A Bingham plastic fluid has a value of τ0 = 1.2 N/m2 and a viscosity μ = 0.4 Pa s. The fluid is flowing at 5.70 × 10–5 m3/s in a pipe 2.5 m long with an internal diameter of 3.0 cm. Calculate the pressure drop (p0 – pL) in N/m2 and r0. (Hint: This is a trial-and-error solution. As a first trial, assume τ0 = 0)

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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.