Wetting and spreading of droplets on rough aluminum surfaces

Anastasia Islamova,Konstantin Ponomarev,D.M Markovich,P.A Kuibin,M.A Vorobyev

doi:10.1051/epjconf/201919600024

Anastasia Islamova, Konstantin Ponomarev + Show 3 more

Open Access

https://doi.org/10.1051/epjconf/201919600024

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Abstract

The wetting and spreading of distilled water droplets on abrasion-treated aluminum alloy AlMg 6 surfaces were studied. Using the shadow method, the dependences of the dynamic contact angle and hysteresis on the arithmetic mean of the profile deviation were obtained. Based on the analysis of the height and hybrid 3D roughness parameters, a relationship between the texture and spreading of the droplet is established.

Highlights

Wetting and spreading is central to many natural phenomena and industrial operations such as coating, spray cooling, lubrication etc. [1,2,3,4]
The lastmentioned characterize only chosen profile and do not allow to evaluate the change in the relief along the surface in two coordinate directions. Another phenomenon influenced by the surface roughness is the contact angle hysteresis (CAH) [13], which is the difference between the advancing and receding dynamic contact angles (DCA)
The CAH is possible to use for estimating the state of a solid surface

Summary

Introduction

Wetting and spreading is central to many natural phenomena and industrial operations such as coating, spray cooling, lubrication etc. [1,2,3,4]. One of the most important scientific direction is to study wetting of engineering metal surfaces used in different industrial applications and liquid spreading over them. The lastmentioned characterize only chosen profile and do not allow to evaluate the change in the relief along the surface in two coordinate directions. Another phenomenon influenced by the surface roughness is the contact angle hysteresis (CAH) [13], which is the difference between the advancing and receding dynamic contact angles (DCA). It is important to study spreading of a liquid droplet over rough surfaces taking into account the value of the CAH, which can vary depending on the roughness and irregularity locations

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