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CLC number: O359.1

On-line Access: 2017-03-07

Received: 2016-01-13

Revision Accepted: 2016-07-28

Crosschecked: 2017-02-07

Cited: 0

Clicked: 1425

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Zheng-liang Huang

http://orcid.org/0000-0002-8457-6394

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Journal of Zhejiang University SCIENCE A 2017 Vol.18 No.3 P.212-224

http://doi.org/10.1631/jzus.A1600016


Numerical simulation of gas-liquid flow through a 90° duct bend with a gradual contraction pipe


Author(s):  Dong-fang Hu, Zheng-liang Huang, Jing-yuan Sun, Jing-dai Wang, Zu-wei Liao, Bin-bo Jiang, Jian Yang, Yong-rong Yang

Affiliation(s):  State Key Laboratory of Chemical Engineering, College of Chemical and Biochemical Engineering, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   huangzhengl@zju.edu.cn

Key Words:  90°, duct bend, Contraction, Computational fluid dynamics (CFD), Uniform distribution, Hydrodynamics


Dong-fang Hu, Zheng-liang Huang, Jing-yuan Sun, Jing-dai Wang, Zu-wei Liao, Bin-bo Jiang, Jian Yang, Yong-rong Yang. Numerical simulation of gas-liquid flow through a 90° duct bend with a gradual contraction pipe[J]. Journal of Zhejiang University Science A, 2017, 18(3): 212-224.

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author="Dong-fang Hu, Zheng-liang Huang, Jing-yuan Sun, Jing-dai Wang, Zu-wei Liao, Bin-bo Jiang, Jian Yang, Yong-rong Yang",
journal="Journal of Zhejiang University Science A",
volume="18",
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pages="212-224",
year="2017",
publisher="Zhejiang University Press & Springer",
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A1 - Zu-wei Liao
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A1 - Jian Yang
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Abstract: 
The effect of a gradual contraction pipe (GCP) on gas-liquid flow in a circular-sectioned horizontal to vertical 90°; duct bend was investigated by computational fluid dynamics (CFD) simulation. The hydrodynamics of gas-liquid flow in 90°; duct bends with and without a GCP in the vertical section were compared using a 3D steady Eulerian-Eulerian approach. The predicted static pressure in the vertical section of the pipes and the pressure drop in the whole pipe were consistent with experimental data. Results of simulations showed that liquid could distribute more uniformly at the exit of the pipe with a GCP. The increased uniformity was accompanied by an increase in pressure drop by a factor of less than 10% compared to the pipe without a GCP. The position of minimum pressure in the bend was changed by the GCP. A GCP can alter the trajectories of the fluid and secondary flow. As a result, the fluid can quickly reach a steady state downstream from the bend.

In this paper, the hydrodynamics of gas-liquid flow through 90˚ duct bend have been simulated and the effects of pipe contraction downstream the bend are studied in comparison with the pipe with no contraction. To do so, a three dimensional steady Euilerian approach is used and liquid distribution along the pipe cross section and length is studied.

模拟研究气液两相在带缩径管的90°弯管内的流动

目的:90°弯管广泛应用于工业中的流体输送,但是流体在经过弯头时会由于离心力的作用而导致弯头下游管道内出现流体分布不均的现象,从而影响后续的生产过程。本文将实验和计算流体力学(CFD)模拟的方法结合研究缩径管对经过弯头后的流体整流作用并分析原因,以期为缩径管在工业中的应用提供一定的参考。
创新点:1. 提出在弯头后的管路中增加缩径管来调整流体的方法;2. 在冷模实验数据验证模拟结果的正确性的基础上,根据CFD模拟得到的管道内的压力、流体速度、相分布及湍动能分布详细分析了缩径管能起整流作用的原因。
方法:1. 通过冷模实验所得的压力数据与模拟值进行对比,证明模拟所采用模型的正确性;2. 通过对不同流体入口条件模拟结果的比较,找到缩径管的作用规律;3. 通过CFD模拟得到管道内的压力、流体速度、相分布及湍动能,分析缩径管的整流原理。
结论:1. 模拟所采用的模型可较好地反映管道内的流体流动情况;2. 缩径管能起到很好的整流效果;3. 缩径管可使流体加速,促进流体的快速混合,因此能够使不稳定的流体快速达到稳定状态。

关键词:90°弯管;缩径管;CFD;均匀分布;流体力学

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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