4.14A molten polymer is to-be coated on a cable at a speed of 0.5 m/s. The cable diameter is 15 mm and the coating thickness required is 0.3 mm. The die used has a length of 60 mm and an internal diameter of 16 mm. What pressure must be developed at the die entry if the viscosity of the polymer under these operating conditions is 100 Pa.s?

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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.