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Friction Coefficient vs. Reynolds-X

  • Friction coefficient $ C_f$ versus Reynolds based on x coordinate $ Re_x$ at the flat plate.
  • Equations ([*]) show experimental correlation of various measurements.
  • For laminar fluid flows at the flat plate the Blasius formula is used.
  • For turbulent fluid flows at the flat plate the White formula is used.

 

 

$\displaystyle \textrm{Blasius:} \quad C_f = \frac{0.664}{Re_x^\frac{1}{2}} , \quad \textrm{White:} \quad C_f = \frac{0.445}{ln^2 (0.06 \cdot Re_x)}$(25.1)

 

 

where:

 

 

$\displaystyle Re_x = \frac{\rho_\infty U_\infty x}{\mu_\infty}$(25.2)

Figure: Friction coefficient versus Reynolds based on x coordinate at the flat plate. Equations show experimental correlation of various measurements. For laminar fluid flows at the flat plate the Blasius formula is used. For turbulent fluid flows at the flat plate the White formula is used.

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