Suppression of temperature oscillation in Czochralski convection by superimposing rotating flows

Jung-il Choi, Hyung Jin Sung

Research output: Contribution to journalArticle

11 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 + 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.

Original languageEnglish
Pages (from-to)1667-1675
Number of pages9
JournalInternational Journal of Heat and Mass Transfer
Volume40
Issue number7
DOIs
Publication statusPublished - 1997 Jan 1

Fingerprint

convection
retarding
oscillations
Crystals
Mixed convection
forced convection
Forced convection
Buoyancy
buoyancy
Temperature
crystals
temperature
Temperature distribution
temperature distribution
rods
adjusting
Convection
Aligeron

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

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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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Suppression of temperature oscillation in Czochralski convection by superimposing rotating flows. / Choi, Jung-il; Sung, Hyung Jin.

In: International Journal of Heat and Mass Transfer, Vol. 40, No. 7, 01.01.1997, p. 1667-1675.

Research output: Contribution to journalArticle

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