# Dean-coupled inertial migration and transient focusing of particles in a curved microscale pipe flow

Dean-coupled inertial migration and transient focusing of particles in a curved microscale pipe flow The Dean-coupled inertial migration of neutrally buoyant spherical particles that are suspended in a curved microscale pipe flow was experimentally investigated in the range of $$6.4 \le {\text{Re}} \le 129$$ and $$1.69 \le De \le 34.1$$ . The three-dimensional positions of the particles were measured by using digital holographic microscopy. The diameter of the microtube was 350 μm, and the ratios of the tube diameter (D) to the particle diameter (d) were D/d = 12, 23, 35, and 50. Over a critical value of the Focusing number (F C), the particles were initially tubular-pinched at the entrance of the curved region. The detailed structures of the Segré–Silberberg annulus as well as its deformation attributed to secondary flow were analyzed. Diverse agglomeration patterns of particles corresponding to the various flow conditions were observed. The optimal conditions that induced the particles to focus at a certain lateral position were determined. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

# Dean-coupled inertial migration and transient focusing of particles in a curved microscale pipe flow

, Volume 53 (6) – Oct 20, 2012
11 pages

/lp/springer_journal/dean-coupled-inertial-migration-and-transient-focusing-of-particles-in-f67IqWsd1r
Publisher
Springer-Verlag
Subject
Engineering; Engineering Thermodynamics, Heat and Mass Transfer; Fluid- and Aerodynamics; Engineering Fluid Dynamics
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-012-1403-4
Publisher site
See Article on Publisher Site

### Abstract

The Dean-coupled inertial migration of neutrally buoyant spherical particles that are suspended in a curved microscale pipe flow was experimentally investigated in the range of $$6.4 \le {\text{Re}} \le 129$$ and $$1.69 \le De \le 34.1$$ . The three-dimensional positions of the particles were measured by using digital holographic microscopy. The diameter of the microtube was 350 μm, and the ratios of the tube diameter (D) to the particle diameter (d) were D/d = 12, 23, 35, and 50. Over a critical value of the Focusing number (F C), the particles were initially tubular-pinched at the entrance of the curved region. The detailed structures of the Segré–Silberberg annulus as well as its deformation attributed to secondary flow were analyzed. Diverse agglomeration patterns of particles corresponding to the various flow conditions were observed. The optimal conditions that induced the particles to focus at a certain lateral position were determined.

### Journal

Experiments in FluidsSpringer Journals

Published: Oct 20, 2012

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