How does particle size affect drag force in colloids?

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SUMMARY

The discussion focuses on evaluating the drag force on particles moving through colloids, specifically addressing how particle size influences this force. For particles significantly larger than the colloid constituents, traditional fluid dynamics correlations apply. In contrast, for particles much smaller than the constituents, the drag force primarily reflects the viscosity of the liquid phase, with minimal interaction from the colloidal particles. The conversation highlights the need for further exploration of viscosity changes in drag force expressions relative to particle size, particularly in biological contexts like blood flow.

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  • Understanding of colloidal systems and their rheological properties
  • Familiarity with fluid dynamics principles, particularly drag force calculations
  • Knowledge of non-Newtonian fluid behavior
  • Basic concepts of particle size distribution in colloids
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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!
 
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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?
 

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