Spatio-temporal evolution of void fraction in liquid–solid inverse fluidized bed
Spatio-temporal evolution of void fraction in liquid–solid inverse fluidized bed
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DOI：
10.1016/j.ces.2006.08.056
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发表时间：
2007
影响因子：
4.7
通讯作者：
T. Renganathan;K. Krishnaiah
中科院分区：
文献类型：
--
作者：
T. Renganathan;K. Krishnaiah
通过实验研究了液体速度阶跃变化下逆流化床（IFB）的非定常空隙率特性。在文献中首次研究了IFB中空隙率的时空演化。实验结果可以用现有的理论来解释。由Foscolo和Gibilaro[1987]提出的颗粒床模型。流态化悬浮液的流体动力学稳定性：颗粒床模型。化学工程，42(6),1489-1500。]用于预测孔隙率的实验时空变化，以及床面和孔隙界面的时程。总体而言，实验结果与模型预测结果吻合较好。对非稳态条件下的滞回现象也作了解释。
Experiments were conducted to investigate the unsteady state void fraction characteristics of inverse fluidized bed (IFB) subjected to step change in liquid velocity. The resulting temporal and spatial evolution of void fraction in IFB is studied for the first time in the literature. The experimental profiles could be explained by the existing theories. The particle bed model proposed by Foscolo and Gibilaro [1987. Fluid dynamic stability of fluidized suspensions: the particle bed model. Chemical Engineering Science 42(6), 1489–1500.] is used to predict the experimental spatio-temporal variation of void fraction, and the time history of bed surface and voidage interface. In general, a good agreement is obtained between the experimental results and model prediction. The hyteresis phenomenon occurring during unsteady state conditions is also explained.