Suppression of temperature oscillation in Czochralski convection by superimposing rotating flows

Jung Il Choi; Hyung Jin Sung

doi:10.1016/S0017-9310(96)00216-5

Suppression of temperature oscillation in Czochralski convection by superimposing rotating flows

Jung Il Choi, Hyung Jin Sung

Department of Computational Science and Engineering

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

A numerical study was made of a control technique of transient oscillatory flows in Czochralski convection. The suppression of temperature oscillation was achieved by changing the rotation rate of crystal rod Ω = Ω₀(1 + A_Ssin(2π/t_pf_St)), where A_S denotes the dimensionless rotation amplitude and f_S the 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/(Pr Re²). This parameter ranged in the study 0.225 ≤ Ra/(Pr Re²) ≤ 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 scrutinized.

Original language	English
Pages (from-to)	1667-1675
Number of pages	9
Journal	International Journal of Heat and Mass Transfer
Volume	40
Issue number	7
DOIs	https://doi.org/10.1016/S0017-9310(96)00216-5
Publication status	Published - 1997 May

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Mechanical Engineering
Fluid Flow and Transfer Processes

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title = "Suppression of temperature oscillation in Czochralski convection by superimposing rotating flows",

abstract = "A numerical study was made of a control technique of transient oscillatory flows in Czochralski convection. The suppression of temperature oscillation was achieved by changing the rotation rate of crystal rod Ω = Ω0(1 + ASsin(2π/tpfSt)), where AS denotes the dimensionless rotation amplitude and fS the frequency. Based on the inherent oscillatory time period of the melt (tp), the suppression rate of temperature oscillation was characterized by the mixed convection parameter Ra/(Pr Re2). This parameter ranged in the study 0.225 ≤ Ra/(Pr Re2) ≤ 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 scrutinized.",

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T1 - Suppression of temperature oscillation in Czochralski convection by superimposing rotating flows

AU - Choi, Jung Il

AU - Sung, Hyung Jin

PY - 1997/5

Y1 - 1997/5

N2 - A numerical study was made of a control technique of transient oscillatory flows in Czochralski convection. The suppression of temperature oscillation was achieved by changing the rotation rate of crystal rod Ω = Ω0(1 + ASsin(2π/tpfSt)), where AS denotes the dimensionless rotation amplitude and fS the frequency. Based on the inherent oscillatory time period of the melt (tp), the suppression rate of temperature oscillation was characterized by the mixed convection parameter Ra/(Pr Re2). This parameter ranged in the study 0.225 ≤ Ra/(Pr Re2) ≤ 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 scrutinized.

AB - A numerical study was made of a control technique of transient oscillatory flows in Czochralski convection. The suppression of temperature oscillation was achieved by changing the rotation rate of crystal rod Ω = Ω0(1 + ASsin(2π/tpfSt)), where AS denotes the dimensionless rotation amplitude and fS the frequency. Based on the inherent oscillatory time period of the melt (tp), the suppression rate of temperature oscillation was characterized by the mixed convection parameter Ra/(Pr Re2). This parameter ranged in the study 0.225 ≤ Ra/(Pr Re2) ≤ 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 scrutinized.

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Suppression of temperature oscillation in Czochralski convection by superimposing rotating flows

Abstract

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