The area between two infinite flat parallel sheets which are placed 10mm away from each other is occupied with a fluid having dynamic viscosity 0.5Pa.s. Through this distance between the sheets a plate with small thickness and cross sectional area 0.1m2 is being pulled. Considering the plate is at 4mm distance from one of the sheets and the velocity distribution is linear determine the amount of force which is needed to pull the plate.

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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.