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Research on Flow Control of Dense Gas-Solid Flows

稠密气固流流动控制研究

基本信息

批准号：
13450075
负责人：
TSUJI Yutaka
金额：
$ 9.92万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450075/
关键词：
multi-phase flow gas-solid flow fluidized bed standpipe flow flow control

项目摘要

The objective of this study is the control of meso-scale structures in dense gas-solid flows, First, the effect of gas pulsation on the bubble motion in a fluidized bed was investigated numerically and experimentally. It was found both in the calculation and the experiment that characteristic bubbles were generated when the injected gas velocity was pulsated at a certain frequency band. When the pressure drop through the gas distributor was considered the calculated bubble motion agree with that in the corresponding experiment. Gas pulsation is one of the promissing ways to control the bubble motion in the fluidized bed, and the calculation taking account of the pressure drop through the gas distributor can predict the effect of the gas pulsation on the bubble motion.Next, the plug motion in a standpipe flow was studied. When the drag coefficient is modified taking account of the wall effect the predicted pulg length and the plug velocity agree well with those in the corresponding experiment. The length, velocity, frequency of breakup of plugs are investigated statistically by using the calculated results. A plug flow model for a one-dimensional steady standpipe flow was proposed.Finally, a similarity model was proposed, in which the motion of particles are simulated by using larger model-particles. The similarity model was applied to the numerical simulation of a fluidized bed, and the effect of the model-particle size on the bubble motion was investigated.

本文以稠密气固两相流中的细观结构控制为研究目标。首先，对流化床中气体脉动对气泡运动的影响进行了数值模拟和实验研究。计算和实验都发现，当喷射气体速度在一定频率范围内脉动时，会产生特征气泡。当考虑气体分布器的压降时，气泡运动的计算结果与相应的实验结果相吻合。气体脉动是控制流化床中气泡运动的有效方法之一，考虑气体分布器压降的计算可以预测气体脉动对气泡运动的影响。其次，研究了立管流动中的塞状运动。当考虑壁面效应对阻力系数进行修正后，预测的泥塞长度和泥塞速度与相应的实验结果吻合较好。根据计算结果，统计分析了栓塞的长度、速度、破碎频率等参数。建立了一维稳态立管流动的塞流模型，提出了用较大的模型颗粒模拟颗粒运动的相似模型。将相似模型应用于流化床的数值模拟，考察了模型颗粒尺寸对气泡运动的影响。