December 1997

Valves/Piping

Simple method determines flow regime for friction factor calculations

Use these criteria to avoid trial-anderror procedures

Kumar, S., Consultant; Gulyani, B. B., Jain, A., Mohanty, B., Department of Chemical Engineering

Fluid flow through pipe experiences resistance due to viscosity, fluid turbulence and pipe surface roughness. Surface roughness is a major contributor to flow resistance. Roughness resistance (friction factor) calculations have required a tedious procedure to determine flow regime. The new simple and explicit criteria presented can be used to easily determine flow regime. Introduction. For analyzing steady-state Newtonian fluid flow in pipe, the Darcy Weisbach equation, Eq. 1 is most commonly used. It provides the necessary relation between head loss due to surface resistance, fluid properties and pipe geometry as:     Where, f is the coefficient of

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