Asymmetric Drop Movement
Definition of Contact Angles
On a tilted texture, the contact angle between liquid and solid depends (1) on the direction of liquid movement and (2) on the stroke direction (here from right to left). The asymmetry of the texture results in four angles and a preferential direction of liquid movement (here from right to left).
Preferential drop movement
This work was supported by the Swedish Ångpanneföreningens Forskningsstiftelse and performed under the supervision of Lars Westerberg at the Ångström Laboratory in Uppsala, Sweden.