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I work in a lab and i was given the mission of identifing the reynolds in a square pipe, in different flow rates I have the dimentions of the rectangle - 5cm X 6cm, and I have the flow rate. the fluid is air (so I also have the charecteristics of the fluid) what is the characteristic length here? and can i assume the speed of the air is the same in all the cross section? (we are talking about q between 30-100 m^3 per hour)

thank you.

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  • $\begingroup$ search "Reynolds number" and "hydraulic diameter" $\endgroup$
    – Solar Mike
    Commented Nov 21, 2017 at 11:40

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So, using the formula Hd = (4 * A) / wet perimeter then with 5 and 6 given the Hd is 5.455.

For reference see here : Hydraulic Diameter

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