Turbulence length scale in pipe flow
Hi, I am using Airpak of Fluent Inc. In the mannual, I found that the turbulence length scale in fully-developed turbulent pipe flow is about 7% of the hydraulic diameter. [Charpter 6, pp.6-25]
Could anyone tell me that where I can find the exact source of this expression, in which book, and what pages?
Thanks very much.
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