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Contact angle and droplet evaporation on the smooth and structured wall surface in a wide range of droplet diameters.pdf
Applied Thermal Engineering 113 (2017) 472–480
Contents lists available at ScienceDirect
Applied Thermal Engineering
journal homepage: /locate/apthermeng
Research Paper
Contact angle and droplet evaporation on the smooth and structured wall surface in a wide range of droplet diameters
S.Y. Misyura
Institute of Thermophysics Siberian Branch, Russian Academy of Sciences, Lavrentiev Ave. 1, Novosibirsk 630090, Russia
highlights
Structured wall relief in?uences droplet wettability. Marangoni force and contact angle depend on the droplet diameter. Droplet evaporation on the structured surface differs from one on a smooth wall. Dependencies for the form of small and large droplets are different.
article info
Article history: Received 23 June 2016 Revised 8 November 2016 Accepted 8 November 2016 Available online 9 November 2016
Keywords: Droplets evaporation Sessile droplet Film boiling Contact angle Structured surface
abstract
Droplet evaporation in a wide range of initial volumes of 1–1000 ll on the structured and smooth sur-
faces was studied experimentally. It is found that the static contact angle on the structured surface for
the steady equilibrium depends on the droplet shape and initial diameter; it has an extreme. With the
increasing wetting diameter of water samples from 2 to 30 mm, the contact angle increases ?rst, reaches
a maximum, then decreases and tends to a constant value. To determine the contact angle, the authors
have performed the comparisons by different methods in a wide range of droplet sizes. A wide range
of droplet sizes is usual for spray cooling. Approximation dependences for determining droplet volume
were obtained in a wide range of droplet sizes. For the droplets with the initial diameter less than
1 mm, middle and large droplets, as well as for the small initial contact angles and angles of about
85–90°, different kinetics of evaporation will be observed. Kinetics of droplet evaporation on the struc-
tured surface differs from evapor
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