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

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