Abstract
When a droplet impinges on a solid surface, its kinetic energy is mainly converted to capillary energy and viscous dissipation energy, the ratio of which depends on the wettability of the target surface and the liquid properties. Currently, there is no experimental or theoretical evidence that suggests which types of liquids exhibit the capillary energy-dominated impingement behavior. In this paper, we reported the droplet impingement behavior for a wide range of liquid viscosities, surface tensions and target surface wettabilities. Then, we showed that a recently developed energy balance equation for the droplet impingement behavior can be universally employed for predicting the maximum spreading contact area diameter of a droplet for Newtonian liquids in deposition process by modelling the droplet surface deformation. Subsequently, applicability limitations of recent existing models are discussed. The newly developed model demonstrated that the capillary energy-dominated impingement behavior can be observed at considerably low viscosities of liquid droplets such as that of the superfluid of liquid helium.
Highlights
Impingement of droplets on solid surfaces is a key physical factor in combustion, coating processes, inkjet printing, and spray cooling [1,2]
We report the behavior of droplet impingement covering a wide range of liquid viscosities, surface tensions, and target surface wettabilities for superhydrophilic (SHPi), silicone rubber (SR), polycarbonate (PC), and superhydrophobic (SHPo) substrates, including the existing experimental data for a superamphiphobic substrate
We have investigated the deposition behavior of droplet after impingement covering a wide range of liquid viscosities, surface tensions, and target surface wettabilities for superhydrophilic range of liquid viscosities, surface tensions, and target surface wettabilities for superhydrophilic
Summary
Impingement of droplets on solid surfaces is a key physical factor in combustion, coating processes, inkjet printing, and spray cooling [1,2]. Recent studies have reported the effect and importance of the vertical component of the surface tension (σlg sinθ) on the wetting phenomena [25,26,27,28,29]. This factor has long been neglected because of the resistance of the solid surface [30]. We report the behavior of droplet impingement covering a wide range of liquid viscosities, surface tensions, and target surface wettabilities for superhydrophilic (SHPi), silicone rubber (SR), polycarbonate (PC), and superhydrophobic (SHPo) substrates, including the existing experimental data for a superamphiphobic substrate. This modified model demonstrates that the impingement behavior of a superfluid will exhibit the scaling relation of βm ≈ We1/2
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
