• 流动与传递 •

### 90°圆截面弯管内稠油流动特性分析

1. 中国石油大学(华东)石油工程学院，山东 青岛 266580
• 收稿日期:2018-03-22 修回日期:2018-05-29 出版日期:2019-02-22 发布日期:2019-02-12
• 通讯作者: 张黎明 zhangliming@upc.edu.cn

### Numerical simulation on flow characteristics of heavy oil through circular-sectioned 90° bends

Xiaoyuan GU, Fukui PAN, Wenjie WANG, Liming ZHANG*

1. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
• Received:2018-03-22 Revised:2018-05-29 Online:2019-02-22 Published:2019-02-12
• Contact: Ming LiZHANG zhangliming@upc.edu.cn

Abstract: The flow of heavy oil in circular-sectioned 90° bends was investigated. The local hydrodynamic performance was affected by heavy oil flow parameters and structure parameters of bend. Computational fluid dynamics (CFD) was used to numerical calculate the three-dimensional laminar flow for circular-sectioned 90° bends, and heavy oil was used as the research medium. The resistance of heavy oil was exported at temperature 50~70℃, Reynolds number 300~800, the inner diameter of pipe D=50.7~131.7 mm, bending ratio B=0.75~3.0. The mechanism of the local drag coefficient in bend was analyzed. The results showed that the local drag coefficient increased with the increase of temperature, the inlet Reynolds number decreased and D increased. The resistance decreased in the range of 0~15° in the bend because of the formation of double longitudinal vortices, and the scope of resistance decreased from 75° in the bend to 0.5D behind the bend because of the formation of four longitudinal vortex bend. The effect of local flow resistance was greater by bending ratio than the other. The maximum value of the local drag coefficient when B=0.75 was 28.35 times of that of B=3.0, however, the pipeline resistance between inlet and outlet was only 1.68 times. The reason was that there was a local low pressure region at 1.0D behind the bend when the bending ratio B≤1.0. Meanwhile, there was a flow vortex, and the peak of shear rate located 0.5D behind the bend. The conclusions can provide technical support, and the theoretical study about the secondary flow characteristics of heavy oil in the pipe can provide reference data for the design of heavy oil pipeline. The initial state parameters of heavy oil can be predicted in the engineering practice.