Abstract
A simplified experimental device was used to reveal the dispersed phase droplet formation process in the circumferential shear flow of a liquid–liquid cyclone reactor. Fluorescent oil and deionized water were selected as the dispersed phase and continuous phase, respectively. And the highlight of fluorescent oil under ultra-violet was applied to capture the droplet dynamic behavior. It was found that three droplet formation regimes were observed, including dripping regime, dripping-to-jetting transition regime and jetting regime. Besides, the results indicate that the order of droplet formation speed in three regimes is jetting regime, dripping-jetting transition regime and dripping regime. Moreover, two critical inlet flow rate of dispersed phase were used to characterize the transitions between regimes, which both decreased with the increase in inlet flow rate of continuous phase. But the different reduction rates of them indicate that the transition from dripping regime to jetting regime is faster at greater inlet flow rate of continuous phase. In addition, the typical droplet size distributions in three regimes indicate the size uniformity of droplets formed in dripping regime is better than that in jetting regime and dripping-to-jetting transition regime. However, with the comprehensive consideration of size, uniformity and formation speed, jetting regime is preferred.
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Acknowledgements
The authors gratefully acknowledge the support from the National Natural Science Foundation of China (No. 22208194), the Natural Science Foundation of Shandong Province (No. ZR2020QE204) and the Doctoral Research Fund of Shandong Jianzhu University (No. X18068Z).
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Zhang, M., Chen, J., Tang, M. et al. Visualization investigation of dispersed phase droplet formation regimes in a circumferential shear flow composed of immiscible liquid. J Braz. Soc. Mech. Sci. Eng. 45, 62 (2023). https://doi.org/10.1007/s40430-022-03960-7
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DOI: https://doi.org/10.1007/s40430-022-03960-7