水平管道内冰浆流体阻力特性CFD模拟

Simulation of pressure drop for ice slurry flow in horizontal pipes by CFD

以水平管道内冰浆流体无相变流动过程为研究对象,运用计算流体力学(CFD)为工具,采用两相流双流体模型,研究了管道内冰浆流体阻力特性.结果表明,沿管道流动方向冰粒子浓度场滞后于其流场的充分发展.当存在湍动时,颗粒动力学理论模型可以很好地描述冰粒子间的剪切作用.当流动为层流时,基于Thomas方程的反推黏度模型的模拟效果优于前者.若浆体输送速度进一步降低,需对冰粒子间的剪切效应进行分段考虑.

To predict pressure drop of ice slurry flows in horizontal pipes,computational fluid dynamics（CFD）model for two fluids was applied without considering ice melting process.It can be seen that full development of ice particle concentration lags behind that of the velocity field in horizontal pipes.When modeling shear viscosity of ice particles,the granular kinetic theory is basically well adopted in turbulent flow region.However,for laminar flow,the inversed particle viscosity model based on the Thomas equation is accurate enough.If the flow velocity is further reduced,particle shear stresses should be separately modeled for each velocity range.