Note: Constitutive Equation or Stress Calculator?

can be imposed, for instance, by moving apparatus walls. v(r, t) denotes the solvent velocity at a place of position vector r (relative to an origin 0 fixed in space) at time t; the velocity gradient tensor K is independent of r. v, denotes the solvent velocity at 0. If, as is usually assumed, inertial forces in the stress equation of motion can be neglected, addition of polymer results in addition of extra terms to (11, yielding an equation of the form