Fluid Mechanics


Drops on cylindrical wires

Static and dynamic contact angle measurements for liquid lying on plane surfaces and wires are important for describing the adhesion properties of the surfaces. For example, these measurements can give information about the modifications induced to the surface characteristics of polymers, in film or fiber forms, after a dielectric barrier discharge treatment at atmospheric pressure. Giving the sensitivity of these quantities to small variations of the measured contact angles, the interest is to establish reliable and simple methods which would improve the accuracy of the measurements.

We perform both experiments and numerical simulations with drops situated on cylindrical substrates. The aim of our study is to find efficient methods to extract (static and dynamic) contact angle values from the experimental and numerical results. We also wish to see how changes the drops shape on a cylindrical surface? What happens when the wire is accelerated in axial direction or when the wire oscillates?