Question: A rotational viscometer is designed according to the Figure 1 shown below. A viscous liquid (incompressible and Newtonian fluid with density P and viscosity (l)

A rotational viscometer is designed according to the Figure 1 shown

A rotational viscometer is designed according to the Figure 1 shown below. A viscous liquid (incompressible and Newtonian fluid with density P and viscosity (l) is placed in the region between two coaxial cylinders with length L. The inner one (radius KR) rotates at an angular velocity 12 and the outer one (outer radius R) is fixed due to a weight Was shown in the Figure 1. Please find the torque on the outer cylinder applied by the rotational fluid using equations of change. Also calculate the required W to fix the outer cylinder. Note that L/R>>1, so only Ve exists and Ve is a function of r (radial coordinate) only. Please also note that pressure is not a function of 0. . Rub w Figure 1 A rotational viscometer

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