Download
droplet impact on solid surfaces n.
Skip this Video
Loading SlideShow in 5 Seconds..
Droplet Impact on Solid Surfaces PowerPoint Presentation
Download Presentation
Droplet Impact on Solid Surfaces

Droplet Impact on Solid Surfaces

112 Vues Download Presentation
Télécharger la présentation

Droplet Impact on Solid Surfaces

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Droplet Impact on Solid Surfaces Investigator: C. M. Megaridis, Mechanical and Industrial Engineering Primary Grant Support: Motorola, NASA • Droplet impact ubiquitous in nature and relevant to many practical technologies (coatings, adhesives, etc.) • Spreading/recoiling of droplets impacting on solid surfaces (ranging from wettable to non-wettable) features rich inertial, viscous and capillary phenomena • Objective is to provide insight into the dynamic behavior of the apparent contact angle  and its dependence on contact-line velocity VCL at various degrees of surface wetting • Perform high-speed imaging of droplet impacts under a variety of conditions • By correlating the temporal behaviors of contact angle  and contact-line speed VCL, the  vs. VCL relationship is established • Common wetting theories are implemented to extract values of microscopic wetting parameters (such as slip length) required to match the experimental data • Surface wettability has a critical influence on dynamic contact angle behavior • There is no universal expression to relate contact angle with contact-line speed • Spreading on non-wettable surfaces indicates that only partial liquid/solid contact is maintained • The present results offer guidance for numerical or analytical studies, which require the implementation of boundary conditions at the moving contact line