Abstract This article presents a model for investigating the thermo- and fluid-dynamical behaviors of liquid carbon dioxide (LCO2) in pulverized coal, which is coupling of phase transition, multiphase flow, heat and mass transfer. In the model, the intensive non-isothermal effect caused by phase transition during the injection process is considered as a negative heat source associated with transient latent heat and the temperature–dependent physical parameters based on Span–Wagner equations are employed. By comparison with the data from model predictions and test under various nozzle diameters, the proposed model has been validated against experimental results from temperature variation. In addition, the dispersion behaviors of LCO2 in pulverized coal are extensively studied. The presented research provides a viable method for the prediction of dispersion and thermal behaviors when LCO2 is used for underground coal fires prevention and mitigation.

中文翻译：

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煤粉中液态二氧化碳注入过程中分散行为的模拟与实验验证

摘要 本文提出了一种研究粉煤中液态二氧化碳 (LCO2) 的热力学和流体力学行为的模型，它是相变、多相流、传热和传质的耦合。在模型中，注入过程中由相变引起的强烈非等温效应被认为是与瞬态潜热相关的负热源，并采用了基于 Span-Wagner 方程的温度相关物理参数。通过与不同喷嘴直径下模型预测和测试的数据进行比较，所提出的模型已经针对温度变化的实验结果进行了验证。此外，LCO2 在煤粉中的分散行为也得到了广泛的研究。