Technology.
■7730 ▼tDissertations Abstracts International▼g87-05B.
■790 ▼a0078
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360390▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


