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Experimental study on the spreading dynamics behavior of oil droplets over hydrophilic surfaces in air and water phases

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Abstract

The spreading behavior of droplets on solid surfaces in air has been widely investigated; however, relatively few studies are conducted on the spreading of oil droplets over solid surfaces in aqueous environments, and furthermore, the differences in the oil droplet spreading behavior in the two media environments have not been specifically reported. In this work, the spreading dynamics behavior of a millimeter-sized oleic acid droplet (referred to as oil droplet) on a highly hydrophilic substrate (glass slide) in air and deionized water environments was studied in terms of dynamic contact angle by using a high-speed imaging technology, and their spreading behavior differences were revealed. Results showed that the spreading of an oil droplet on the glass slide in air could be divided into three stages: the early linear rapid spreading stage dominated by inertial force, the intermediate exponential slow spreading stage dominated by viscous forces and the long-term spreading stage tending to the quasi-equilibrium state. In contrast, the spreading process of oil droplets on glass slides in deionized water consisted of two sub-processes: the initial linear slow spreading process and the long-term spreading process tending to the equilibrium state. It is clear that the spreading behavior of oil droplets on glass slides in air and deionized water was different, and their differences were mainly due to the presence of the hydration layer on the glass slide surface and the action of the fluid around the oil droplet in deionized water. These findings can provide guidance for the recovery of crude oil in geological reservoirs and help to understand the spreading mechanism of oil droplets on solid surfaces.

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Acknowledgements

This work was supported by the National Nature Science Foundation of China (U1704252) and Key R & D and popularized project in Henan Province (212102310009) for which the authors express their appreciation.

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Correspondence to Yijun Cao or Guosheng Li.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Wang, J., Cao, Y. & Li, G. Experimental study on the spreading dynamics behavior of oil droplets over hydrophilic surfaces in air and water phases. Exp Fluids 63, 50 (2022). https://doi.org/10.1007/s00348-022-03400-1

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  • DOI: https://doi.org/10.1007/s00348-022-03400-1

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