Flow lines and mixing within drops in microcapillaries.
Phys Rev E Stat Nonlin Soft Matter Phys
; 80(6 Pt 2): 066316, 2009 Dec.
Article
em En
| MEDLINE
| ID: mdl-20365276
ABSTRACT
We present a theoretical and numerical investigation of streamlines and mixing within drops flowing in capillaries. We first study theoretically the limit case of purely viscous flow around a drop of negligible radius, and find that, owing to geometrical constraints, recirculating regions are always present at the front and back of such drops. Using two-dimensional simulations, we visualize streamlines for larger drops, showing that the extent of these recirculating torii increases with drop size and decreases with Reynolds number. We study the mixing within drops as they are subjected to time-dependent shear, thus modeling a sinusoidal channel, and find that while cross-stream mixing is efficient, streamwise mixing is hindered by the front and back recirculating regions.
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Base de dados:
MEDLINE
Assunto principal:
Biofísica
/
Microfluídica
/
Técnicas Analíticas Microfluídicas
Idioma:
En
Ano de publicação:
2009
Tipo de documento:
Article