Numerical investigation of the effect of nozzle geometry on the heat transfer rate of a confined turbulent impinging jet = 노즐 형상이 난류 국한충돌제트의 열전달률에 끼치는 영향에 대한 수치적 연구

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The effect of the nozzle geometry on the heat transfer rate of a confined turbulent impinging jet is investigated numerically. The open source code CFD program OpenFOAM is employed to conduct the numerical simulations. The turbulence is modeled through the RANS approach using the k-$omega$-SST-model. Numerically obtained Nusselt number distributions are compared to experimental findings. It is shown that predictions of the Nusselt number distributions are significantly improved when the nozzle geometry of the jet is included in the simulations. The improvements are more pronounced at higher Reynolds numbers. Separation phenomena inside the nozzles are observed and analyzed. Axial velocity and kinetic turbulence energy profiles at the nozzle outlet of simulations comprising nozzle geometry are compared with those of simulations with a uniform velocity inlet boundary. The effect of nozzle length is investigated numerically. It is shown that when the nozzle length is shorter than the reattachment length the overall heat transfer rate of the confined impinging jet is enhanced. The effect of inlet rounding of the nozzle is studied. The rounding of the inlet lessens separation, which in turn leads to an overall decrease in heat transfer.
Advisors
Kim, Sung Jinresearcher김성진researcher
Description
한국과학기술원 :기계공학과,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 기계공학과, 2017.8,[iv, 35 p. :]

Keywords

Confined impinging jet▼aheat transfer▼aRANS▼aturbulence▼anozzle geometry; 국한충돌제트▼a열전달▼aRANS▼a난류▼a노즐 형상

URI
http://hdl.handle.net/10203/242876
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=718546&flag=dissertation
Appears in Collection
ME-Theses_Master(석사논문)
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