Solid flow in the annular region of a spouted bed
Solid flow in the annular region of a spouted bed
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DOI：
10.1002/aic.690350811
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发表时间：
1989-08
期刊：
影响因子：
3.7
通讯作者：
A. Benkrid;H. Caram
中科院分区：
文献类型：
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作者：
A. Benkrid;H. Caram
在不同的喷动条件下，研究了内径为 0.146 和 0.292 m 的半圆柱形和圆柱形空气喷动床的环形区域中的固体循环。采用频闪摄影、秒表和光纤方法测量环形区域的垂直粒子速度。光纤探头能够测量致密环形相内的粒子速度，并在壁上进行了验证。半床中的速度分布与全床中的速度分布非常不同。当时的工作仅限于满床。实验结果表明，固体流的特点是喷嘴入口处有一个点汇，固体在床层的较高位置几乎呈活塞流移动。沿着喷口壁的固体夹带可以忽略不计，并且在壁和喷口附近观察到缓慢的薄壁层。速度分布与床的总高度无关。运动学模型成功地描述了观测到的速度场。
The solid circulation in the annular region of a 0.146 and a 0.292 m ID semicylindrical and cylindrical air spouted beds was investigated for different spouting conditions. Stroboscopic photography, stopwatch and fiber optic methods were used to measure the vertical particle velocities in the annular region. The optical fiber probe enabled the measurement of particle velocities inside the dense annular phase and was validated at the walls. Velocity profiles in half beds were very different from those found in full beds. The work was then limited to full beds. Experimental results show that the solids flow is characterized by a point sink at the nozzle entrance with the solids moving almost in plug flow higher in the bed. There is negligible entrainment of solids along the spout wall and slow, thin wall layers are observed near the walls and spout. The velocity profiles are independent of the total height of the bed. A kinematic model successfully describes the observed velocity field.