Flow investigations in liquid metals for crystal growth under the influence of a travelling magnetic field using a dual-plane ultrasound measurement system

使用双平面超声测量系统研究行进磁场影响下晶体生长的液态金属的流动

基本信息

项目摘要

The objective of the research project is a detailed investigation of complex flows occurring at the directed solidification of metal melts using the vertical gradient freeze method with a travelling magnetic field. For growing semiconductor crystals from a melt, the crystal quality can be improved by applying spatially and temporally tailored magnetic fields during the growth process. The occurring flow fields are characterized by complex three-dimensional and time-varying structures. The flow measurements have to be performed simultaneously in at least two planes. Up to now, such investigations failed because of the insufficient properties of measurement techniques applicable to liquid metals. To overcome this problem, a novel multi-component dual-plane ultrasound measurement system will be employed which uses ultrasound-arrays driven in a combined time and frequency division multiplexing operation. Due to the progress in available computing power the flow patterns and the temporal evolution from one to another can be recorded and studied in real-time and especially for long measurement time intervals.In this project, imaging investigations of the melt flow in two planes under thermal, geometric and magnetic conditions relevant for crystal growth will be accomplished for the first time. The investigation of transient and fluctuating flow situations in dependence of the melt height takes centre stage. From the fluid mechanical point of view a special interest lies in the point how the transition between two-dimensional and three-dimensional as well as between stationary and time-varying flow patterns takes place. The results gained by experiment will continuously be compared with those of numeric simulation. This benefits not only the development of the model configurations but also the verification of numeric models for flow simulation. The results will be transferred to real crystal growth processes by means of scaling laws which will be developed during the project. They also will be the basis for the development of future strategies for flow control using magnetic fields.
该研究项目的目的是详细研究在金属熔体定向凝固过程中使用垂直梯度冻结法和行进磁场的复杂流动。为了从熔体中生长半导体晶体,可以在生长过程中施加空间和时间上定制的磁场来提高晶体质量。所产生的流场具有复杂的三维和时变结构。流量测量必须在至少两个平面上同时进行。到目前为止,由于适用于液态金属的测量技术的性能不足,这类调查失败了。为了克服这一问题,将采用一种新颖的多分量双平面超声测量系统,该系统使用时分和频分复合操作驱动的超声阵列。由于可用计算能力的进步,可以实时记录和研究熔体从一种流动模式到另一种流动模式的时间演变,特别是在较长的测量时间间隔内。在这个项目中,将首次完成与晶体生长相关的热、几何和磁场条件下两个平面内熔体流动的成像研究。与熔体高度相关的瞬变和波动流动情况的研究占据了中心位置。从流体力学的观点来看,人们特别感兴趣的是如何在二维和三维之间以及在静止和时变流型之间发生转变。实验结果将继续与数值模拟结果进行比较。这不仅有利于模型构型的发展,也有利于流动模拟数值模型的验证。结果将通过在项目期间开发的比例定律被转移到实际的晶体生长过程中。它们也将是未来开发利用磁场进行流量控制的策略的基础。

项目成果

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Professor Dr.-Ing. Jürgen W. Czarske其他文献

Professor Dr.-Ing. Jürgen W. Czarske的其他文献

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{{ truncateString('Professor Dr.-Ing. Jürgen W. Czarske', 18)}}的其他基金

Physical Layer Security of Multimode Optical Fiber Transmission Systems
多模光纤传输系统的物理层安全
  • 批准号:
    410148962
  • 财政年份:
    2018
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Laser based tomographic measurement of the local acoustic impedance of overflowed liners (TOMLIM)
基于激光断层扫描测量溢出内衬的局部声阻抗 (TOMLIM)
  • 批准号:
    408927635
  • 财政年份:
    2018
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Full-Field Laser Vibrometry for Combustion Diagnostics
用于燃烧诊断的全场激光测振法
  • 批准号:
    282277522
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Aberration correction for real-time measurements in adaptive confocal microscopy
自适应共焦显微镜实时测量的像差校正
  • 批准号:
    271021903
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Adaptive Lasersysteme mit Wellenfrontregelung und Phasenkonjugation für Strömungsmessungen bei Brechungsindexeffekten
具有波前控制和相位共轭的自适应激光系统,用于具有折射率效应的流量测量
  • 批准号:
    259811751
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Reinhart Koselleck Projects
Novel three dimensional shape measurement technique for fast rotating objects
用于快速旋转物体的新型三维形状测量技术
  • 批准号:
    235791889
  • 财政年份:
    2013
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Laser optical measurements of the acoustic particle velocity at bias flow liners with grazing flow
激光光学测量偏流衬管处掠流声粒子速度
  • 批准号:
    196686122
  • 财政年份:
    2011
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Optische Untersuchung dynamischer Deformationen schnell drehender Rotoren
快速旋转转子动态变形的光学研究
  • 批准号:
    182207875
  • 财政年份:
    2011
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Zeitlich hochauflösendes Doppler-Global-Velozimeter zur Turbulenzspektrenmessung
用于湍流谱测量的高分辨率多普勒全局速度计
  • 批准号:
    158620360
  • 财政年份:
    2010
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Neuartiger Laser-Doppler-Sensor zur Abstands- und Formvermessung bewegter Festkörper
创新的激光多普勒传感器,用于测量移动固体的距离和形状
  • 批准号:
    29343999
  • 财政年份:
    2006
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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Plasmas in- and in-contact with liquids: fundamental investigations and applications in nanomaterial synthesis and liquid processing
与液体接触的等离子体:纳米材料合成和液体加工的基础研究和应用
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