کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
611704 | 880682 | 2008 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Contact line mobility in liquid droplet spreading on rough surface Contact line mobility in liquid droplet spreading on rough surface](/preview/png/611704.png)
We quantitatively estimate the effect of the substrate roughness on the liquid droplet spreading. Since the droplet size is in the order of millimeters, the surface energy becomes the dominant factor. A nonequilibrium thermodynamics framework [Y.X. Gao, H. Fan, Z. Xiao, Acta Mater. 48 (2000) 863–874] seems feasible for describing the millimeter size droplet spreading on a solid substrate. Within the framework, there are two system constants, namely the mobilities of liquid/air surface and the triple joint contact line that need to be determined from experimental testing. In the present paper, we demonstrate the experimental process of determining the mobility of the contact line via a droplet spreading on a steel substrate. Particularly, we obtained the contact line mobility on a steel surface with various roughness values. It is shown that the mobility value is lower for a rougher surface.
The experimental data of Plate 1 with roughness of Ra=0.128 μmRa=0.128 μm are fitted into a dimensionless numerical curve. The contact line mobility is calculated as ML=R∗t0γLV.Figure optionsDownload as PowerPoint slide
Journal: Journal of Colloid and Interface Science - Volume 323, Issue 1, 1 July 2008, Pages 126–132