Buckingham-Reiner equation (Darcy friction factor for laminar flow)


An exact description of friction loss (Darcy Weisbach equation) for Bingham plastics in fully developed laminar pipe flow was first published by Buckingham. His expression, the Buckingham-Reiner equation, can be written in a dimensionless form as shown in this equation.

Related formulas


fLTurbulent flow friction factor (dimensionless)
ReReynolds number (dimensionless)
HeHedstrom number (dimensionless)
fLaminar flow friction factor (dimensionless)