Knowledge card
Standard skin friction retains the dynamic-pressure factor
With C_f = τ_w/(½ρ_fU_w²), the reduced result is ½Re_x^{1/2}C_f = (φ_μ+ε)f″(0) − (εδ/3)f″(0)³. Omitting the half is permissible only when a nonstandard τ_w/(ρ_fU_w²) definition is stated.
Dimension I
Definition
What it is — and what it is not
- What it is
- S1Correction and justification — With C_f = τ_w/(½ρ_fU_w²), the reduced result is ½Re_x^{1/2}C_f = (φ_μ+ε)f″(0) − (εδ/3)f″(0)³. Omitting the half is permissible only when a nonstandard τ_w/(ρ_fU_w²) definition is stated. [1.1]
Dimension II
In practice
How to deal with it
No practical guidance recorded yet.
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