Two-phase slug flow across small diameter tubes with the presence of vertical return bend
Two-phase slug flow across small diameter tubes with the presence of vertical return bend
复制标题
DOI：
10.1016/j.ijheatmasstransfer.2004.12.036
复制
发表时间：
2005-05
影响因子：
5.2
通讯作者：
Chi-Chuan Wang;I. Chen;Pi-Shan Huang
中科院分区：
文献类型：
--
作者：
Chi-Chuan Wang;I. Chen;Pi-Shan Huang
本研究考察了两相段塞流在存在垂直u型回弯的小直径管中的流动。气流通过回弯的平动速度通常在π/ 2-3π /4角处达到峰值。当流体从曲率比较小的下管进入时，平动速度的增加尤为明显。在曲率比为3时，观察到段塞速度增加了大约两倍。提出了平均偏差为18.7%和24.5%的向上和向下流动的无因次相关关系，可以描述回弯内平动速度的变化。
This study examines the two-phase slug flow across small diameter tubes with the presence of vertical U-type return bends. The translational velocity of the air slug across return bend usually peaks at an angle of π/2–3π/4. The increase of translational velocity is especially pronounced when flow enters at the lower tube with a smaller curvature ratio. An approximately twofold increase of the slug velocity is observed at a curvature ratio of 3. Dimensionless correlations for flowing upwards and downwards with a mean deviation of 18.7% and 24.5% are proposed that can describe the variation of translational velocity within the return bend.