Breath Figures under Electrowetting: Electrically Controlled Evolution of Drop Condensation Patterns

Davood Baratian, Ranabir Dey, Harmen Hoek, Dirk van den Ende, Frieder Mugele (Corresponding Author)

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Abstract

We show that electrowetting (EW) with structured electrodes significantly modifies the distribution of drops condensing onto flat hydrophobic surfaces by aligning the drops and by enhancing coalescence. Numerical calculations demonstrate that drop alignment and coalescence are governed by the drop-size-dependent electrostatic energy landscape that is imposed by the electrode pattern and the applied voltage. Such EW-controlled migration and coalescence of condensate drops significantly alter the statistical characteristics of the ensemble of droplets. The evolution of the drop size distribution displays self-similar characteristics that significantly deviate from classical breath figures on homogeneous surfaces once the electrically induced coalescence cascades set in beyond a certain critical drop size. The resulting reduced surface coverage, coupled with earlier drop shedding under EW, enhances the net heat transfer.

Original languageEnglish
Article number214502
Number of pages5
JournalPhysical review letters
Volume120
Issue number21
DOIs
Publication statusPublished - 24 May 2018

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condensation
drop size
coalescing
electrodes
condensing
condensates
flat surfaces
cascades
heat transfer
alignment
electrostatics
electric potential
energy

Cite this

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Breath Figures under Electrowetting : Electrically Controlled Evolution of Drop Condensation Patterns. / Baratian, Davood; Dey, Ranabir; Hoek, Harmen; van den Ende, Dirk; Mugele, Frieder (Corresponding Author).

In: Physical review letters, Vol. 120, No. 21, 214502, 24.05.2018.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Breath Figures under Electrowetting

T2 - Electrically Controlled Evolution of Drop Condensation Patterns

AU - Baratian, Davood

AU - Dey, Ranabir

AU - Hoek, Harmen

AU - van den Ende, Dirk

AU - Mugele, Frieder

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