Regimes of Spreading of a Water Droplet Over Substrates with Varying Wettability

Abstract. Change of the static contact angle (SCA) of 10 μL distilled water droplet on laser textured aluminium alloy (AMG-6) substrates was studied. The texture was deposited by a laser system based on a fiber laser. An increase in the power of laser radiation is found to lead to a decrease in the SCA measured on the first day after texturing. Change of dispersion and polar surface energy components of textured substrates is determined. Under the influence of the environment, the surface properties of AMG-6 change with time. SCA increased and reached stable state on the twentieth day after texturing.

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“…The setup includes an optical shadow system. A detailed description of the operational principles is given in [14][15].…”

Section: Methodsmentioning

confidence: 99%

Modification of aluminum alloy surface properties by wave-long laser texturing

et al. 2017

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“…The scheme of the experimental setup is presented in Fig. 1 [11][12][13]. To implement the optical shadow method, the light source 1, ground glass 2, shield with an opening 3, and the collimating lens 4 were used to produce a beam of plane-parallel light illuminating a drop on the substrate 5.…”

Section: Experimental Techniquementioning

confidence: 99%

“…The spreading of a drop on a surface is known to depend on surface microstructure and properties of the liquid [10][11][12][13][14][15][16]. There is a lack in the experimental research studying the effect of the drop growth rate on the spreading.…”

Section: Introductionmentioning

confidence: 99%

Forced wetting of stainless steel by distilled water drop

et al. 2017

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Abstract.Experimental results analyses of macroscopic contact angle change from the drop growth rate of distilled water on stainless steel substrates is presented. The value of contact angle is found to depend on the drop growth rate (m): contact angle decreases at m up to 0.02ml/s and increases at m more than 0.02ml/s. At the final stage of spreading the contact line pinning occurs, depending on the drop growth rate and surface roughness.

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“…It happens due to the lack of available registration equipment of fast processes of wetting and spreading. In the last decade scientific and technological progress in the field of microelectronics has allowed to create a relatively inexpensive photo and video devices allowing by research groups [13][14][15][16][17][18][19] to record the physical mechanisms of fast processes. It should be noted that changes in the dynamic contact angle (DCA) during wetting surfaces (including super hydrophilic) by advancing and receding drops were studied only at slow movement of the three-phase contact line (up to 1 mm/sec).…”

Section: Introductionmentioning

confidence: 99%

Forced spreading over superhydrophobic and copper surfaces

2017

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Abstract. Dynamic spreading over superhydrophobic and copper surfaces was studied experimentally under the condition of contact line movement with speed greater than 1 mm/sec. Three modes of spreading of distilled water drop over copper surfaces with sufficient typical roughness (0.591, 5.190 and 6.210 µм) were detected. The first one is drop formation when the contact line speed and dynamic contact angle increase sharply. The second mode is spreading of a drop, which is characterized by a monotonic decrease in the contact line speed and dynamic contact angle. The third one is a formation of an equilibrium contact angle at a constant wetted area (the contact line speed tends to zero, and spreading of a drop occurs as long as the driving force is greater than zero). Some features in spreading were detected on superhydrophobic surface with parameter roughness of 0.751µm compared to other substrates. During drop formation after sharp increase in the contact line speed and dynamic contact angle, there is a mode which is accompanied by a decrease in the contact line speed and monotonic increase in the advancing dynamic contact angle.

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Regimes of Spreading of a Water Droplet Over Substrates with Varying Wettability

Cited by 41 publications

References 20 publications

Modification of aluminum alloy surface properties by wave-long laser texturing

Modification of aluminum alloy surface properties by wave-long laser texturing

Forced wetting of stainless steel by distilled water drop

Forced spreading over superhydrophobic and copper surfaces

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