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The axial concentration distribution of both particles with better wetting (forming non-attached system) and poorer wetting (forming attached system) was investigated in a vertical gas-liquid-solid fluidized bed of 4.2 cm in diameter and 130 cm in height with the solids holdup less than 0.05. The one-dimensional sedimentation-dispersion model could be used satisfactorily to describe the axial distribution of solids holdup by modifying only a model parameter, i.e. by means of the terminal settling velocity minus a certain value, which is a function of gas velocity and considers the effect of an additional drag force resulted from attached rising bubbles. The axial profiles of solid concentration predicted are in good agreement with experimental results. This model also explains reasonably the different axial distributions of solid concentration, i.e. the solids holdup decreases as the axial height increases in non-attached system, but increases with the axial height in attached system at a given gas veloc 相似文献
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气液固流化床固体轴向浓度分布模型的研究进展 总被引:3,自引:0,他引:3
综述了描述气液固三相流化床中固体颗粒轴向浓度分布的沉降-分散模型和尾涡夹带机理模型,以及它们的推广与应用,同时指出这些模型在应用中的局限性。 相似文献
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重构状态的表示以及重构中相同子结构的搜索是产品重构规划研究的两项重要内容。可重构产品由模块构成,本文使用接口状态数与邻接关系图相结合的方法对模块的重构状态进行描述,考虑了模块接口的信息。基于此描述方法,改进子图同构的VF2算法,提出了一种适合产品重构的同构搜索算法,快速有效地搜索出产品重构中的相同子结构。同构搜索算法在Visual C 下实现,最后以可重构并联机器在不同构型间重构的实验作为例子验证了此方法。 相似文献
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