Can a dynamic contact angle be understood in terms of a friction coefficient?

被引:113
作者
Hamraoui, A
Thuresson, K
Nylander, T
Yaminsky, V
机构
[1] Lund Univ, Ctr Chem & Chem Engn, SE-22100 Lund, Sweden
[2] Australian Natl Univ, Inst Adv Studies, Res Sch Phys Sci & Engn, Dept Appl Math, Canberra, ACT 0200, Australia
关键词
capillary rise; wetting; friction; dynamic contact angle;
D O I
10.1006/jcis.2000.6830
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The kinetics of capillary rise of pure water and ethanol as well as mixtures thereof that under static conditions wet glass capillaries has been studied by a high-speed imaging technique. To adequately describe the experimental data, a rate-dependent dynamic contact angle must be added to the Washburn-Lucas equation. This result is discussed in terms of a molecular friction coefficient at the front of the liquid flowing over the substrate. Dynamic inertia effects are significant at the initial stages of spreading and may have further importance for capillaries of larger radii. In addition, it was found that the preparation and cleaning of glass capillaries, which are essential for the liquid substrate interaction, have a significant effect on the initial rate of rise of the liquid. (C) 2000 Academic Press.
引用
收藏
页码:199 / 204
页数:6
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