Viscosity of Slurry
The term slurry describes mixtures of a liquid and solid particles that retain some fluidity. The viscosity of slurry can be described as relative to the viscosity of the liquid phase:
where μs and μl are respectively the dynamic viscosity of the slurry and liquid (Pa·s), and μr is the relative viscosity (dimensionless).
Depending on the size and concentration of the solid particles, several models exist that describe the relative viscosity as a function of volume fraction ɸ of solid particles.
In the case of extremely low concentrations of fine particles, Einstein's equation may be used:
In the case of higher concentrations, a modified equation was proposed by Guth and Simha, which takes into account interaction between the solid particles:
Further modification of this equation was proposed by Thomas from the fitting of empirical data:
where A = 0.00273 and B = 16.6.
In the case of very high concentrations, another empirical equation was proposed by Kitano et al.:
where A = 0.68 for smooth spherical particles.
Read more about this topic: Viscosity Of Amorphous Materials