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Closed‐end capillary rise—An experimental study
Author(s) -
Wu Pingkeng,
Ramakrishnan T. S.,
Zhang Hua,
Wasan Darsh T.
Publication year - 2020
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16964
Subject(s) - capillary action , mechanics , dissipation , atmospheric pressure , newtonian fluid , chemistry , compression (physics) , thermodynamics , materials science , meteorology , physics
The spontaneous rise of Newtonian liquids in closed‐end capillaries is investigated with three different organics. Rise rate and equilibrium height are significantly reduced by a compression induced minor elevation in air pressure within the capillaries. We verify our earlier mathematical analysis quantifying viscous dissipation within air, and also show that the dynamic contact angle plays a material role. The relative importance of these varies with capillary dimensions. We also quantify the influence of atmospheric pressure variation and the temperature induced fluctuations in the rise height. A single parameter that relates static and dynamic contact angles is sufficient to match all of the data. This parameter is obtained from an open‐capillary experiment.