Round 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. One form of this quantity is divided by another to calculate Trouton’s ratio. (-5[1])Forces named for this quantity dominate (-5[1])in the boundary layer. When this quantity is zero, the Navier-Stokes (15[1])equations simplify (15[1])to the (15[1])Euler (15[1])equations. In (-5[1])(*) thixotropic materials, this quantity decreases when a stress is applied. (10[1])This quantity does not change under shear stress for a Newtonian fluid. This quantity comes in “dynamic” and “kinematic” forms and is zero for superfluids. For 10 points, name this measure of a fluid’s resistance to flow. ■END■ (10[3])

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