2010-11 TinyDrops
Size Dependence of Drops Impacting Superhydrophobic Surfaces, by D.A. Bolleddula, H.E. Dillon, A. Aliseda, P.S. Bhosale, J.C. Berg Mechanical and Chemical Engineering, University of Washington
Read More![The implementation of multiscale roughness has demonstrated a variety of interesting outcomes when a liquid droplet impacts such a surface. It has been shown [1] that when water drops of size D ∼2 mm impact superhydrophobic surfaces they can recede, rebound (top), jet, and even splash (bottom). Here we investigate the effect of drop size on surfaces of increasing roughness over We ∼1-5. As we expect, drops of size D ∼2 mm will bounce for We ∼ O(1 − 10), but what happens if we decrease the drop size while holding the Weber number (We) constant?<br />
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[1] P. Tsai, S. Pacheco, C. Pirat, L. Lefferts, and D. Lohse. Drop impact upon micro- and nanostructured superhydrophobic surfaces. Langmuir, 25:12293–12298, 2009](https://photos.smugmug.com/Math/2010-11-TinyDrops/i-sPBncSf/0/18d845d5/M/Collages5-M.jpg)
The implementation of multiscale roughness has demonstrated a variety of interesting outcomes when a liquid droplet impacts such a surface. It has been shown [1] that when water drops of size D ∼2 mm impact superhydrophobic surfaces they can recede, rebound (top), jet, and even splash (bottom). Here we investigate the effect of drop size on surfaces of increasing roughness over We ∼1-5. As we expect, drops of size D ∼2 mm will bounce for We ∼ O(1 − 10), but what happens if we decrease the drop size while holding the Weber number (We) constant?
[1] P. Tsai, S. Pacheco, C. Pirat, L. Lefferts, and D. Lohse. Drop impact upon micro- and nanostructured superhydrophobic surfaces. Langmuir, 25:12293–12298, 2009
![The implementation of multiscale roughness has demonstrated a variety of interesting outcomes when a liquid droplet impacts such a surface. It has been shown [1] that when water drops of size D ∼2 mm impact superhydrophobic surfaces they can recede, rebound (top), jet, and even splash (bottom). Here we investigate the effect of drop size on surfaces of increasing roughness over We ∼1-5. As we expect, drops of size D ∼2 mm will bounce for We ∼ O(1 − 10), but what happens if we decrease the drop size while holding the Weber number (We) constant?<br />
<br />
[1] P. Tsai, S. Pacheco, C. Pirat, L. Lefferts, and D. Lohse. Drop impact upon micro- and nanostructured superhydrophobic surfaces. Langmuir, 25:12293–12298, 2009](https://photos.smugmug.com/Math/2010-11-TinyDrops/i-sPBncSf/0/18d845d5/Ti/Collages5-Ti.jpg)
