Vortex Street Characteristics of Two-phase Flow with Low Gas Fraction

LI Jinxia; WANG Chao; DING Hongbing

doi:10.3901/JME.2017.20.161

Journal of Mechanical Engineering >

2017 , Vol. 53 >Issue 20: 161 - 168

DOI: https://doi.org/10.3901/JME.2017.20.161

Vortex Street Characteristics of Two-phase Flow with Low Gas Fraction

LI Jinxia ,
WANG Chao ,
DING Hongbing

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1. School of Electrical and Information Engineering, Tianjin University, Tianjin 300072;
2. Tianjin Key Laboratory of Process Measurement and Control, Tianjin University, Tianjin 300072

Received date: 2016-09-02

Revised date: 2017-03-09

Online published: 2017-10-20

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Abstract

Gas-liquid two-phase vortex street widely exists in productions, which is rather complicated due to the complex phase-interactions. Numerical simulations and real flow experiments are carried out to study the gas effects to two-phase vortex street in low gas fraction of horizontal pipeline. A 3-D computational fluid dynamics(CFD) modeling is carried out to simulate the gas-liquid two-phase flow around a bluff body using a volume of fluid (VOF) mutli-phase model and RNG k-e turbulence model. The simulation results indicate a good consistency with experiments in the quantitative frequency. Combined with simulation and experimental results, the two-phase vortex street characteristics of different gas fractions are studied from the near wake flow field and vortex topology, the Strouhal number two perspectives. The results indicate that under stable vortex street, the dominant length of stagnant region increases with gas fraction, which leads to the linear decrease of Strouhal number; Meanwhile, the periodicity and signal quality of vortex street deteriorate, and the energy of vortex street reduces, this is because the air bubbles of small density and high speed are trapped by vortex core, which results in the reduction of vortex rotational energy, and further influences the stability of vortex street.

Key words： gas-liquid two-phase flow; vortex street; Strouhal number; CFD; vortex topology; gas effect

Cite this article

LI Jinxia , WANG Chao , DING Hongbing . Vortex Street Characteristics of Two-phase Flow with Low Gas Fraction[J]. Journal of Mechanical Engineering, 2017 , 53(20) : 161 -168 . DOI: 10.3901/JME.2017.20.161

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