Particle Drag in colloids


by Wiemster
Tags: drag
Wiemster
Wiemster is offline
#1
Oct11-08, 08:30 AM
P: 72
How does one evaluate the drag force on a particle moving through a colloid? And how does this depend on the size of the particle compared to the constituents making up the collloid?

For particles much larger than the constituents I can imagine one can just do the same as for a normal fluid and use the various correlations that exist. If the rheology of the colloid is non-Newtonian I can imagine you evaluate the viscosity for a shear, characteristic to the moving particle. But I can also imagine the particle size matters. I would say for particle sizes much smaller than the colloid constituents, the viscous drag experienced by the particle is that of the liquid phase, the interaction with the constituents playing little role. Is that correct?

If so, how does the viscosity in the drag force expressions change with particle size relative to the colloid constituents?

Any experience, refererences, thoughts, comments are welcome!
Phys.Org News Partner Engineering news on Phys.org
Lifting the brakes on fuel efficiency
PsiKick's batteryless sensors poised for coming 'Internet of things'
Researcher launches successful tech start-up to help the blind
Wiemster
Wiemster is offline
#2
Oct16-08, 06:36 AM
P: 72
No colloidal chemists / physicists on this forum with knowledge on the subject?

The specific case I have in mind is that of particles moving through blood, anybody knows of any experiments/simulations reporting on this issue?


Register to reply

Related Discussions
Particle System (Gravity, Buoyancy and Drag), need help! General Physics 4
colloids solid or liquid? Chemistry 7
Voltammetry of alkylated colloids Chemistry 3
elasticity in colloids (gels, jellies) Chemistry 0
elasticity in colloids (gels, jellies) General Physics 0