Engineering Initiation Award: Multiphase Flow Facility

工程启动奖：多相流设施

• 批准号: 8707843
• 负责人: Davood Moslemian
• 金额: $ 7.39万
• 依托单位: Florida Atlantic University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-08-01 至 1990-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8707843&HistoricalAwards=false
• 关键词: Engineering; Initiation; Award; Multiphase; Flow

Narrative: Knowledge on solids circulation, mixing and their relation to heat transfer in a fluidized bed is of critical importance to the design of fluidized bed combustors and chemical reactors and to the development of a rational procedure for scale- up. To date systematic, quantitative data on the subject have been limited. Accordingly, it is proposed to design and build a radioactive particle tracking facility in order to study the hydrodynamics, mixing, segregation and heat transfer in atmospheric and pressurized fluidized beds. This versatile facility makes use of radioactive tracer particles which are dynamically identical to the particles to be studied. The motion of the tracer particles is tracked by an array of scintillation detectors and analyzed by an on-line computer. The solids velocity and occurrence probability of any particular species of particles can be obtained by using a tracer which matches their density, size, and shape. The results are expected to contribute to the formulation of the scaling laws for fluidized bed design. The proposed investigation will include: (1) Construction of a 12-inch diameter bed, (2) Measurements of mean and fluctuating components of solids motion, (3) Measurements of particle size and density segregation, (4) Measurements of solids mixing, (5) Influence of bed hydrodynamics on heat transfer to or from immersed surfaces and (6) Measurements of the hydrodynamics of solids in pressurized fluidized beds.

叙述：关于固体循环、混合及其 在流化床中， 流化床燃烧器和化学品设计的重要性 反应器，并制定一个合理的程序规模- 起来 迄今为止，关于这一问题的系统的定量数据已经 有限公司 因此，建议设计和建造一个 放射性粒子跟踪设施，以研究 大气中的流体力学、混合、分离和传热 和加压流化床。 这种多功能设施利用了 放射性示踪粒子，其动态地与 要研究的粒子。 示踪剂粒子的运动由一个阵列跟踪， 闪烁检测器，并通过在线计算机进行分析。 的 固体的速度和发生概率的任何特定的 粒子种类可以通过使用示踪剂来获得，所述示踪剂 与它们的密度大小和形状相匹配 结果预计 为流化床的标度律的制定做出贡献 床的设计 拟议的调查将包括：（1） 12英寸直径床的建造，（2）平均 固体运动的脉动分量，（3）测量 粒度和密度偏析，（4）固体测量 （5）床层流体动力学对传热的影响 浸没表面和（6）固体流体力学的测量 在加压流化床中。