Dynamic Contact Angle Measurements

Numerical modelling of the dynamic contact angle

Simulation of Droplet Impact with Dynamic Contact Angle Boundary Conditions

The numerical simulation of dynamic wetting processes is of interest for a vast variety of industrial processes, where practical experiments are costly and timeconsuming. In these simulations, the dynamic contact angle is a key parameter, but the modeling of its behavior is poorly understood so far. In this article, we simulate droplet impact on a dry flat surface by using two different contact...

Simulations of impinging droplets with surfactant-dependent dynamic contact angle

Article history: Received 6 October 2014 Received in revised form 4 August 2015 Accepted 17 August 2015 Available online 24 August 2015

Dynamic Contact Angle on a Surface with Gradient in Wettability

The retention and drainage of water on heat exchangers is extremely important in air-conditioning, refrigeration, and heat-pumping systems. In this work, droplets of varying sizes sliding on an inclined heat exchanger materials with and without a wettability gradient are observed using a high-speed camera. The dynamic contact angles, the shape evolution and the velocity of the droplet are obtai...

Effect of temperature on the dynamic contact angle

The temperature influence on the contact angle relaxation of partially wetting drops is measured for squalane on poly(ethyleneterephthalate). The results are analyzed with the molecular kinetic model, a hydrodynamic model and a model that combines the two previous ones. For each temperature all three approaches can fit our experiments well, but only the molecular kinetic approach leads to physi...