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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

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