SAE-10 oil at 20 deg C fills the gap between the moving  6 cm diameter long cylinder which is inside a fixed outer cylinder 6.8 cm diameter. Calculate the  pressure gradient per unit length needed so the shear stress on the outer cylinder is exactly equal to zero when the inner cylinder is moving with velocity  V=4 m/s in the negative z-direction. Assume laminar flow. The viscosity of the oil is 99.2 cp. Express your result in kPa/m and round your numerical answer to a whole number

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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.