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Drainage-induced spontaneous film climbing in capillaries

P. Pirdavari, H. Tran, Z. He, and M. Y. Pack*

  • Department of Mechanical Engineering, Baylor University, One Bear Place #97356, Waco, Texas 76798, USA

  • *Contact author: min_pack@baylor.edu
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Phys. Rev. Fluids 9, 094005 – Published 16 September, 2024

DOI: https://doi.org/10.1103/PhysRevFluids.9.094005

Abstract

This study reports the ability with which surface tension gradients are formed plainly by the drainage in a capillary containing a surfactant-laden liquid slug initially held in place by a vacuum. Provided that a thin film forms on the walls transverse to the downward flow, the drainage induces a surfactant gradient (i.e., Marangoni effect), which then leads to a film-climbing event against gravity. The overall climbing effect is limited by the capillary rise height (i.e., propensity for infiltration due to surface tension) and the surfactant gradient formed postmeniscus drainage, thus revealing a twofold role of surface tension in gravity-oriented capillaries hitherto unexplored. The interplay of mechanisms influencing the climbing films include surfactant kinetics, diffusion, and advection of surfactants.

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Outline

Information

Phys. Rev. Fluids 9, 094005– Published 16 September, 2024
  • Received 16 April 2024
  • Accepted 27 August 2024
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