REU Supplement: Beds of Particles Fluidized by Liquids

本项目为流化床实验与分析项目。研究的主题是作为流化基本机制的尾迹和转动偶；流化床颗粒最可能排列方式的测定二维运动球面稳定横流阵列的实验与数值研究基于经验的流化悬浮液有效密度理论的发展和对颗粒的力分解为浮力加阻力；实验验证运动波的非线性理论，特别注意稀疏和压缩波的平滑和冲击作为Richardson和Zaki指数的函数；基于focolo和Gibilaro最近工作的概括，以及实验测试，分析了向聚集流化（气泡形成）的过渡。实验将以几个回流流化塔的结构和仪器为基础。柱的构造应使间隙大小可以改变。最小的间隙将把粒子的运动限制在二维空间。该仪器将基于柯达自旋物理高速视频和运动分析系统。这个视频与其他视频不同，因为它是基于数字成像的，并且有一个与计算机接口的规定。因此，解释图像可能需要的数据实际上以适合直接统计分析的数字化形式提供。

This project is for experiments and analysis of fluidized beds. The topics to be studied are wakes and turning couples as fundamental mechanisms of fluidization; determination of the most probable arrangements of fluidized particles in a bed; experimental and numerical studies of stable cross-stream arrays of spheres confined to move in two dimensions; development of an empirically based theory of the effective density of a fluidized suspension and the decompositions of the force on a particle into buoyancy plus drag; experimental verification of the nonlinear theory of kinematic waves with particular attention to smoothing and shocking of rarefaction and compression waves as a function of the Richardson and Zaki exponent; and the analysis of transitions to aggregative fluidization (formation of bubbles) based on generalizations of recent work of Foscolo and Gibilaro, together with experimental tests. The experiments are to be based on the construction and instrumentation of several return flow fluidization columns. The columns shall be constructed so that the gap size can be changed. The smallest gap will confine the motion of particles to two dimensions. The instrumentation is to be based on the Kodak Spin Physics high speed video and motion analysis system. This video is different than others in that it is based on digital imaging and there is a provision for interfacing with a computer. Hence, the data one might want for the interpretation of images is actually available in a digitized form suitiable for direct statistical analysis.