Water flows in a pipe of circular cross-section of diameter D at a mean velocity of v. The dynamic viscosity of the water is µ, the density of the water is ρ. The diameter-based Reynolds-number of the pipe flow is Re=300. What is the pipe friction factor? λ=?    a. λ = v·D·ρ/µ b. λ = 32·v·D·ρ/µ/Re c. λ = (v·ρ/µ)2 d. λ = 64/Re

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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.