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  Collective waves in dense and confined microfluidic droplet arrays

Schiller, U. D., Fleury, J.-B., Seemann, R., & Gompper, G. (2015). Collective waves in dense and confined microfluidic droplet arrays. Soft Matter, 11(29), 5850-5861. doi:10.1039/c5sm01116g.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-5EF4-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-C068-D
Genre: Journal Article

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 Creators:
Schiller, Ulf D., Author
Fleury, Jean-Baptiste, Author
Seemann, Ralf1, Author              
Gompper, Gerhard, Author
Affiliations:
1Group Geometry of Fluid Interfaces, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063311              

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 Abstract: Excitation mechanisms for collective waves in confined dense one-dimensional microfluidic droplet arrays are investigated by experiments and computer simulations. We demonstrate that distinct modes can be excited by creating specific ‘defect’ patterns in flowing droplet trains. Excited longitudinal modes exhibit a short-lived cascade of pairs of laterally displacing droplets. Transversely excited modes obey the dispersion relation of microfluidic phonons and induce a coupling between longitudinal and transverse modes, whose origin is the hydrodynamic interaction of the droplets with the confining walls. Moreover, we investigate the long-time behaviour of the oscillations and discuss possible mechanisms for the onset of instabilities. Our findings demonstrate that the collective dynamics of microfluidic droplet ensembles can be studied particularly well in dense and confined systems. Experimentally, the ability to control microfluidic droplets may allow the modulation of the refractive index of optofluidic crystals, which is a promising approach for the production of dynamically programmable metamaterials.

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Language(s): eng - English
 Dates: 2015-06-082015
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1039/c5sm01116g
BibTex Citekey: schiller-sm-2015
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Title: Soft Matter
Source Genre: Journal
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Pages: - Volume / Issue: 11 (29) Sequence Number: - Start / End Page: 5850 - 5861 Identifier: ISSN: 1744-683X