Flow Properties of Cow's Milk

Abstract

On account for the dispersion state of cow's milk, flow properties of fresh milk, commercial milk and skim milk were carried out with a Maron-Belner type capillary viscometer under the various shear stresses.
Fresh milk showed the remarkable non-Newtonian flow behavior even at a low concentration of solid matter, however, commercial and skim milk showed the remarkable change of non-Newtonian flow or rather nearly Newtonian flow behavior at a lower concentration.
From these results, it means that the difference between the flow behaviors of these samples will depend on the aggregational effect occurred by milk fat droplets.
The viscosity of these samples showed nearly equivalent values at the higher shear stress than 10 dynes/cm², while the difference in viscosity of each sample was observed at the lower shear stress than that value.
Consequently, these aggregational changes may occur accompanying with the shear stresses.