Prediction and control of the transient oscillating flow in Czochralski convection초크랄스키 대류진동에서의 진동예측 및 제어

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dc.contributor.advisorSung, Hyung-Jin-
dc.contributor.advisor성형진-
dc.contributor.authorChoi, Jung-Il-
dc.contributor.author최정일-
dc.date.accessioned2011-12-14T06:58:04Z-
dc.date.available2011-12-14T06:58:04Z-
dc.date.issued1996-
dc.identifier.urihttp://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=105512&flag=dissertation-
dc.identifier.urihttp://hdl.handle.net/10203/46543-
dc.description학위논문(석사) - 한국과학기술원 : 기계공학과, 1996.2, [ ix, 50 p. ]-
dc.description.abstractA numerical study was made of prediction and control of the transient oscillatory flows in Czochralski convection. The temperature oscillation was computed over a broad range of the mixed convection paraemters, $Ra/PrRe^2$. Inherent temporal characteristics of the transient oscillating flow modes in Czochralski convection were investigated numerically. The effect of the Prandtl number on flow modes was discussed. It is found that the analogy of the mixed convection parameter to predict the onset state was coming into existence. Additional scalar transport equation, concentration equation, was computed for the various Re numbers. A close correlation between the temperature and the concentration was found out. The suppression of temperature oscillation was achieved by changing the rotation rate of crystal rod $Ω_S=Ω_{so}(1+A_s sin(2π/t_p f_S t))$, where $A_s$ denotes the rotation amplitude and $f_s$ is the dimensionless frequency. Based on the inherent oscillatory time period of the melt $(t_p)$, the suppression rate of temperature oscillation was characterized by the mixed convection parameter $Ra/PrRe^2$. The mixed convection was ranged 0.225≤$Ra/PrRe^2$≤0.929, which encompasses the buoyancy and forced convection dominant regimes. Computational results revealed that the temperature oscillation can be suppressed significantly by adjusting the control parameters. The uniformity of temperature distribution in space and in time near the crystal interface was scruntinized. The suppression of temperature oscillation was also examined for a realistic low Prandtl number flow.eng
dc.languageeng-
dc.publisher한국과학기술원-
dc.subjectConcentration Distribution-
dc.subjectTemperature Oscillation-
dc.subjectOscillating Flow-
dc.subjectCzochralski Convection-
dc.subjectACRT-
dc.subject도가니/결정봉 가속화 기법-
dc.subject농도 분포-
dc.subject온도진동-
dc.subject진동유동-
dc.subject초크랄스키 대류-
dc.titlePrediction and control of the transient oscillating flow in Czochralski convection-
dc.title.alternative초크랄스키 대류진동에서의 진동예측 및 제어-
dc.typeThesis(Master)-
dc.identifier.CNRN105512/325007-
dc.description.department한국과학기술원 : 기계공학과, -
dc.identifier.uid000943555-
dc.contributor.localauthorSung, Hyung-Jin-
dc.contributor.localauthor성형진-
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