Unsteady Motion in Pipe Flow of Dense Gas-Solid Suspensions REU Supplement

稠密气固悬浮液管流中的非定常运动 REU 补充

• 批准号: 8709974
• 负责人: Shao Soo
• 金额: $ 23.38万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-01 至 1991-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8709974&HistoricalAwards=false
• 关键词: Unsteady; Motion; Pipe; Flow; Dense

Narrative: Unsteady stratified motions have been observed in dense gas-solid suspensions at moderate and low velocities, but means for prediction are lacking. This flow range is significant because it is energy efficient for processing and transport of solids and because it tends to minimize attrition of solids and erosion of equipment. With test loop systems of 2-inch and 5-inch pipe diameters capable of continuous recycling of solids, a minimum investment of solid material is needed for prolonged test runs. The large pipe especially makes possible detailed observation and measurements. A preliminary study showed that wave motion and phase interactions at a low velocity can be directly observed, and comparison to simple wave analysis can be made. At moderate velocities and large particle densities, measurement of wave motion in terms of a spectrum based on autocorrelation of probe current or local mass flow was feasible. The proposed research includes further work on basic formulation and transport properties, and definitive measurements over a range of unsteady horizontal pipe flow at first. Both auto and cross- correlations will be determined at various positions in the pipe over a range of flow conditions and particles. The aim is toward prediciton of flow conditions and scale-up of designs.

叙述：在稠密的大气中观察到不稳定的分层运动。 气固悬浮在中等和低速度，但手段， 缺乏预测。 这个流量范围很重要，因为它 对于固体的处理和运输是节能的， 因为它倾向于最小化固体的磨损和 设备. 带有2英寸和5英寸管道的测试回路系统 直径能够连续回收固体，最小 长期试运行需要固体材料的投资。 大管道尤其使得详细观察成为可能， 测量. 初步研究表明，波动和相位相互作用 可以直接观察到，与简单的 可以进行波形分析。 在中等速度和大 颗粒密度，用a测量波动 基于探针电流或局部质量自相关的光谱 流量是可行的。 拟议的研究包括进一步研究基本配方， 传输特性，并在一定范围内进行确定性测量， 非定常水平管流。 自动和交叉- 将在管道中的各个位置处确定相关性 在一定范围的流动条件和颗粒上。 目的是为了 预测流动条件和扩大设计规模。