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Issue 107, 2016, Issue in Progress
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Bubble generation in liquid rope coiling

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We present an experimental study of liquid rope coiling in order to explore different possibilities of air bubble generation in a viscous fluid. A column of viscous fluid falling on a smooth solid surface exhibits different behaviours, e.g., axisymmetric stagnation flow, coiling, rotatory folding, supercoiling, etc. These states provide ample opportunity for air to get trapped inside the body of a fluid. We investigate bubble generation mechanisms by studying the instability of a falling fluid rope and the characteristics of the observed bubbles. Our experiments show that a viscous rope undergoing supercoiling on the impact surface can, at times, produce a four-branched spiral pattern of bubbles. Finally, we provide a phase diagram illustrating the bubble properties relevant to the flow rate and fall height of the viscous jet. Our study provides a very simple method for the generation of mono/bi-dispersed bubbles in viscous fluids at high rates with an ability to tune the bubble size.

Graphical abstract: Bubble generation in liquid rope coiling

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Article information

14 Sep 2016
31 Oct 2016
First published
01 Nov 2016

RSC Adv., 2016,6, 105469-105475
Article type

Bubble generation in liquid rope coiling

H. Hosseini, A. Farnudi, M. H. Khatami and M. Habibi, RSC Adv., 2016, 6, 105469
DOI: 10.1039/C6RA23012A

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