Numerical simulations of water freezing processes in cavities and cylindrical enclosures
Numerical simulations of water freezing processes in cavities and cylindrical enclosures
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DOI：
10.1016/j.applthermaleng.2014.10.021
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发表时间：
2015-01
影响因子：
6.4
通讯作者：
A. Bourdillon;P. G. Verdin;C. Thompson
中科院分区：
文献类型：
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作者：
A. Bourdillon;P. G. Verdin;C. Thompson
基于对流和孔隙度的凝固求解器已经在开源CFD代码OpenFOAM中实现，以研究内部几何形状中的水冻结现象。一个多项式的水密度变化已被用于重力相关的条款。液体到固体的相变已占在能量和动量方程和水的体积分数已与温度函数在域中建模。本文中描述的模型已与商业或内部CFD代码获得的方形空腔和圆柱形外壳内的数值结果进行了比较。在可能的情况下，还将结果与实验测量结果进行了比较。该凝固求解器最终被扩展和修改，以创建一个新的配方来解释浆料和糊状区域。很明显，无论是使用凝固求解器还是新的浆料-糊状凝固求解器，都可以高精度地再现实验中观察到的物理现象。对于后者的模型，新形成的冰粒之间没有相互作用（浆区）和致密的冰和液体的混合物（糊状区域）之间的区别。这两个不同区域的正确建模对于碳氢化合物工业是必要的，例如，冷却油可以形成蜡凝胶。
Convection and enthalpy-porosity based solidification solvers have been implemented in the Open source CFD code OpenFOAM to study water freezing phenomena in internal geometries. A polynomial water density variation has been used for the gravity related terms. Liquid to solid phase changes have been accounted for in both energy and momentum equations and the water volume fraction has been modelled with a temperature function in the domain. The models described in this paper have been compared with numerical results obtained with commercial or in-house CFD codes for a squared shape cavity and inside a cylindrical enclosure. When possible, results have also been compared to experimental measurements. This solidification solver has finally been extended and modified to create a novel formulation to account for slurry and mushy regions. It appeared clearly that physical phenomena observed in experiments could be reproduced with high accuracy when using either the solidification solver or the new slurry–mushy solidification solver. For the latter model, a distinction is made between the newly formed ice particles not interacting with each other (slurry region) and the mixture of compact ice and liquid (mushy region). The correct modelling of these two distinct regions is necessary for hydro-carbon industries for instance, where cooling oil can form wax gels.