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@ARTICLE{Schiller:202857,
author = {Schiller, Ulf D. and Fleury, Jean-Baptiste and Seemann,
Ralf and Gompper, Gerhard},
title = {{C}ollective waves in dense and confined microfluidic
droplet arrays},
journal = {Soft matter},
volume = {11},
number = {29},
issn = {1744-6848},
address = {London},
publisher = {Royal Soc. of Chemistry},
reportid = {FZJ-2015-05009},
pages = {5850 - 5861},
year = {2015},
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.},
cin = {IAS-2 / ICS-2},
ddc = {530},
cid = {I:(DE-Juel1)IAS-2-20090406 / I:(DE-Juel1)ICS-2-20110106},
pnm = {551 - Functional Macromolecules and Complexes (POF3-551)},
pid = {G:(DE-HGF)POF3-551},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000358216800008},
pubmed = {pmid:26107262},
doi = {10.1039/C5SM01116G},
url = {https://juser.fz-juelich.de/record/202857},
}