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Zhiwei Zhang,Mengyu Fan,Qianqiao Wang,Huaiyu Li,Chunying Zhu,Youguang Ma,Taotao Fu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.110 No.-
This study focuses on the influence of the resultant force caused by the density difference of the twophases on the droplet generation process in a step-emulsification microfluidic device. Threedimensionalvisualization is used to observe the characteristics of droplet generation. According to thedifference in droplet generation form, it can be divided into drip generation mode and suspended generationmode. In the suspended generation mode, the droplets are more inclined to the formation process ofthe expansion of the ellipsoid, whose size in the horizontal direction is larger than the vertical direction;while in the drip generation mode, the shape of the droplet is opposite. The control stage of the dropletgeneration under various operating conditions is determined. As the viscosity of the dispersed phaseincreases, the control stage of the suspended generation mode is the necking stage, and the control stageof the drip generation mode changes from the first stage of three-dimensional expansion to the neckingstage. The model of the droplet generation is proposed by combining mechanical analysis and experimentaltesting data, and the droplet size prediction formula is thereby obtained.