基于剪切技术的重油乳化过程三维流场数值模拟

Three-dimensional flow simulation of a heavy oil emulsification process based on shearing technology

应用计算流体力学软件FLUENT的RNGk-ε湍流模型以及基于欧拉法的MIXTURE二相流模型,对高剪切均质机乳化重油时的流场进行三维数值模拟。分析一对定转子齿间的压力场和速度场,讨论在不同的转速和定转子齿隙下剪切率的变化情况。分析表明,通过改变转速和齿隙可以有效地提高其剪切率,使水以较小的微粒均一地分散到重油中,从而提高乳化重油的稳定性,以扩大乳化重油的使用范围。

A three-dimensional flow field for emulsified heavy oil in a high shearing homogenizer has been derived by applying the RNG k-ε turbulent model and the MIXTURE model of two-phase flow in the computational Fluid Dynamics software FLUENT. The force-field and velocity-field between a pair of stator-rotor gears with a fixed angular velocity has been analyzed, and the variation in shear strain rate with different stator-rotor clearances and different velocities has been investigated. The numerical simulations allow the shear strain rate of a high shearing homogenizer to be increased by optimizing the clearance and angular velocity. Under optimum conditions, water is.dispersed into fairly small particles by the stator-rotor and these can diffuse evenly into the heavy oil. The enhanced stability of the resulting emulsified heavy oil leads to a greater range of potential applications for this material.