Lubricant Droplets Can Bounce on Wetted Cylinders
Authors:
C Yuea, Q Daia, J Wanga, W Huanga, X Wanga
Publisher:
Journal of Materials and Engineering
Abstract:
In this work, the droplet bounce phenomenon of polyalphaolefin, olive
oil, silicone oil, and paraffin oil on wetted cylinders was reported. With
a uniform oil film with a thickness of 0.06 mm formed on the cylinder,
typical categories of spread, maximum, retract, deposit, and bounce
existed. The ratio of the maximum spreading diameter and the initial
diameter was negatively corrected with the viscosity due to the viscous
resistance. The effect of tangential velocity from 0 m/s to 0.75 m/s on
the spreading was investigated, which shows a strong promotion for it.
The force analysis explained the mechanism of bouncing caused by the
compressed air film, and oil droplets would bounce if the support force
was larger than the combined force of gravity and inertia force. The
findings in the work provide a basic understanding of droplets impact
on wetted and rotating surfaces and design concepts for applications
in modern industry.
