Issue |
EPL
Volume 80, Number 3, November 2007
|
|
---|---|---|
Article Number | 34001 | |
Number of page(s) | 6 | |
Section | Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics | |
DOI | https://doi.org/10.1209/0295-5075/80/34001 | |
Published online | 24 September 2007 |
Rheology and dynamics of a deformable object in a microfluidic configuration: A numerical study
Laboratoire de Spectrométrie Physique, Université Joseph Fourier - Grenoble 1, BP87, F-38402 Saint Martin d'Hères, France
Received:
24
January
2007
Accepted:
3
September
2007
A dilute suspension is studied in a confined geometry with a 3D
numerical simulation. The suspended element is a non-Brownian elastic dumbbell. The suspension is confined between two walls in a shear flow.
The dynamics of the dumbbell as well as the associated rheology are presented. Despite its simplicity, the system exhibits generic microscopic behaviours of real deformable objects such as vesicles,
biological cells or capsules like tumbling or vacillating-breathing. It also reproduces macroscopic behaviours like a shear thinning viscosity characteristic of
complex fluids rheology. In addition, the model predicts a confinement law where the intrinsic viscosity varies as
for sufficiently strong confinements (c is the
ratio of dumbbell size over the wall-to-wall distance). A transition from a tumbling regime towards a vacillating-breathing one is found.
This mode is promoted further by confinement.
PACS: 47.63.mf – Low-Reynolds-number motions / 47.61.-k – Micro- and nano- scale flow phenomena / 47.57.Qk – Rheological aspects
© Europhysics Letters Association, 2007
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.