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Multiphase Flow Modeling of Liquid Injectors- [electronic resource]
Multiphase Flow Modeling of Liquid Injectors- [electronic resource]
상세정보
- 자료유형
- 학위논문
- Control Number
- 0016932904
- International Standard Book Number
- 9798379871895
- Dewey Decimal Classification Number
- 530
- Main Entry-Personal Name
- Guerra, Joel Tynan.
- Publication, Distribution, etc. (Imprint
- [S.l.] : North Carolina State University., 2023
- Publication, Distribution, etc. (Imprint
- Ann Arbor : ProQuest Dissertations & Theses, 2023
- Physical Description
- 1 online resource(151 p.)
- General Note
- Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
- General Note
- Advisor: Watson, Benjamin;Edwards, Jack R.
- Dissertation Note
- Thesis (Ph.D.)--North Carolina State University, 2023.
- Restrictions on Access Note
- This item must not be sold to any third party vendors.
- Summary, Etc.
- 요약Techniques for modeling internal and external multiphase flows of injectors are investigated. Jet-in-crossflows have been extensively studied using a one-way coupled Eulerian/Lagrangian method, in which discrete droplets are injected at a mass flow rate equal to the continuous phase value. Both aerated- and pure- liquid injection cases are presented. Key improvements that pertain to the aerated-liquid injection simulations involve a vaporization scheme that transfers mass from the droplet phase to the continuous phase, and a new method of determining the vapor mass fraction from the droplet phase, thus improving the relative velocity estimate. The pure-liquid injection cases relied on the development of a new primary breakup model in which small droplets are stripped off large, recently injected parent droplets. Different child position formulations were tested to determine the influence of child position on overall spray dynamics. The improved relative velocity estimation from the aerated-liquid injection case was also used. Lastly, a modified version of the secondary breakup model used in the aerated-liquid injection study was implemented as a competing breakup mechanism against the primary model. Ultimately, using the relative velocity estimation based on the droplet phase mass fraction was the biggest factor in improving qualitative results. In all cases, large droplets are more likely to maintain their vertical momentum induced via injection. Once they escape the initial dense liquid column they experience little drag and turn downstream at a large angle, increasing the overall plume size. Droplets that experience high degrees of relative velocity will experience high drag values, causing them to break up into large numbers of small droplets and start to turn downstream. Smaller droplets follow the crossflow more closely. As a result, cases that have smaller distributions of droplets correspond to plumes with smaller penetration heights. The dissolution of carbon dioxide into a surrogate diesel fuel was investigated as a means of alternative atomization from aerated-liquid injection. This hinged on the development of a new vapor-liquid equilibrium routine which could predict the equilibrium state of gas bubbling out of a pseudo-liquid mixture. The addition of carbon dioxide results in a significantly different velocity profile within the nozzle. As the pressure decreases through the nozzle, the expanding gas results in an area reduction, causing the liquid velocity to rise. Not all carbon dioxide is found to bubble out of the mixture, suggesting that additional atomization may occur after injection.
- Subject Added Entry-Topical Term
- Phase transitions.
- Subject Added Entry-Topical Term
- Viscosity.
- Subject Added Entry-Topical Term
- Heat conductivity.
- Subject Added Entry-Topical Term
- Thermodynamics.
- Added Entry-Corporate Name
- North Carolina State University.
- Host Item Entry
- Dissertations Abstracts International. 85-01B.
- Host Item Entry
- Dissertation Abstract International
- Electronic Location and Access
- 로그인을 한후 보실 수 있는 자료입니다.
- Control Number
- joongbu:641677
MARC
008240221s2023 ulk 00 kor■001000016932904
■00520240214101138
■006m o d
■007cr#unu||||||||
■020 ▼a9798379871895
■035 ▼a(MiAaPQ)AAI30516355
■035 ▼a(MiAaPQ)NCState_Univ18402040767
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aGuerra, Joel Tynan.
■24510▼aMultiphase Flow Modeling of Liquid Injectors▼h[electronic resource]
■260 ▼a[S.l.]▼bNorth Carolina State University. ▼c2023
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2023
■300 ▼a1 online resource(151 p.)
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-01, Section: B.
■500 ▼aAdvisor: Watson, Benjamin;Edwards, Jack R.
■5021 ▼aThesis (Ph.D.)--North Carolina State University, 2023.
■506 ▼aThis item must not be sold to any third party vendors.
■520 ▼aTechniques for modeling internal and external multiphase flows of injectors are investigated. Jet-in-crossflows have been extensively studied using a one-way coupled Eulerian/Lagrangian method, in which discrete droplets are injected at a mass flow rate equal to the continuous phase value. Both aerated- and pure- liquid injection cases are presented. Key improvements that pertain to the aerated-liquid injection simulations involve a vaporization scheme that transfers mass from the droplet phase to the continuous phase, and a new method of determining the vapor mass fraction from the droplet phase, thus improving the relative velocity estimate. The pure-liquid injection cases relied on the development of a new primary breakup model in which small droplets are stripped off large, recently injected parent droplets. Different child position formulations were tested to determine the influence of child position on overall spray dynamics. The improved relative velocity estimation from the aerated-liquid injection case was also used. Lastly, a modified version of the secondary breakup model used in the aerated-liquid injection study was implemented as a competing breakup mechanism against the primary model. Ultimately, using the relative velocity estimation based on the droplet phase mass fraction was the biggest factor in improving qualitative results. In all cases, large droplets are more likely to maintain their vertical momentum induced via injection. Once they escape the initial dense liquid column they experience little drag and turn downstream at a large angle, increasing the overall plume size. Droplets that experience high degrees of relative velocity will experience high drag values, causing them to break up into large numbers of small droplets and start to turn downstream. Smaller droplets follow the crossflow more closely. As a result, cases that have smaller distributions of droplets correspond to plumes with smaller penetration heights. The dissolution of carbon dioxide into a surrogate diesel fuel was investigated as a means of alternative atomization from aerated-liquid injection. This hinged on the development of a new vapor-liquid equilibrium routine which could predict the equilibrium state of gas bubbling out of a pseudo-liquid mixture. The addition of carbon dioxide results in a significantly different velocity profile within the nozzle. As the pressure decreases through the nozzle, the expanding gas results in an area reduction, causing the liquid velocity to rise. Not all carbon dioxide is found to bubble out of the mixture, suggesting that additional atomization may occur after injection.
■590 ▼aSchool code: 0155.
■650 4▼aPhase transitions.
■650 4▼aViscosity.
■650 4▼aHeat conductivity.
■650 4▼aThermodynamics.
■690 ▼a0348
■71020▼aNorth Carolina State University.
■7730 ▼tDissertations Abstracts International▼g85-01B.
■773 ▼tDissertation Abstract International
■790 ▼a0155
■791 ▼aPh.D.
■792 ▼a2023
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16932904▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a202402▼f2024
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