Hydrodynamics of Writing with Ink

Title
Hydrodynamics of Writing with Ink
Authors
김정철문명운이광렬L. Mahadevan김호영
Keywords
Ink Writing; Hydrophilic; DLC
Issue Date
2011-12
Publisher
Physical review letters
Citation
VOL 107, NO 26, 264501-1-264501-4
Abstract
Writing with ink involves the supply of liquid from a pen onto a porous hydrophilic solid surface, paper. The resulting linewidth depends on the pen speed and the physicochemical properties of the ink and paper. Here we quantify the dynamics of this process using a combination of experiment and theory. Our experiments are carried out using a minimal pen, a long narrow tube that serves as a reservoir of liquid, which can write on a model of paper, a hydrophilic micropillar array. A minimal theory for the rate of wicking or spreading of the liquid is given by balancing the capillary force that drives the liquid flow and the resistance associated with flow through the porous substrate. This allows us to predict the shape of the front and the width of the line laid out by the pen, with results that are corroborated by our experiments.
URI
http://pubs.kist.re.kr/handle/201004/41917
ISSN
00319007
Appears in Collections:
KIST Publication > Article
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