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首页> 外文学位 >An experimental study of particle characterization and fluid-particle interaction in two-phase gas-solid transport: A hybrid study of dilute phase gas-solid transport in horizontal pipe. (Volumes I and II).
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An experimental study of particle characterization and fluid-particle interaction in two-phase gas-solid transport: A hybrid study of dilute phase gas-solid transport in horizontal pipe. (Volumes I and II).

机译：两相气固传输中颗粒表征和流固耦合的实验研究：水平管中稀相气固传输的混合研究。 （第一和第二卷）。

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This work summarizes experimental studies of dilute-phase horizontal gas-solid transport of food grains in 4-inch i.d. pipe. It outlines the design and experimental development of a small industry/laboratory pneumatic conveying system to: (1) Establish conveying parameters for bulk materials (2) present information on the nature of two-phase dilute gas-solid flow for modelling and designing an optimum solid transfer system for classical academic researchers, and practicing engineers.; Sufficient and necessary basic data was collected on (1) air-solid velocity measurements around bends and in straight pipe based on multi-position pitot tube measurements at cross-sections of the conveying line. (2) photographic observations of particle dynamics, and (3) particle characterization applied to gas-solid horizontal transport for future theoretical modeling.; A method of measuring particle size and shape is detailed and used to study the performance of particles and their close relationship to the general transport process in two-phase horizontal gas-solid transport.; Solid flow characteristics were sensitive to experimental conditions and affected by the Fourier particle diameter, density, and mass flow ratio of air and grain particles. The velocity profile of air in the pipe was asymmetric with respect to the pipe axis and affected by adding particles.; The lowest limit of velocity in dilute-phase gas-solid horizontal transport was found. The Fourier equivalent radius R{dollar}sb{lcub}rm O{rcub}{dollar} in combination with the saltation velocity correlation of Zenz distinguished between materials more easily transported for safe conveying. All materials exhibited unsteady flow rather than the fully suspended flow. Unsteady flow was not observed as often in common rice varieties with aerodynamic shapes as it was in beans, sweet brown rice, and tapioca. The experimental actual air and/or air-solid mixture velocity approximated Zenz's saltation and Siegler's critical velocities, taking into account Fourier equivalent size in calculating Drag coefficients by the Pettyjohn and Christiansen method.
机译：这项工作总结了在4英寸内径中食品相的稀相水平气固运移的实验研究。管。它概述了小型工业/实验室气动输送系统的设计和实验开发，以：（1）建立散装物料的输送参数（2）提供有关两相稀气固流性质的信息，以进行建模和设计最佳方案面向经典学术研究人员和实践工程师的可靠转学系统。基于（1）弯管周围和直管中的气固速度测量，基于传输线横截面的多位置皮托管测量，收集了足够和必要的基本数据。 （2）颗粒动力学的摄影观察，以及（3）应用于气固水平传输的颗粒表征，以用于将来的理论建模。详细介绍了一种测量颗粒尺寸和形状的方法，并用于研究颗粒的性能及其与两相水平气固输送中一般输送过程的密切关系。固体流动特性对实验条件敏感，并受空气和谷物颗粒的傅立叶粒径，密度和质量流量比的影响。管中空气的速度分布相对于管轴是不对称的，并受添加颗粒的影响。发现了稀相气固水平输送的最低速度极限。傅立叶当量半径R {dollar} sb {lcub} rm O {rcub} {dollar}与Zenz的盐化速度相关性相结合，区分了更容易运输以安全运输的物料。所有物料均表现出不稳定的流动而不是完全悬浮的流动。在具有空气动力学形状的普通水稻品种中，豆类，糙米和木薯中没有观察到不稳定的流动。在用Pettyjohn和Christiansen方法计算阻力系数时，考虑到傅立叶当量尺寸，实验的实际空气和/或气固混合物速度近似于Zenz的盐化作用和Siegler的临界速度。

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