Jump to main content
Jump to site search


Bubble propagation on a rail: a concept for sorting bubbles by size

Author affiliations

Abstract

We demonstrate experimentally that the introduction of a rail, a small height constriction, within the cross-section of a rectangular channel could be used as a robust passive sorting device in two-phase fluid flows. Single air bubbles carried within silicone oil are generally transported on one side of the rail. However, for flow rates marginally larger than a critical value, a narrow band of bubble sizes can propagate (stably) over the rail, while bubbles of other sizes segregate to the side of the rail. The width of this band of bubble sizes increases with flow rate and the size of the most stable bubble can be tuned by varying the rail width. We present a complementary theoretical analysis based on a depth-averaged theory, which is in qualitative agreement with the experiments. The theoretical study reveals that the mechanism relies on a non-trivial interaction between capillary and viscous forces that is fully dynamic, rather than being a simple modification of capillary static solutions.

Graphical abstract: Bubble propagation on a rail: a concept for sorting bubbles by size

Back to tab navigation

Supplementary files

Publication details

The article was received on 25 Jul 2017, accepted on 03 Nov 2017 and first published on 03 Nov 2017


Article type: Paper
DOI: 10.1039/C7SM01478C
Citation: Soft Matter, 2017, Advance Article
  •   Request permissions

    Bubble propagation on a rail: a concept for sorting bubbles by size

    A. Franco-Gómez, A. B. Thompson, A. L. Hazel and A. Juel, Soft Matter, 2017, Advance Article , DOI: 10.1039/C7SM01478C

Search articles by author

Spotlight

Advertisements