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Why do we use friction Reynolds number in turbulence?

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January 27, 2021, 14:40	Why do we use friction Reynolds number in turbulence?	#1
Moreza7 Senior Member Join Date: Jan 2018 Posts: 121 Rep Power: 8	Hello, I was just reading some turbulent flow papers and most of them used friction Reynolds number: $Re_{\tau}=\frac{u_{\tau}h}{\nu}$ where: $u_{\tau}=\sqrt{\frac{\tau_{w}}{\rho}}$ Why do they use friction Reynolds number? Does it have any advantages or special concept?

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