Fluid Mechanics in SWCE

In fully developed laminar flow of water through a horizontal circular pipe of diameter $D$, the Darcy-Weisbach friction factor $f$ varies with Reynolds number $Re$ as:

Options:

• (A) $f = \frac{64}{Re}$
• (B) $f = \frac{16}{Re}$
• (C) $f = \frac{0.316}{Re^{0.25}}$
• (D) $f = \frac{0.079}{Re^{0.25}}$