水平管道内冰浆流动阻力特性预测模型及比较

为研究水平管道内冰浆流体流动阻力特性，采用两相流混合模型，对不同工况下浆体所表现出的牛顿与非牛顿流变特性给予分段考虑，通过计算流体力学（CFD）模拟方法再现了水平管道内冰浆流体等温流动过程。研究结果表明，当浆体输送速度较高时，Thomas方程可很好地刻画出混合相流体的粘度特性。随着浆体速度降低，利用Bingham流变模型来刻画低速工况下混合相流体的流变特性可获得更为理想的效果。通过对比数值模型及现行实验关系式阻力模型发现，数值计算模型因能综合考虑管道压降的多种影响因素，模型的精度与通用性可得到较好的平衡。文中所验证的4组工况中，数值模型的预测值与实验值间的相对误差均可控制在±15％内。

Numerical Modeling of Ice Slurry Flow Pressure Drop in Horizontal Pipes

To predict pressure drop of ice slurry flow in horizontal pipes, a mixture CFD model was applied to simulate the two-phase flow without considering ice melting. Based on the specific flow features, the Newtonian and non-Newtonian rheological expressions were employed respectively. It is found that in high speed the Thomas viscosity equation behaves well in representing the mixture fluid viscosity; whereas in low speed the Bingham model is more suitable for describing the mixture fluid rheology. Compared with the published pressure drop correlations, the current numerical model can involve with various factors and has a good balance between precision and suitability. The results of numerical model are in excellent agreement with the experimental data and the relative errors are limited to ±15 %.