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Heat Transfer in Unfrozen and Frozen Porous Media: Experimental Measurement and Pore-Scale Modeling

机译：在联接和冷冻多孔介质中的热传递：实验测量和孔径建模

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摘要

In this work, we conducted a mechanistic study on pore-scale mechanisms controlling heat transfer in partially saturated porous media at unfrozen and frozen conditions. Experimental measurement of effective thermal conductivity (ETC) of simulated partially saturated sediments was carried out to explore the effect of different parameters including pore and overburden pressures, temperature, and water/ice saturation on the pore-scale mechanisms governing heat transfer in multiphase porous media. The experimental measurements show that the heat transfer is a complex phenomenon affected by several important pore-scale mechanisms such as particle-particle conduction and particle-fluid-particle conduction, which are governed by water content and distribution, packing structure, wettability characteristics of grains, coordination number, and physical contact among sediment particle. A numerical model was also developed for prediction of ETC using free-energy lattice Boltzmann model and a space renormalization method. The model predictions were in good agreement with the experimental data, showing that the model is able to reliably estimate ETC with average relative deviations of less than 10%, as it appropriately incorporates the pore-scale mechanisms influencing ETC. The numerical model predictions were also compared with those of six predictive models available in the literature, and root-mean-square errors were calculated to assess its accuracy against the existing models.
机译：在这项工作中，我们进行了对孔隙尺度控制机制在解冻和冷冻条件下的部分饱和的多孔介质热传递的机理研究。模拟部分饱和的沉积物的有效热导率（ETC）的实验测量进行探索不同的参数，包括孔和覆盖层的压力，温度，和水/冰饱和度就关于在多相多孔介质传热的孔隙尺度机制的效果。实验测量表明，该热传递是受几个重要的孔隙级机制，如颗粒 - 颗粒传导和颗粒流体粒子传导，这是由水的含量和分布支配，包装结构，晶粒的润湿性特性的复杂的现象，配位数，和沉淀物颗粒之间的物理接触。数值模型也被开发用于使用自由能格子Boltzmann模型和空间重整化方法ETC的预测。该模型预测是在与实验数据一致，表明该模型能够可靠地估计ETC具有小于10％的平均相对误差，因为它结合了适当影响等孔隙尺度机制该数值模型的预测也与六个预测模型可在文献中进行比较，并计算根均方误差，以评估对现有模型的准确性。

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