基于Eulerian模型的三维立式脱水沉降罐数值模拟

The Numerical Simulation of 3D Vertical Dehydration Sedimentation Tank with The Multiphase Eulerian Model

利用计算流体力学（CFD）分析软件ANSYS（FLUENT）的多相流Eulerian模型对三维立式脱水沉降罐油水分离过程进行了非稳态数值模拟，同时使用用户自定义函数（UDF）编写流体物性值随温度的变化关系。从模拟结果中观察了温度场、体积分数和流场的细节特征，结果发现，配液管温度、油相体积分数影响配液孔流速；进液温度在60～80℃时，较高的温度总是有利于油水分离；罐内油相速度在乳化层处扩散。

The process of oil-water separation in a 3D vertical dehydration sedimentation tank model was calculated by CFD （Computational Fluid Dynamics） code ANSYS （FLUENT） with Multiphase Eulerian Model. The physical properties of both oil and water were determined by UDF （User Define Function）. The details of temperature filed, volume fraction of oil and flow field were observed. It was shown that oil temperature and volume fraction had large effects on velocities of distributor hole; higher mixture fluid temperature were more beneficial for oil-water separation between 60 ℃ and 80 ℃; the velocity field was diffused under the interlayered emulsion. The conclusions of simulation had guiding sense to the design and production of dehy- dration.