Transient three-dimensional numerical analyses of shallow bubble column
Transient three-dimensional numerical analyses of shallow bubble column
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DOI：
10.1016/s1385-8947(99)00154-0
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发表时间：
2000-07
影响因子：
15.1
通讯作者：
K. Kuwagi;Sunao Kusu;H. Ozoe
中科院分区：
文献类型：
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作者：
K. Kuwagi;Sunao Kusu;H. Ozoe
研究了浅气泡塔（半径等于高度）中的两相流。主要目标是研究自由表面对整个流动模式的影响以及整个域的三维性。通过圆柱形水箱的中心多孔底壁注入气泡。通过分散的铝颗粒使流动模式可视化。用激光多普勒测速仪测量液相的速度。使用分散流模型对该系统进行了数值分析。动量方程中的惯性项通过 QUICK 格式进行近似。采用两种顶面模型，即滑动或非滑动条件。防滑条件下的计算结果与实验结果吻合较好。对顶水面进行了防滑条件下的三维计算。与二维计算相比，计算的流动模式与实验模式更加吻合。结果发现，在中心向上流的外部发现了两个垂直运动的螺旋涡。尽管容器很浅，但流动却具有很强的三维性。
Two-phase flow in a shallow bubble column (radius equal to the height) was studied. The primary objectives were to study both the effect of the free surface on the whole flow mode and the three-dimensionality in the whole domain. Air bubbles were injected through a central porous bottom wall of a cylindrical water tank. The flow pattern was visualized with dispersed aluminium particles. The velocity of the liquid phase was measured with a laser-Doppler velocimeter. The system was numerically analysed with a dispersed flow model. The inertial terms in the momentum equations were approximated by the QUICK scheme. Two models for the top surface were employed, namely either slip or non-slip conditions. The computed result with non-slip conditions agreed fairly well with the experimental result. A three-dimensional calculation was carried out with non-slip conditions for the top water surface. The calculated flow pattern agreed better with the experimental pattern than the two-dimensional calculation. In the results, two spiral vortices moving vertically were found outside the central upward flow. The flow was strongly three-dimensional, even though the vessel was shallow.