ABSTRACT
As discussed in Section 3.3, the energy dissipation Wd per second due to flow in a liquid is equal to the applied stress σ times the change in strain per second. For shear flow, this gives
Wd = =σγ ηγ 2, (10.1)
which is identical to Equation 3.19b. Equation 10.1 illustrates that η is a measure of energy dissipation, like G″ = η/ω in oscillatory tests (Section 7.4). Because shear rate γ is measured macroscopically for dispersions as a whole, every local increase in shear rate (e.g., around a dispersed particle) leading to extra energy dissipation will result in an increase in the calculated viscosity of the dispersion.
