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Use of Cold Liquid Metal Models for Investigations of the Fluid Flow in the Continuous Casting Process

机译:使用冷液态金属模型研究连铸过程中的流体流动

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摘要

The measurement of flow quantities in a real steal caster is still a huge challenging task. Up to now, only some rough velocity information was obtained from casting plants with liquid steel. More insight into the casting process can be achieved by model experiments, which operate with low melting point liquid metals. The advantage of such cold metal laboratory experiments consists in the capability to obtain quantitative flow measurements with a reasonable spatial and temporal resolution. They are therefore an important tool to investigate the flow structure and related transport processes in melt flows relevant for metallurgical applications. We present two experimental facilities for modeling the continuous casting process of steel. The parameters and dimensions of the facilities will be given. LIMMCAST, the bigger setup, is using the alloy SnBi and works at temperatures of 200-400°C. Possibilities for flow investigations in tundish, submerged entry nozzle, and mould will be discussed. Next, the smaller set-up Mini-LIMMCAST will be presented. This experimental setup works with the alloy GalnSn, which is already liquid at room temperature. During the last decade, new measurement techniques have been established for detecting the velocities in liquid metal flows and which are operating in the considered temperature ranges. By this, it is now possible to do experimental investigations for a satisfying characterization of flow quantities in the two models. A selection of results from both experimental setups will be shown. These flow measurements deliver a valuable experimental database being suitable for validation of numerical simulations.
机译:在真正的脚轮中测量流量仍然是一项艰巨的任务。到目前为止,仅从液态钢铸造厂获得了一些粗略的速度信息。通过使用低熔点液态金属运行的模型实验可以更深入地了解铸造过程。这种冷金属实验室实验的优势在于能够以合理的时空分辨率获得定量的流量测量值。因此,它们是研究与冶金应用相关的熔体流动的流动结构和相关运输过程的重要工具。我们提供了两个用于模拟钢的连续铸造过程的实验设备。将给出设施的参数和尺寸。较大的设置LIMMCAST使用的是SnBi合金,可在200-400°C的温度下工作。将讨论在中间包,浸入式注口和模具中进行流量研究的可能性。接下来,将介绍较小的Mini-LIMMCAST。此实验装置适用于GalnSn合金,该合金在室温下已经呈液态。在过去的十年中,已经建立了新的测量技术来检测液态金属流中的速度,并在考虑的温度范围内运行。这样,现在可以进行实验研究,以令人满意地表征两个模型中的流量。将显示两种实验设置的结果选择。这些流量测量结果提供了一个有价值的实验数据库,适用于数值模拟的验证。

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