entrance length
Dear Dr.
Taha Ahmed Abdullah
You can read
http://rdo.psu.ac.th/sjstweb/journal/36-4/36-4-13.pdf
https://www.researchgate.net/publication/289002737_Investigation_of_entrance_length_in_circular_and_noncircular_conduits_by_computational_fluid_dynamics_simulation
with best wishes
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