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Capillary flow of water in tubes partially prefilled with oil

Claudiu Patrascu*,† and Ioana Rasuceanu†

  • Hydraulics Department, Politehnica University of Bucharest, RO-060042, Romania

  • *Corresponding author: claudiu.patrascu@upb.ro
  • †These authors contributed equally to this work.
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Phys. Rev. Fluids 7, 114001 – Published 10 November, 2022

DOI: https://doi.org/10.1103/PhysRevFluids.7.114001

Abstract

The paper is concerned with the capillary flow of water in tubes that are partially prefilled with sunflower oil. We study the system's dynamics as a function of the oil column's length in horizontal and vertical alignments. The study shows that, in a horizontal flow, a spontaneous process of water-droplet formation occurs at the level of the water-oil interface. We investigate this process as a function of the prefilling liquid's volume and describe how to manipulate the location of the breakup event by simply increasing the oil content that prefills the capillary tube. After droplet breakup, experimental observations on capillary intake reveal that for short length scales the liquid-liquid system moves with a constant velocity. We also show how theoretical models can be adapted to predict the position of the water-oil meniscus in time.

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Outline

Information

Phys. Rev. Fluids 7, 114001– Published 10 November, 2022
  • Received 14 June 2022
  • Accepted 25 October 2022
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