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首页> 外文期刊>Journal of porous media >LATTICE BOLTZMANN SIMULATION OF EFFECTIVE THERMAL CONDUCTIVITY OF POROUS MEDIA WITH MULTIPHASE
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LATTICE BOLTZMANN SIMULATION OF EFFECTIVE THERMAL CONDUCTIVITY OF POROUS MEDIA WITH MULTIPHASE

机译：多相多孔介质有效热导率的格子Boltzmann模拟

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摘要

The particle size, distribution, and orientation will decide the heat conduction behavior of porous media, and the trends of different effects can be obtained according to the various model assumptions. With or without consideration of the thermal contact resistance, the effects of the grain size on the thermal conductivity of porous materials may be adverse. The lattice Boltzmann method has microscopic and mesoscopic features that facilitate the processing of irregular boundary conditions for porous media. A corrected heat flux of the thermal lattice Boltzmann model is proposed in this paper, which naturally ensures heat flux continuity at the phase-phase interface. A new equivalent relaxation time is set at the phase-phase interface in the thermal lattice Boltzmann model, and through the use of the thermal energy transport model with series and parallel sets, the reliability of the new method in dealing with the phase-phase interface is verified. Porous media are generated by the quartet structure generation set. The effective thermal conductivity is obtained both with single-phase and multiphase fluid in the porous media. The effective thermal conductivity of porous media increases with increasing particle size. The connectivity of the particles along the heat transfer direction provides a preferential path for heat transfer, which creates higher effective thermal conductivity. When wetting fluid, with lower thermal conductivity, is absorbed on the porous matrix, the predicted effective thermal conductivity is close to the Hashin-Shtrikman lower bound.
机译：粒径，分布和取向将决定多孔介质的导热行为，并且可以根据各种模型假设获得不同效果的趋势。在考虑或不考虑热接触电阻的情况下，晶粒尺寸对多孔材料的导热率的影响可能是不利的。格子玻尔兹曼方法具有微观和介观特征，有助于处理多孔介质的不规则边界条件。提出了热晶格玻尔兹曼模型的校正热通量，自然可以确保相-相界面处的热通量连续性。在热晶格Boltzmann模型的相-相界面处设置了一个新的等效弛豫时间，并通过使用具有串联和并行集的热能传输模型，该新方法在处理相-相界面时的可靠性已验证。多孔介质是由四重结构生成集生成的。使用多孔介质中的单相和多相流体均可获得有效的热导率。多孔介质的有效导热系数随粒径的增加而增加。沿着热传递方向的颗粒的连通性为热传递提供了优先的路径，这产生了更高的有效热导率。当具有较低导热系数的润湿流体被吸收在多孔基质上时，预测的有效导热系数接近Hashin-Shtrikman下限。

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