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Lubricants
Volume 11
Issue 1
10.3390/lubricants11010031
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Article

Spreading Behavior of Single Oil Droplet Impacting Surface with/without a Thin Liquid Film

by
He Liang
1,
Peiyi Yang
1,
Wenzhong Wang
1,*,
Yanfei Liu
1,
Xiangyu Ge
1 and
Baohong Tong
2
1
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
2
School of Mechanical Engineering, Anhui University of Technology, Ma’anshan 243032, China
*
Author to whom correspondence should be addressed.
Lubricants 2023, 11(1), 31; https://doi.org/10.3390/lubricants11010031
Submission received: 14 December 2022 / Revised: 6 January 2023 / Accepted: 8 January 2023 / Published: 12 January 2023
(This article belongs to the Special Issue Friction and Wear of Coatings/Films)
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Abstract

When oil droplets impact a solid surface for oil-air lubrication, they may spread out to produce a thin oil layer on the surface, which serves as a significant source of lubrication. A test rig was constructed in this research to observe the spreading behavior of oil droplets impacting surfaces from both frontal and lateral views. From the frontal view, laser-induced fluorescence techniques are used to measure the thickness of the oil layer quantitatively during the spreading of oil droplets. While the lateral view can observe the shape evolution of the droplets. Oil droplet spreading patterns on the sheet with dry surfaces and with different thin liquid film thicknesses were studied, and the effect of viscosity and the thickness of the thin liquid film on spreading radius and spreading thickness is considered. The experimental findings demonstrate that the maximum spreading factor, the spreading central layer thickness, and the apparentness of retraction all increase as viscosity increases. The retraction is obviously impacted by thin liquid films, and the retraction weakens as the thin liquid film thickness increases.
Keywords: oil droplets; impact; liquid film; laser-induced fluorescence; film thickness oil droplets; impact; liquid film; laser-induced fluorescence; film thickness

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MDPI and ACS Style

Liang, H.; Yang, P.; Wang, W.; Liu, Y.; Ge, X.; Tong, B. Spreading Behavior of Single Oil Droplet Impacting Surface with/without a Thin Liquid Film. Lubricants 2023, 11, 31. https://doi.org/10.3390/lubricants11010031

AMA Style

Liang H, Yang P, Wang W, Liu Y, Ge X, Tong B. Spreading Behavior of Single Oil Droplet Impacting Surface with/without a Thin Liquid Film. Lubricants. 2023; 11(1):31. https://doi.org/10.3390/lubricants11010031

Chicago/Turabian Style

Liang, He, Peiyi Yang, Wenzhong Wang, Yanfei Liu, Xiangyu Ge, and Baohong Tong. 2023. "Spreading Behavior of Single Oil Droplet Impacting Surface with/without a Thin Liquid Film" Lubricants 11, no. 1: 31. https://doi.org/10.3390/lubricants11010031

APA Style

Liang, H., Yang, P., Wang, W., Liu, Y., Ge, X., & Tong, B. (2023). Spreading Behavior of Single Oil Droplet Impacting Surface with/without a Thin Liquid Film. Lubricants, 11(1), 31. https://doi.org/10.3390/lubricants11010031

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