Effect of swirl flow on the bubble motion and spatial distribution in a venturi tube

Bie, Haiyan; Li, Yang; Zhang, Ruihan; Xue, Licheng; Liu, Gang; Hao, Zongrui

doi:10.1016/j.cej.2023.148341

Cited by 1 publication

(2 citation statements)

References 36 publications

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“…Based on the investigation of the turbulence model, it was found that the standard k– ε model is suitable for calculating the flow field of the VMG, while RSM ,,, is suitable for calculating the flow field of the SVMG. In order to make the calculated results reflect the flow field information more accurately, the calculated pressure drops of the three turbulence models are compared with the experimental pressure drops, as shown in Table .…”

Section: Cfd Methodologymentioning

confidence: 99%

“…Bie et al 21 used two high-speed cameras to capture the three-dimensional (3D) movement process and breakup phenomenon of bubbles in a swirl-Venturi microbubble generator. In a subsequent study, 22 they further measured the spatial position of individual bubbles and the spatial distribution of bubble clusters and found that with a decrease in bubble size, the spatial distribution range of bubble clusters in the divergent section was expanded, which enhanced the contact between the gas and liquid. There are few reports on the enhancement of liquid−liquid breakup by the swirling flow field, but some studies have shown that the introduction of the swirling flow field can promote liquid−liquid dispersion.…”

Section: Introductionmentioning

confidence: 99%

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Performance Evaluation and Scale-up of the Swirl-Venturi Microdroplet Generator

Xu,

Shuai,

Yang

et al. 2024

Ind. Eng. Chem. Res.

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The droplet generator is a key piece of equipment to strengthen the liquid−liquid reaction process. Studies have shown that the swirl-Venturi microbubble generator (SVMG) has a good microbubble generation effect. Based on this idea, a swirl-Venturi droplet generator is designed. The parameters of the SVMG, such as pressure drop, droplet size distribution, and liquid volume mass transfer coefficient k L a, are measured in a white oil−water system using the pressure difference, high-speed camera, and concentration tracer methods. First, combined with the CFD simulation, a strong internal circulation flow in the SVMG is found, which leads to a pressure drop of 25−34 times that of the traditional Venturi generator at the same flow rate, and the pressure drop model of the SVMG is established. Second, the Sauter average size d 32 of the droplets produced by the SVMG decreases with an increase of the Reynolds number of the continuous phase or a decrease of the Reynolds number of the dispersed phase. Considering the Reynolds number, flow rate, input power, and input power per unit volume of the continuous phase as scale-up criteria, it is found that the scale-up effect of the SVMG is the smallest only when the input power per unit volume is the same and the energy consumption of the size scale-up is higher than that of the quantitative scaleup. An empirical correlation between d 32 and the input power per unit volume is established. Finally, the energy efficiency of the SVMG is evaluated with k L a/(P/V) as an index, and the optimal energy efficiency is 0.80 m 3 /(kW•s), which is equivalent to or even better than that in the gas−liquid system.

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