SEARCH Articles Figures Tables Circular ducts entry length Circular ducts rough Circular ducts with fins Circular sector ducts Ducting Ducts EPR in ducts with non-circular cross sections Elliptical Ducts with Centered Circular Cores Hagen-Poiseuille Flow in a Circular duct Laminar flow of inelastic fluids in non-circular ducts Regular Polygonal Ducts with Centered Circular Cores Triangular Ducts with Inscribed Circular Cores Turbulent Flow in Straight, Smooth Ducts, Pipes, and Tubes of Circular Cross Section