Impact of Internals on the Heat-Transfer Coefficient in a Bubble Column
Impact of Internals on the Heat-Transfer Coefficient in a Bubble Column
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DOI：
10.1021/ie2018096
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发表时间：
2012-02
影响因子：
4.2
通讯作者：
Rahman S. Abdulmohsin;M. Al-Dahhan
中科院分区：
文献类型：
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作者：
Rahman S. Abdulmohsin;M. Al-Dahhan
在直径为0.19m的鼓泡塔中，研究了换热内件对传热系数的影响。使用空气-水系统，表观气体速度从3到20 cm/s变化，其涵盖气泡和搅动湍流两种流型。实施了堵塞0%（空塔）、5%（模拟甲醇合成）和22%（模拟费托合成）塔横截面积的内部构件。利用快速响应的传热探头测量了充分发展流动区域的传热系数径向分布。结果表明，在相同的实际气体速度的基础上的开放的横截面积的高比例的内部构件的存在下，导致传热系数的增加。此外，传热系数随着气体速度的增加而增加。所有工况下塔中心的传热系数均大于塔壁附近的传热系数。
The effect of heat exchanging internals on the heat-transfer coefficient has been investigated in a 0.19 m diameter bubble column. An air–water system was used with superficial gas velocities varying from 3 to 20 cm/s, which cover both the bubbly and churn-turbulent flow regimes. Internals occluding 0% (empty column), 5% (simulating methanol synthesis), and 22% (simulating Fischer–Tropsch synthesis) of the column cross-sectional area were implemented. A fast response heat-transfer probe was utilized to measure the radial profile of the heat-transfer coefficient in the fully developed flow region. The results indicate that the presence of a high percentage of internals causes an increase in the heat-transfer coefficient at the same actual gas velocity on the basis of the open cross-sectional area. Also, the heat-transfer coefficient increases with an increase in the gas velocity. The heat-transfer coefficients in the column center for all of the studied conditions are larger than those near the wall of the...