Measurement of a structured backflow in an open small channel induced by surface-tension gradients.
Phys Rev Lett
; 110(21): 214506, 2013 May 24.
Article
em En
| MEDLINE
| ID: mdl-23745886
ABSTRACT
We present experiments in which the laterally confined flow of a surfactant film driven by controlled surface tension gradients causes the subtended liquid layer to self-organize into an inner upstream microduct surrounded by the downstream flow. The anomalous interfacial flow profiles and the concomitant backflow are a result of the feedback between two-dimensional and three-dimensional microfluidics realized during flow in open microchannels. Bulk and surface particle image velocimetry data combined with an interfacial hydrodynamics model explain the dependence of the observed phenomena on channel geometry.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Tensoativos
/
Microfluídica
/
Modelos Químicos
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article