Collective behavior of evaporating droplets on superhydrophobic surfaces

We study the evaporation dynamics of multiple water droplets deposited in ordered arrays or randomly distributed (sprayed) on superhydrophobic substrates (SHP) and smooth silicon wafers (SW). The evaluation of mass of the droplets as a function of time shows a power‐law behavior with exponent 3/2, a...

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Bibliographic Details
Published in:AIChE journal 2020-08, Vol.66 (8), p.n/a
Main Authors: Moradi Mehr, Shiva, Businaro, Luca, Habibi, Mehdi, Moradi, Ali‐Reza
Format: Article
Language:English
Subjects:
collective behavior
Droplets
Evaporation
Evaporation rate
Hydrophobic surfaces
Hydrophobicity
Silicon substrates
Silicon wafers
superhydrophobic surface
Water drops
water evaporation
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Summary:We study the evaporation dynamics of multiple water droplets deposited in ordered arrays or randomly distributed (sprayed) on superhydrophobic substrates (SHP) and smooth silicon 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 of the droplets which increase with increasing this distance.
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.16284