Calculation uses an equation that simulates the Moody Diagram. Turbulent or laminar flow.
To: LMNO Engineering home page
Design of Circular Liquid or Gas Pipes Calculator Trouble printing?
Kinematic viscosity (v) depends on the fluid (water, air,
etc.). Click for table.
Surface roughness depends on the duct material (steel, plastic, iron, etc.). Click for table.
The equations used in this program represent the Moody diagram which is the old-fashioned way of finding f. You may enter numbers in any units, so long as you are consistent. (L) means that the variable has units of length (e.g. meters). (L3/T) means that the variable has units of cubic length per time (e.g. m3/s). The Moody friction factor (f) is used in the Darcy-Weisbach major loss equation. Note that for laminar flow, f is independent of e. However, you must still enter an e for the program to run even though e is not used to compute f. Equations can be found in Discussion and References for Closed Conduit Flow.
A more complicated equation which represents a slightly larger range of Reynolds
numbers and e/D's is used in Design of Circular Liquid or Gas
© 1998-2001 LMNO Engineering, Research, and Software, Ltd. (All Rights Reserved)
LMNO Engineering, Research, and Software, Ltd.
7860 Angel Ridge Rd. Athens, Ohio USA (740) 592-1890