Unsteady Motion in Pipe Flow of Gas-Solid Suspensions and Modeling

提出了一种研究管道中致密气固悬浮物非定常分层运动的方法。这是一种能量有效的流动形式，发生在相对较低的速度，但大于泥沙速度。将进行实验和理论相结合的研究。对平均参数和波动参数的测量，包括统计相关性，将在两个51毫米和127毫米的测试回路系统中进行。仪器开发包括用于速度测量的电晕充电探头。建立了分层流中波浪运动的基本方程。最后，提出了一种放大密集气固悬浮物水平输送结果的方法。研究结果可用于较低运行速度下气固悬浮输送系统的设计和规模扩大，对能耗、颗粒磨损和设备侵蚀有积极影响。

It is proposed to investigate the unsteady stratified motion of dense gas-solid suspensions in pipes. This is an energy efficient flow regime which occurs at relatively low velocities, but larger than the sediment velocity. A combination of experimental and theoretical studies will be undertaken. Measurements on mean and fluctuating parameters, including statistical correlations, will be performed in two test loop systems of 51 mm and 127 mm. The instrumentation development includes the corona charger probe for the velocity measurement. The basic equations for wave motion in stratified flow will be formulated. Finally, an approach to scale-up results obtained for horizontal conveying of dense gas-solid suspensions will be proposed. The results may be used for the design and scale up of gas- solid suspension transportation systems at relatively lower operation velocities, with positive effects on energy consumption, particle attrition and erosion of equipment.