A stirrer in constructed as shown in Fig.. The dimensions are indicated in the figure. The stirrer speed is 90 rpm. Determine the torque on the shaft and also the power required. Assume the vessel is large. Neglect the drug on the rod and the shaft. Density of the fluid is 1025 kg/m3

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Fluid Materials

In general terms, anything that flows can be termed as a fluid. In other words, a fluid is any substance that cannot resist shear forces and deforms continuously under the application of external shear forces. Fluid materials differ completely from solid materials such as metals and alloys. For instance, if we consider two infinitesimally small cross-sectional areas of fluid materials and solid materials, and apply shear forces to these elements, both the elements will undergo deformation. Upon releasing the shear force, the element of the solid materials will regain its original orientation, but the element of the fluid materials will keep on deforming continuously under the action of the shear force.