Physics – Fluid Dynamics
Scientific paper
2010-10-15
Physics
Fluid Dynamics
This entry contains a Fluid Dynamics Video candidate for the Gallery of Fluid Motion 2011 and a brief article with information
Scientific paper
The pioneering work of Deegan et al. [Nature 389, (1997)] showed how a drying sessile droplet suspension of particles presents a maximum evaporating flux at its contact line which drags liquid and particles creating the well known coffee stain ring. In this Fluid Dynamics Video, measurements using micro Particle Image Velocimetry and Particle Tracking clearly show an avalanche of particles being dragged in the last moments, for vanishing contact angles and droplet height. This explains the different characteristic packing of the particles in the layers of the ring: the outer one resembles a crystalline array, while the inner one looks more like a jammed granular fluid. Using the basic hydrodynamic model used by Deegan et al. [Phys. Rev. E 62, (2000)] it will be shown how the liquid radial velocity diverges as the droplet life comes to an end, yielding a good comparison with the experimental data.
Gelderblom Hanneke
Lohse Detlef
Marín Álvaro G.
Snoeijer Jacco
No associations
LandOfFree
Avalanche of particles in evaporating coffee drops does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Avalanche of particles in evaporating coffee drops, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Avalanche of particles in evaporating coffee drops will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-204140