GeoChemFoam: Direct modelling of flow and heat transfer in micro-CT images of porous media
GeoChemFoam: Direct modelling of flow and heat transfer in micro-CT images of porous media
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DOI：
10.1007/s00231-022-03221-2
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发表时间：
2021-10
影响因子：
2.2
通讯作者：
J. Maes;H. Menke
中科院分区：
文献类型：
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作者：
J. Maes;H. Menke
GeoChemFoam是一个开源的基于openfoam的数值建模工具箱，它包括一系列定制包，用于解决复杂的流动过程，包括带有界面转移的多相传输、多尺度多孔介质中的单相流动以及带有矿物溶解的反应性传输。在本文中，我们提出了GeoChemFoam的新型数值模型，用于模拟多孔介质微ct图像中的共轭传热。GeoChemFoam使用微连续体方法，利用每个计算单元中流体和固体的体积分数来描述流固界面。速度场采用Brinkman方程求解，渗透率采用Kozeny-Carman方程计算，得到固相渗透率接近于零。然后用速度非零的热对流求解共轭传热，导热系数计算为相导热系数加权相体积分数的谐波平均值。我们的模型通过与简单二维几何的标准双介质方法的比较得到了验证。然后，我们模拟了共轭传热，并计算了不同流动状态下的传热系数，并在Bentheimer砂岩的微ct图像中模拟了类似注入地热储层的流体，并对具有随机球体填料的多孔热交换器进行了灵敏度分析。
GeoChemFoam is an open-source OpenFOAM-based numerical modelling toolbox that includes a range of custom packages to solve complex flow processes including multiphase transport with interface transfer, single-phase flow in multiscale porous media, and reactive transport with mineral dissolution. In this paper, we present GeoChemFoam’s novel numerical model for simulation of conjugate heat transfer in micro-CT images of porous media. GeoChemFoam uses the micro-continuum approach to describe the fluid-solid interface using the volume fraction of fluid and solid in each computational cell. The velocity field is solved using Brinkman’s equation with permeability calculated using the Kozeny-Carman equation which results in a near-zero permeability in the solid phase. Conjugate heat transfer is then solved with heat convection where the velocity is non-zero, and the thermal conductivity is calculated as the harmonic average of phase conductivity weighted by the phase volume fraction. Our model is validated by comparison with the standard two-medium approach for a simple 2D geometry. We then simulate conjugate heat transfer and calculate heat transfer coefficients for different flow regimes and injected fluid analogous to injection into a geothermal reservoir in a micro-CT image of Bentheimer sandstone and perform a sensitivity analysis in a porous heat exchanger with a random sphere packing.