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An experimental study of a vertical tube gas-fluidized bed.

机译：立管式气体流化床的实验研究。

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摘要

The goal of this experimental work was to investigate methods of measuring important fluidization properties in a vertical, cold-flow, gas-fluidized bed to gain an understanding of the fluidization characteristics of the bed materials used. Quantities such as pressure drop across the bed, mean bed height, and minimum fluidization velocity were determined using non-invasive methods and were compared to fundamental fluidized bed theories to verify proper performance of the experiment. Granular temperature near the wall, a quantity of great interest in this system, was also determined using a non-invasive technique. An Acoustic Shot Noise probe, developed by Cody et al. (1996), was used to correlate the vibrational energy at the fluidized bed wall to the average particle velocity normal to this surface. By determining the mechanical transfer function of the confining tube, it was possible to obtain an estimate for the granular temperature near the wall by performing a spectral analysis of the wall acceleration time signal. Experimentally-determined values of pressure drop, mean bed height, and minimum fluidization velocity agreed well with the values predicted from theory. Average granular temperature values also agreed well with those obtained through similar means (Cody et al., 1996). The mean bed expansion ratio and average granular temperature results were compared with those obtained from a Computational Fluid Dynamics simulation (Didwania et al., to appear). Good agreement was observed between experiment and simulation, and special attention was given to the effects of changing key parameters in the model.
机译：这项实验工作的目的是研究在垂直，冷流，气体流化床中测量重要流化特性的方法，以了解所用床材料的流化特性。使用非侵入性方法确定数量（例如，穿过床的压降，平均床高度和最小流化速度），并将其与基本流化床理论进行比较，以验证实验的正确性能。还使用非侵入性技术确定了壁附近的颗粒温度，这是该系统中非常令人关注的数量。由Cody等人开发的“声散粒噪声”探头。 （1996），被用来关联在流化床壁的振动能量与垂直于该表面的平均粒子速度。通过确定约束管的机械传递函数，可以通过对壁加速时间信号进行频谱分析来获得壁附近的颗粒温度的估计值。实验确定的压降，平均床高和最小流化速度值与理论预测的值非常吻合。平均颗粒温度值也与通过类似方法获得的平均温度值非常吻合（Cody等，1996）。将平均床膨胀率和平均颗粒温度结果与通过计算流体动力学模拟获得的结果进行比较（Didwania等人出现）。实验和仿真之间观察到良好的一致性，并且特别注意了更改模型中关键参数的影响。

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  • 作者

    Mandich, Kevin Matthew.;

  • 作者单位

    University of California, San Diego.;

  • 授予单位 University of California, San Diego.;
  • 学科 Engineering Chemical.;Engineering Mechanical.
  • 学位 M.S.
  • 年度 2010
  • 页码 122 p.
  • 总页数 122
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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