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http://dx.doi.org/10.7735/ksmte.2013.22.1.15

Measurements of Flow Meniscus Movement in a Micro Capillary Tube  

Lee, Sukjong (서울과학기술대학교 에너지환경대학원)
Sung, Jaeyong (서울과학기술대학교 기계자동차공학과)
Lee, Myeong Ho (서울과학기술대학교 기계자동차공학과)
Publication Information
Journal of the Korean Society of Manufacturing Technology Engineers / v.22, no.1, 2013 , pp. 15-21 More about this Journal
Abstract
In this paper, a high-speed imaging and an image processing technique have been applied to detect the position of a meniscus as a function of time in the micro capillary flows. Two fluids with low and high viscosities, ethylene glycol and glycerin, were dropped into the entrance well of a circular capillary tube. The filling times of the meniscus in both cases of ethylene glycol and glycerin were compared with the theoretical models - Washburn model and its modified model based on Newman's dynamic contact angle equation. To evaluate the model coefficients of Newman's dynamic contact angle, time-varying contact angles under the capillary flows were measured using an image processing technique. By considering the dynamic contact angle, the estimated filling time from the modified Washburn model agrees well with the experimental data. Especially, for the lower-viscosity fluid, the consideration of dynamic contact angle is more significant than for the higher-viscosity fluid.
Keywords
Capillary meniscus; Dynamic contact angle; Filling time; Surface tension; Underfill process;
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