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

Elements Of Electromagnetics
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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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