水平管道内冰浆流动阻力特性实验研究

Experimental investigation into the properties of flowing resistance of ice slurry inside a horizontal pipeline

冰浆是一种能量密集型相变流体,掌握管道内冰浆的流动特性对于冰浆介质的工程推广尤为关键。以水平管道冰浆输送系统为研究对象,基于固液两相流非牛顿流变理论和实验测试相结合的方法,研究了在不同输送速度、不同冰粒子浓度及不同管径时冰浆流体所表现出的非牛顿流变特性和阻力特性。研究结果表明,冰浆流动的流变特性满足幂律流变特征,其流变系数随着冰粒子浓度及管道直径的增大而增大,而流变指数的变化规律则与流变系数相反。与此同时,流变参数的改变直接影响冰浆流动的阻力特性分布。当流速较低时,随着流变系数的增大及流变指数的减小,冰浆流体管道流动的阻力系数表现出显著的差异性。

Ice slurry is a kind of energy-intensive phase change fluid, and knowing the flowing properties of ice slurry is of paramount importance to engineering applications. With the ice slurry conveying system inside a horizon-tal pipeline as the research object, by the combination of the solid and liquid two-phase flow non-Newtonian rheo-logical theory and experimental testing, the non-Newtonian rheological property and resistance property shown by the ice slurry under such conditions as different conveying speeds, different concentration of ice particles and differ-ent pipe sizes are researched. The research results reveal the following conclusions：the rheological properties of ice slurry flow meet the power-law rheological characteristics, the rheological coefficient increases with the increase of ice particle concentration and pipe diameter, while the rheological index will present the opposite variation law. Meanwhile, the variation of the rheological parameters directly affects the distribution of the resistance properties of ice slurry flow. When the flow speed is low, following the increase or decrease of the rheological coefficient, the re-sistance coefficients of ice slurry flow inside the pipeline show a significant difference.