著者

羽鳥 彰一 宮内 敏雄

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.58, no.546, pp.463-470, 1992-02-25

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The SMAC method was improved by modifying the treatment of boundary conditions on free boundaries to simulate fluid flows with complicated free boudaries. This new method was applied to liquid flows in a tray-type distillation column, and the flow conditions for different locations of inlet flow were investigated. Good agreements were obtained between simulated results and experimental ones as to the liquid surface levels. The mechanism of downcomer flooding was also investigated and the following conclusions were obtained. The location of the inlet flow affects the condition of the main flow under the downcomer. In the case of the inlet flow falling down along the downcomer surface, the velocity of the main flow under the downcomer is not sufficiently recovered from the deceleration caused by the collision with the bottom. In this case, the downcomer disturbs the main flow and causes downcomer flooding at a large flow rate.