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Experimental and numerical studies on molten salt migration in porous system with phase change

机译：相变在多孔体系中熔盐迁移的实验与数值研究

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Molten salt is promising high temperature heat transfer fluid, and its transport in porous media is an important problem for molten salt application. In this paper, molten salt migration and phase change in cold porous system packed with sand particles is experimentally and numerically studied. Experimental results show that high temperature molten salt continuously migrates and a transparent liquid molten salt layer appears during discharge stage with molten salt pouring into porous bed, and then it solidifies as white opaque solid block during post-discharge stage. A transient axial symmetrical flow and heat transfer model is developed using volume of fluid model and linear approximation in mushy zone, and the simulated results very well fit with experiment. After molten salt discharges and contacts with the cold surface, a thin solid layer quickly forms for solidification, and then it gradually expands and finally becomes a solid block. Since the earlier solid layer hinders molten salt vertical flow, liquid molten salt will flow across the outer boundary of solid layer, and then molten salt layer below the surface becomes thicker. After molten salt totally solidifies, an inner region with little molten salt will probably exist inside molten salt solid block. The maximum migration region for molten salt in cold porous system is affected by structural and operating parameters. For larger porosity and particle diameter or higher molten salt temperature, molten salt flow in porous system has less flow resistance, and then the maximum migration height can be increased, while the migration diameter is reduced. (C) 2018 Elsevier Ltd. All rights reserved.
机译：熔融盐是有前途的高温传热流体，其在多孔介质中的运输是熔融盐应用中的重要问题。本文对含砂颗粒的冷多孔体系中的熔盐迁移和相变进行了实验和数值研究。实验结果表明，高温熔融盐不断迁移，在排出阶段出现透明的液态熔融盐层，熔融盐倒入多孔床中，然后在排出后固化为白色不透明固体块。利用流体模型和泥状区的线性近似，建立了瞬态轴对称流动和传热模型，仿真结果与实验结果吻合良好。熔融盐排出并与冷表面接触后，会迅速形成一层薄的固体层进行固化，然后逐渐膨胀并最终变成固体块。由于较早的固体层阻碍了熔盐的垂直流动，因此液态熔盐将流过固体层的外边界，然后表面以下的熔盐层变厚。熔融盐完全固化后，熔融盐固体块内部可能会存在熔融盐少的内部区域。冷多孔系统中熔融盐的最大迁移区域受结构和操作参数的影响。对于较大的孔隙度和粒径或较高的熔盐温度，多孔系统中的熔盐流动具有较小的流阻，然后可以增加最大迁移高度，同时减小迁移直径。 （C）2018 Elsevier Ltd.保留所有权利。

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