中国科技论文在线

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2009年05月22日

【期刊论文】Three-dimensional unsteady convection in LiCaAlF6-Czochralski growth

曾忠， Zhong Zenga， b， *， Jingqiu Chena， Hiroshi Mizusekib， Tsuguo Fukudac， Yoshiyuki Kawazoeb

Journal of Crystal Growth 266(2004)81-87，-0001，（）：

-1年11月30日

By means of the finite volume method, the evolution of the three-dimensional unsteady convection with increasing crystal rotation is simulated numerically for LiCaAlF6 in a model of Czochralski crystal growth. The effect of Marangoni convection on the flow structure features is investigated, and the results indicate that ignoring Marangoni convection causes a large deviation.

A1.， Computer simulation， A1.， Convection， A1.， Fluid flows， A1.， Marangoni convection， A2.， Czochralski method， B1.， Fluoride single crystal

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2009年05月22日

【期刊论文】Three-dimensional oscillatory convection of LiCaAlF6 melts in Czochralski crystal growth

曾忠， Zhong Zenga， b， *， Jingqiu Chena， Hiroshi Mizusekib， Kiyoshi Shimamurab， c， Tsuguo Fukudab， d， Yoshiyuki Kawazoeb

Journal of Crystal Growth 252(2003)538-549，-0001，（）：

-1年11月30日

摘要

Three-dimensional (3D) unsteady mixed thermal buoyancy, Marangoni and forced convection of LiCaAlF6 (LiCAF) melts (Prandtl number PrE1.4) are investigated numerically for model set up typically for Czochralski crystal growth. With increasing crystal rotation rate, convection evolves from steady axisymmetric to three-dimensional oscillatory convection with varying spatio-temporal features. The details of the oscillatory convection structures are presented.

A1.， Computer simulation， A1.， Convection， A1.， Fluid flows， A1.， Marangoni convection， A2.， Czochralski method， B1.， Fluoride single crystal

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2009年05月22日

【期刊论文】Usefulness of experiments with model fluid for thermocapillary convectionFeffect of Prandtl number on two-dimensional thermocapillary convection

曾忠， Zhong Zenga， *， Hiroshi Mizusekia， Kiyoshi Shimamuraa， Tsuguo Fukudaa， Yoshiyuki Kawazoea， Kazuyuki Higashinob

Journal of Crystal Growth 234(2002)272-278，-0001，（）：

-1年11月30日

摘要

The floating zone technique is promising to realize large, high-quality crystals under microgravity. Thermocapillary flow, which is the dominant convection in a floating zone under microgravity, has been widely reported in the literature to be extremely sensitive to the Prandtl number Pr: In the present study, the effect of Pr on steady thermocapillary convection is re-evaluated based on both analytical and numerical solutions. The results indicate that an approximate similarity of temperature and velocity structures in a large Pr range is realized under suitable conditions, fixing the Marangoni number Ma; in steady two-dimensional regime.

A1.， Computer simulation， A1.， Fluid flow， A1.， Heat transfer， A1.， Marangoni convection， A1.， Thermocapillary convection， A2.， Floating zone technique

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2009年05月22日

【期刊论文】Structure Similarity of Mixed Buoyancy-Thermocapillary Flow in Half-Zone Liquid Bridge

曾忠， Zhong Zeng， *， Hiroshi Mizuseki， Kazuyuki Higashino， Kiyoshi Shimamura， Tsuguo Fukuda and Yoshiyuki Kawazoe

Materials Transactions, Vol. 42, No.11 (2001) pp. 2322 to 2331，-0001，（）：

-1年11月30日

摘要

The mixed buoyancy-thermocapillary flow in a half-zone liquid bridge with the dynamic Bond number Bd≈α(1) is investigated numerically by the finite volume method. The similarities of temperature and velocity structures are realized under conditions of fixed Marangoni and Rayleigh numbers in steady two-dimensional regime for a suitable Prandtl number range.

thermocapillary convection,， Marangoni convection,， floating zone,， half-zone,， buoyancy,， similarity,， nature convection

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2009年05月22日

【期刊论文】Three-dimensional oscillatory thermocapillary convection in liquid bridge under microgravity

曾忠， Zhong Zenga， *， Hiroshi Mizusekia， Kiyoshi Simamuraa， Tsuguo Fukudaa， Kazuyuki Higashinob， Yoshiyuki Kawazoea

International Journal of Heat and Mass Transfer 44(2001)3765-3774，-0001，（）：

-1年11月30日

摘要

Three-dimensional oscillatory thermocapillary convection in silicone oil liquid bridge is studied numerically by means of finite volume method (FVM). The results reveal the existence of two different oscillatory modes: pulsating and rotating oscillations. Close to the onset of oscillation, the pulsating oscillatory convection is observed. With the increment of Marangoni number Ma, the pulsating oscillatory convection is replaced by rotating oscillatory convection, where the temperature and velocity fields demonstrate the characteristics of rotation. An approximately linear relationship between Ma and dimensionless main frequency f*=fH2χ1 is found for As=4.0 in periodic oscillatory regime. This relationship becomes a little more complex for As=1.0.

Thermocapillary， Marangoni convection， Microgravity， Instability， Floating zone， Half-zone， Liquid bridge

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