Deegan group



New manuscript on the crown splash

X-ray imaging work on drop impact highlight

New paper on seed dispersal

Our paper highlighted in focus on fluids

New paper on ejecta dynamics

New paper on crown splash

Strip waves featured in PRE Kaleidoscope

New paper on strip waves

Capillary workshop at Lorentz institute

New paper on persistent holes

NPR science friday feature

Blurb in Nature


Simple systems driven from equilibrium will spontaneously form patterns.  A classic demonstration is a pot of water on a stove.  If the stove is not turned on, the water remains still.  The fluid is in equilibrium, and all parts behave the same; there is no structure.  But if the heat is turned on, the water begins to move in an organized manner.  The water rises along the walls of the pot and falls in the middle.  From initially homogeneous conditions the water has developed an organized dynamical structure.  The world is filled with countless examples of this general phenomenon from the mundane—the ornate architecture of a snow flake, the crown-like splash of a drop, the dark ring around a coffee strain—to the exotic— the Earth’s magnetic field, sunspots, the large scale structure of the universe.

Is all the structure in world around us an inevitable product of the forcing?  Is life itself a generic manifestation of driven systems?  These are fascinating issues that research on nonequilibrium systems and pattern formation will hopefully one day answer.

My research focus is patterns in fluids and solids. Lately, I've been working on drop impact, patterns in chemical systems, and electrowetting on semicondcutors. Some past projects include vibrated shear thickening fluids, vibrated drops, the statistics of caustic networks, exploding seed pods, the fracture of rubber and silicon, and the formation of rings from a drying drop.

Updated November 7, 2014