The viscosity of a fluid is to be measured by an viscometer constructed of two 75-cm-long concentric cylinders. the outer diameter of the inner cylinder is 15 cm, and the gap between the two cylinders is 1 mm. the inner cylinder is rotated at 300 rpm, and the torque is measured to be 0.8 n·m. determine the viscosity of the fluid.

Viscosity of the fluid is

Explanation:

Given

The Area is given by

The velocity of the layer is layer is given by

Force acting by one layer of the fluid to other is given by F

Now from the Law of viscosity we have

Hence the viscosity of the fluid is

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