海底水力输矿管固液两相流的数值模拟

传统的固液两相流数值模拟方法是将固体颗粒(和液体)作为高密度的液体流处理,这只适用于固体颗粒非常细小的情况如粮食输送、泥沙输送等。对海底采矿的水力输送问题,由于固体颗粒相对于水粒子非常庞大,再作为传统的固液两相流处理不科学。本文对矿石颗粒采用离散元方法、对水粒子采用Fluent方法,并将两者耦合进行固、液耦合流在竖向弯管的流动特性研究,考察了不同入口流速下流体的运动规律和矿石颗粒的运动规律和分布规律。结果表明：由于矿石颗粒堆积在管道底部,导致管道内顶部的水流速度大,底部的水流速度小；随着水流速度的降低,矿石颗粒的堆积效果也更加明显；同时存在某一特定速度,使得其开采效率达到最大。

Numerical simulation of solid-liquid two-phase in subsea pipeline

The solid particles are seemed as the quasi-fluid in the conventional numerical simulation of solid-liqiud two-phase and this method is able to be utilized to simulate the transportation of the slurry. For the minerals which size is much larger than the fluid particles and can not be seemed as the quasi-fluid. The solid phase calculated by dem and the fluid phase calculated by fluent are presented in this paper. The results show that the velocities of fluid on the top of the pipe wall bigger than that of fluid on the bottom of the pipe wall. The water pressure decrease alot due to the accumulation of the mineral particles. The exist of particular inlet velocity can make the maximum mining efficiency.