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Investigations of bubble size distribution on swirl effervescent atomizer flotation
Liansheng Liu,Jun Xie,Xuanchen Liu,Huiru Qu,Fang Zhao,Runze Duan 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
Atomizer flotation has the advantages of low cost, low energy consumption, adjustable, and long cycle lifein industrial applications. The bubble diameter is an important parameter for floatation. The smaller thebubble diameter, the better the flotation effect. However, the bubble diameter produced by the atomizerduring flotation separation is large at present. In this paper, a swirl effervescent atomizer is designed andexperimental diagnosis through a spray measurement system and submerged spray visualization system. The diameter and size distribution of bubbles in 5 mm from the atomizer outlet to the jet cross-sectionspray were discussed. The results showed that the swirl effervescent atomizer obtained a fine Sautermean diameter (SMD is 13–25 lm) compared with the traditional atomizer. Three flow patterns wereobserved at the submerged spray system: large bubbly flow, discrete bubbly flow, and slug flow. A statisticalmethod of bubbles under high injection pressure was proposed. The effects of the operating conditionsof the effervescent atomizer on the bubble diameter were investigated. The average bubblediameter decreased with the increase in injection pressure and gas–liquid mass flow ratios (GLR). However, with the GLR being increased to 0.15, the influence of injection pressure on bubble diameterwas reduced. The backpressures (Liquid level heights) have less effect on bubbles compared with injectionpressure and GLR. This paper has great significance for the sustainable development of the atomizerin the flotation separation application.