3) Consider a double layer of immiscible fluids 1 and 2 with different viscosity and density, flowing steadily down and inclined plane, as in the figure given. The atmosphere exerts no shear stress on the surface and is at constant pressure. Find the laminar velocity distribution in the two layers. Obtain an expression for the velocity profile in the liquid film. Sketch the velocity profile.

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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.