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

Description

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

Variables

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