Dynamic characteristics of water spreading over laser-textured aluminum alloy surfaces | Научно-инновационный портал СФУ

Dynamic characteristics of water spreading over laser-textured aluminum alloy surfaces

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.1016/j.colsurfa.2020.125253

Ключевые слова: aluminum alloy, contact angle hysteresis, fluctuations, spreading, three-phase contact line, wetting

Аннотация: Laser texturing has great potential for controlling wetting properties as well as spreading dynamics of liquid small volumes on technological metal surfaces. In this work, nanosecond pulse laser was used to create some ordered and anisotropic textures on aluminum alloy surfaces. The dynamic characteristics and contact angle hysteresis were obtained by increasing and decreasing the droplet volume. In this wetting/dewetting cycle, we recorded fluctuational movements of the three-phase contact line over the surfaces with an ordered texture when the capillary number tends to zero. These movements are caused by activity of forces leading to fluid circulation in the droplet, as well as inertia and gravity. To determine the contact angle hysteresis when the three-phase contact line fluctuates, we developed a new approach. We showed that the contact angle hysteresis depends on the droplet state (the presence of air cushions in the cavities in a thin near-surface layer) largely than on the roughness. We found the influence of repeated wetting cycles (multiple advancing and receding liquid movement) on the dynamic characteristics of water spreading over the laser-textured aluminum alloy surfaces. The molecular-kinetic and hydrodynamic models were used to interpret the liquid movement over the surfaces with ordered and anisotropic textures. © 2020 Elsevier B.V.

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Издание

Журнал: Colloids and Surfaces A: Physicochemical and Engineering Aspects

Выпуск журнала: Vol. 603

ISSN журнала: 09277757

Издатель: Elsevier B.V.125253

Авторы

  • Kuznetsov G.V (Natl Res Tomsk Polytech Univ, Lenin Ave 30, Tomsk 634050, Russia)
  • Feoktistov D.V (Natl Res Tomsk Polytech Univ, Lenin Ave 30, Tomsk 634050, Russia)
  • Orlova E.G. (Natl Res Tomsk Polytech Univ, Lenin Ave 30, Tomsk 634050, Russia)
  • Zykov I.Y. (Natl Res Tomsk Polytech Univ, Lenin Ave 30, Tomsk 634050, Russia)
  • Bartuli E. (Brno Univ Technol, Fac Mech Engn, Heat Transfer & Fluid Flow Lab, Technicka 2896-2, Brno 61669, Czech Republic)
  • Raudensky M. (Brno Univ Technol, Fac Mech Engn, Heat Transfer & Fluid Flow Lab, Technicka 2896-2, Brno 61669, Czech Republic)
  • Zhuikov A.V (Siberian Fed Univ, Svobodny Ave 79, Krasnoyarsk 660041, Russia)

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