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细颗粒与流体形成的均质或伪均质浆体,可以作为单相流体考虑水击问题.但对于含粗颗粒物料的固液两相流体,由于粗颗粒与流体跟随性较差,水击过程中动量传递特性与细颗粒差异较大;同时,粗颗粒孔隙中含有的气体在水击发生时可以产生较大的压缩变形,改变了颗粒的弹性模量,对水击特性有重要影响.基于浆体水击波速公式,利用试验数据得出粗颗粒与流体的跟随性计算公式,引入颗粒孔隙气体分数修正颗粒弹性模量,推导出了含粗颗粒物料在垂直管流中水击波速公式.将该公式计算结果与锰结核垂直提升管道实验水击波速实测结果比较,二者比较吻合.
The homogeneous or pseudo-homogeneous slurry formed by fine particles and fluid can consider the water hammer problem as a single-phase fluid, but for solid-liquid two-phase fluids containing coarse particles, since the coarse particles and the fluid follow poorly, During the process, the momentum transfer characteristics are quite different from the fine particles. At the same time, the gas contained in the coarse particles can generate large compressive deformation when the water hammer occurs, changing the elastic modulus of the particles, which has an important influence on the water hammer characteristics. Based on the formula of water hammer velocity of slurry, the followability formula of coarse particles and fluid was obtained by experimental data. Particle gas fraction was introduced to modify the elastic modulus of particles, and the formula of water hammer wave velocity of coarse particles in vertical pipe flow was deduced. The calculation results of this formula are in good agreement with the experimental results of water hammer wave velocity of vertical lifting pipeline of manganese nodules.