publication . Article . 2011

Convection-enhanced water evaporation

B. M. Weon; J. H. Je; C. Poulard;
Open Access
  • Published: 01 Mar 2011 Journal: AIP Advances, volume 1, page 12,102 (eissn: 2158-3226, Copyright policy)
  • Publisher: AIP Publishing
Abstract
Water vapor is lighter than air; this can enhance water evaporation by triggering vapor convection but there is little evidence. We directly visualize evaporation of nanoliter (2 to 700 nL) water droplets resting on silicon wafer in calm air using a high-resolution dual X-ray imaging method. Temporal evolutions of contact radius and contact angle reveal that evaporation rate linearly changes with surface area, indicating convective (instead of diffusive) evaporation in nanoliter water droplets. This suggests that convection of water vapor would enhance water evaporation at nanoliter scales, for instance, on microdroplets or inside nanochannels.
Subjects
arXiv: Physics::Atmospheric and Oceanic PhysicsPhysics::Fluid Dynamics
free text keywords: General Physics and Astronomy, Convection, Chemistry, Evaporation rate, Lighter than air, Analytical chemistry, Water vapor, Chemical physics, Drop (liquid), Wafer, Condensed matter physics, Evaporation, Contact angle, Physics, QC1-999
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