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Mapping outcomes of liquid marble collisions

Draper, Thomas C.; Fullarton, Claire; Mayne, Richard; Phillips, Neil; Canciani, Giacomo E.; De Lacy Costello, Ben P.J.; Adamatzky, Andrew

Authors

Thomas Draper Tom.Draper@uwe.ac.uk
Research Associate in Chemistry and Unconventional Computing

Claire Fullarton Claire.Fullarton@uwe.ac.uk
Research Associate in Chemistry anf Material Sciences (Liquid Marbles)

Richard Mayne Richard.Mayne@uwe.ac.uk
Lecturer in Maths Supporting Science

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Dr Neil Phillips Neil.Phillips@uwe.ac.uk
Research Associate in CWCR (ENDOWS Drought)

Giacomo E. Canciani



Abstract

© 2019 The Royal Society of Chemistry. Liquid marbles (LMs) have many promising roles in the ongoing development of microfluidics, microreactors, bioreactors, and unconventional computing. In many of these applications, the coalescence of two LMs is either required or actively discouraged, therefore it is important to study liquid marble collisions and establish parameters which enable the desired collision outcome. Recent reports on LM coalescence have focused on either two mobile LMs colliding, or an accelerating LM hitting a sessile LM with a backstop. A further possible scenario is the impact of a mobile LM against a non-supported static LM. This paper investigates such a collision, using high-speed videography for single-frame analysis. Multiple collisions were undertaken whilst varying the modified Weber number (We∗) and offset ratios (X∗). Parameter ranges of 1.0 < We∗ < 1.4 and 0.0 < X∗ < 0.1, resulted in a coalescence rate of approximately 50%. Whereas, parameter ranges X∗ > 0.25, and We∗ < 0.95 or We∗ > 1.55 resulted in 100% non-coalescence. Additionally, observations of LMs moving above a threshold velocity of 0.6 m s -1 have revealed a new and unusual deformation. Comparisons of the outcome of collisions whilst varying both the LM volume and the powder grain size have also been made, revealing a strong link. The results of this work provide a deeper understanding of LM coalescence, allowing improved control when designing future collision experiments.

Journal Article Type Article
Publication Date Apr 30, 2019
Journal Soft Matter
Print ISSN 1744-683X
Electronic ISSN 1744-6848
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 15
Issue 17
Pages 3541-3551
APA6 Citation Draper, T. C., Fullarton, C., Mayne, R., Phillips, N., Canciani, G. E., De Lacy Costello, B. P., & Adamatzky, A. (2019). Mapping outcomes of liquid marble collisions. Soft Matter, 15(17), 3541-3551. https://doi.org/10.1039/c9sm00328b
DOI https://doi.org/10.1039/c9sm00328b
Keywords liquid marble, unconventional computing, microfluidics, coalescence control, weber number, high-speed photography, fluid dynamics
Publisher URL http://doi.org/10.1039/C9SM00328B

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