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Modeling heat and mass transfer during ground freezing taking into account the salinity of the saturating fluid

机译：考虑到饱和流体的盐度，对地面冻结过程中的传热和传质进行建模

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Highlights•Heat and mass transfer processes during ground freezing-thawing are investigated.•A consistent framework is proposed to deal adequately with the salinity effect.•An experimental program on specimens saturated with NaCl solutions is performed.•The model capabilities are tested by comparing the measured and predicted results.AbstractIn geotechnical engineering applications, the modeling of artificial ground freezing is primarily aimed at predicting the extent of frozen zone around the cooling sources. This modeling could be more or less complex not only according to the material’s texture and the hydro-geological context but also to the salt concentration of the saturating fluid.Through a thermodynamically consistent framework, a fully coupled heat and mass transfer formulation considering the salinity effect was derived. This formulation was intended to capture the most relevant phenomena of ground freezing encountered in geotechnical applications. Particular attention was given to the phase change problem where appropriate simplifying assumptions were made in order to make the proposed methodology easier to apply in field applications. The proposed approach was validated by means of freezing-thawing laboratory tests, carried out on specimens initially fully saturated with sodium chloride solutions at various concentrations. Good agreement was obtained between the measured and predicted results.
机译： 突出显示 • 研究了地面冻融过程中的传热和传质过程。 • 提出了一个一致的框架来充分处理盐度效果。 • 执行了一个用NaCl溶液饱和的样本的实验程序。 •< / ce：label> 通过比较测量和预测的结果。 摘要 在岩土工程应用中，人工地面冻结的建模主要旨在预测冷却源周围的冻结区范围。这种建模不仅取决于材料的质地和水文地质背景，而且取决于饱和流体的盐浓度，都可能或多或少复杂。

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