Closed‐end capillary rise—An experimental study. Issue 6 (30th March 2020)

• Record Type: Journal Article
• Authors: Wu, Pingkeng; Ramakrishnan, T. S.; Zhang, Hua; Wasan, Darsh T.
• Is Part Of: AIChE journal. Volume 66:Issue 6(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-03-30
• Subjects: closed capillary -- compressible laminar flow -- dynamic contact angle; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; 660.28
• DOI: 10.1002/aic.16964
• Languages: English
• ISSNs: 0001-1541

Abstract

Abstract: 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.