rho_s     1180[kg/m^3]  Density of solid particles
rho_f     1253[kg/m^3]  Density of pure fluid
eta_f     0.5889[Pa*s]  Viscosity of pure fluid
phi_max   0.64          Maximum packing
phi0      0.35          Average concentration
R         0.397[mm]     Particle radius
RPM       55[1/min]     Revolutions per minute
c_vel     2*pi*RPM      Scaling of velocity