Lateral migration of neutrally buoyant rigid spheres in small ducts
Abstract
Velocity profiles were measured with a laser Doppler velocimeter in microducts for rigid spheres suspended in water to study blood flow in capillary tubes. Assuming Hagen-Poiseuille flow, concentration distribution in terms of number density over wall distance are obtained. Distributions indicate that the particles assemble at a stable position at a quarter duct width from the wall. No further lateral particle migration away from this stable position is observed. Particles, entering the duct near its centers reach this stable position within a downstream distance, which is 5.7 times longer than the corresponding distance for particles entering the duct near the wall. It is found that these distances are proportional to the ratio duct width/particle size. Optical observations of particle traces are also discussed.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- November 1980
- Bibcode:
- 1980STIN...8212406H
- Keywords:
-
- Blood Flow;
- Laser Doppler Velocimeters;
- Migration;
- Particle Motion;
- Capillary Flow;
- Ducted Flow;
- Floating;
- Laminar Flow;
- Velocity Distribution;
- Fluid Mechanics and Heat Transfer