Packet 3: Tossup 9

An “apparent” form of this quantity equals the velocity gradient to the power of the behavior index minus one in the Ostwald-de Waele power law. (15[1])One form (15[1])of this quantity is divided by another to calculate Trouton’s ratio. (-5[5])Forces named for (-5[1])this quantity (-5[4])dominate (-5[2])in the boundary layer. When this (15[1])quantity is zero, the Navier-Stokes (15[2])equations (15[2])simplify (15[2])to the (15[1])Euler (15[2])equations. (15[1]0[1])In (-5[1])(*) thixotropic (10[2])materials, (10[2])this quantity (10[2])decreases when a stress is applied. (10[1])This quantity does not (10[1])change under (10[1])shear (10[1])stress (10[1])for a Newtonian (10[1])fluid. (10[1]-5[1])This quantity (10[1])comes (10[1])in (10[1])“dynamic” (10[1])and “kinematic” forms (10[3])and is zero for superfluids. For 10 points, (10[1])name this measure of a fluid’s resistance to flow. (10[1])■END■ (10[9])

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