2.27 Fluids of viscosities µ1 = 0.1 N · s/m² and µ2 = 0.15 N - s/m? are contained between two plates (each plate is 1 m? in area). The thicknesses are h1 upper plate moves at a velocity of 1.5 m/s. Determine the force required to move the upper plate and the fluid velocity at the interface between the two fluids. = 0.5 mm and h2 = 0.3 mm, respectively. And the F, V h2 H2 h1 P2.27 lint: Both Velocity and Shear stress are continuous at the fluid-fluid interface.

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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.