The current study focuses on the melting behavior of a scrap bar with low carbon content in hot metal which contains high carbon concentration by applying experiments and mathematical modelings. The experiments suggest that higher temperature is favorable for the melting of the bar and the melting rate of the bar is initially high while decreased to a relative stable level after 90 s in the current conditions. It can be found from the mathematical results that the bar temperature is increased near to bath temperature in about 20 s after it was immersed into the bath, and the temperature in the axis of the bar is not distributed evenly during the temperature increase stage. Moreover, the mathematical results shows that a bath circulation flow would be formed in the bath under the effects of temperature and carbon distribution during the melting process. The bath flow near the melting interface would influence the carbon concentration of the molten phase, in turn, affects the melting rate of the bar in the vertical direction. Both the experimental and mathematical results show that the melting rate in the upper part, which is in the upstream of the bath flow, is higher than that of the middle part, followed by the down part of the bar in the downstream of the flow, in which the carbon concentration is much lower than that of the bath. At this period, the main factor that dominate the bar melting is not the temperature but the carbon distribution at the melting interface after the bar temperature is increased to the bath temperature.

中文翻译：

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铁屑在高铁水中熔化行为的数值模拟

当前的研究集中在通过应用实验和数学模型来研究低碳含量高铁水中废钢的熔化行为。实验表明，较高的温度有利于条的熔化，并且条的熔化速率最初较高，而在当前条件下90 s后降低到相对稳定的水平。从数学结果可以发现，在浸入浴中之后，棒温度在约20秒内升高至接近浴温度，并且在升温阶段，棒的轴线上的温度不均匀地分布。此外，数学结果表明，在熔化过程中，在温度和碳分布的影响下，熔池中会形成熔池循环流。熔体界面附近的熔池流会影响熔融相的碳浓度，进而影响竖向棒的熔化速率。实验和数学结果均表明，在熔池流上游的上部熔化速率高于中部熔解速率，其次是在熔流下游的棒材下部熔化速率，其中的碳浓度远低于镀液的碳浓度。在这个时期