Abstract
Direct simulations on the dynamics of a liquid film coating on the outer surface of a vertical fiber are performed in the present paper. A domain mapping technique has been used on solving the Navier-Stokes problem in stream function form and predicts the dynamics of the various flow regimes with remarkable accuracy. We investigated the morphologies that develop in the coating flow down fiber and analyze the effects of Bond number and fiber diameter on the maximum liquid film height and drop speed. The results showed that the Bond number and fiber diameter have a significant effect on the instability. The transition between the Plateau-Rayleigh and convective regimes occurs at the conditions when the flow transitions from absolutely to convectively unstable.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
This work was supported by Natural Science Foundation of China (Grant No. 51766002), and Natural Science Foundation of Guangxi (Grants No. 2022GXNSFAA035616). This research was also supported by(Grants No. 2006540007Z), and Engineering Research Center of Electronic Information Materials and Devices (Grant No. EIMD-AB202008).
Funding
Natural Science Foundation of China (Grant No. 51766002), and Natural Science Foundation of Guangxi Province (Grants No. 2022GXNSFAA035616).
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Xiaoyong Chen wrote the main manuscript text; Rong Liu conceived the idea of the study; Dejian Zhou and Yulai She contributed to refining the ideas, carrying out additional analyses and finalizing this paper. All authors reviewed the manuscript.
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Chen, X., Liu, R., Zhou, D. et al. Direct Simulation on the Dynamics of Liquid Films Flowing Down a Fiber. Microgravity Sci. Technol. 35, 14 (2023). https://doi.org/10.1007/s12217-023-10032-5
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DOI: https://doi.org/10.1007/s12217-023-10032-5