What is the process to calculate the Reynold number?

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Carlos Araújo Queiroz

I suppose you refer to the equivalent hydraulic diameter for non-circular ducts; cf. (e.g.):

https://www.engineeringtoolbox.com/hydraulic-equivalent-diameter-d_458.html

https://en.wikipedia.org/wiki/Hydraulic_diameter

V R Arun Prakash

Try using flow analysis setup whete yiu can find the Reynolds number

Rubel Ahmed

Thanks V R Arun Prakash