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Turbulence length scale in pipe flow

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Old   September 26, 2002, 04:07
Default Turbulence length scale in pipe flow
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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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