Spreading of a distilled water droplet over polished and laser-treated aluminum surfaces

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5 Citations (Scopus)

Abstract

Spreading of a distilled water droplet over polished and laser-treated aluminum surfaces is studied experimentally. We present an attempt to apply the molecular-kinetic theory to the experimental dependences of the dynamic contact angle on the contact line speed. Advancing and receding contact angles at different liquid flow rates are obtained experimentally, and their values are used to calculate the contact angle hysteresis on each substrate. The bottom-up approach is used to form a droplet on the surface when liquid is supplied through an opening in the substrate. This makes it possible to control wetting and dewetting by increasing and decreasing the droplet volume. The main geometrical parameters are obtained using the shadow method by Axisymmetric Drop Shape Analysis-Profile. Experimental data on the dynamic contact angle on a laser-treated surface are found to be a better fit to the theoretical equation in comparison with the results on a smooth polished surface. We have formulated a hypothesis that the theoretical and experimental values of the dynamic contact angle are in good agreement due to the physics of the process (smaller hysteresis on the laser-treated surface).

Original languageEnglish
Pages (from-to)118-127
Number of pages10
JournalEuropean Journal of Mechanics, B/Fluids
Volume68
DOIs
Publication statusPublished - 1 Mar 2018

Fingerprint

Contact Angle
Aluminum
Dynamic Contact
Laser
aluminum
Water
water
lasers
Hysteresis
hysteresis
Substrate
Contact Line
Shape Analysis
Liquid Flow
liquid surfaces
liquid flow
Smooth surface
Wetting
Kinetic Theory
Bottom-up

Keywords

  • Advancing contact angle
  • Bottom-up approach
  • Contact angle hysteresis
  • Laser-treated surface
  • Receding contact angle

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)

Cite this

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title = "Spreading of a distilled water droplet over polished and laser-treated aluminum surfaces",
abstract = "Spreading of a distilled water droplet over polished and laser-treated aluminum surfaces is studied experimentally. We present an attempt to apply the molecular-kinetic theory to the experimental dependences of the dynamic contact angle on the contact line speed. Advancing and receding contact angles at different liquid flow rates are obtained experimentally, and their values are used to calculate the contact angle hysteresis on each substrate. The bottom-up approach is used to form a droplet on the surface when liquid is supplied through an opening in the substrate. This makes it possible to control wetting and dewetting by increasing and decreasing the droplet volume. The main geometrical parameters are obtained using the shadow method by Axisymmetric Drop Shape Analysis-Profile. Experimental data on the dynamic contact angle on a laser-treated surface are found to be a better fit to the theoretical equation in comparison with the results on a smooth polished surface. We have formulated a hypothesis that the theoretical and experimental values of the dynamic contact angle are in good agreement due to the physics of the process (smaller hysteresis on the laser-treated surface).",
keywords = "Advancing contact angle, Bottom-up approach, Contact angle hysteresis, Laser-treated surface, Receding contact angle",
author = "Orlova, {E. G.} and Feoktistov, {D. V.} and Kuznetsov, {G. V.} and Ponomarev, {K. O.}",
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T1 - Spreading of a distilled water droplet over polished and laser-treated aluminum surfaces

AU - Orlova, E. G.

AU - Feoktistov, D. V.

AU - Kuznetsov, G. V.

AU - Ponomarev, K. O.

PY - 2018/3/1

Y1 - 2018/3/1

N2 - Spreading of a distilled water droplet over polished and laser-treated aluminum surfaces is studied experimentally. We present an attempt to apply the molecular-kinetic theory to the experimental dependences of the dynamic contact angle on the contact line speed. Advancing and receding contact angles at different liquid flow rates are obtained experimentally, and their values are used to calculate the contact angle hysteresis on each substrate. The bottom-up approach is used to form a droplet on the surface when liquid is supplied through an opening in the substrate. This makes it possible to control wetting and dewetting by increasing and decreasing the droplet volume. The main geometrical parameters are obtained using the shadow method by Axisymmetric Drop Shape Analysis-Profile. Experimental data on the dynamic contact angle on a laser-treated surface are found to be a better fit to the theoretical equation in comparison with the results on a smooth polished surface. We have formulated a hypothesis that the theoretical and experimental values of the dynamic contact angle are in good agreement due to the physics of the process (smaller hysteresis on the laser-treated surface).

AB - Spreading of a distilled water droplet over polished and laser-treated aluminum surfaces is studied experimentally. We present an attempt to apply the molecular-kinetic theory to the experimental dependences of the dynamic contact angle on the contact line speed. Advancing and receding contact angles at different liquid flow rates are obtained experimentally, and their values are used to calculate the contact angle hysteresis on each substrate. The bottom-up approach is used to form a droplet on the surface when liquid is supplied through an opening in the substrate. This makes it possible to control wetting and dewetting by increasing and decreasing the droplet volume. The main geometrical parameters are obtained using the shadow method by Axisymmetric Drop Shape Analysis-Profile. Experimental data on the dynamic contact angle on a laser-treated surface are found to be a better fit to the theoretical equation in comparison with the results on a smooth polished surface. We have formulated a hypothesis that the theoretical and experimental values of the dynamic contact angle are in good agreement due to the physics of the process (smaller hysteresis on the laser-treated surface).

KW - Advancing contact angle

KW - Bottom-up approach

KW - Contact angle hysteresis

KW - Laser-treated surface

KW - Receding contact angle

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