A single-cylinder rotational viscometer is used to measure a liquid with viscosity of 100 cP using a spindle with 6 cm length and 1 cm radius. At maximum shear rate (rpm560), the measurements approach a full-scale reading of 100. Determine the spindle dimensions that will allow the viscometer to measure viscosities up to 10,000 cP at maximum shear rate. Answer is 1.293 cm

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Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.