Abstract
We study the evaporation dynamics of multiple water droplets deposited
in ordered arrays or randomly distributed (sprayed) on superhydrophobic
substrates (SHP) and smooth silicone wafers (SW). The evaluation of mass
of the droplets as a function of time shows a power-law behavior with
exponent 3/2, and from the prefactor of the power-law an evaporation
rate can be determined. We find that the evaporation rate on a SHP
surface is slower than a normal surface for both single droplet and
collection of droplets. By dividing a large droplet into more smaller
ones, the evaporation rate increases and the difference between the
evaporation rates on SHP and SW surfaces becomes higher. The evaporation
rates depend also on the distance between the droplets and increase with
increasing this distance.