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COMPARISON of FRICTION FACTOR EQUATIONS FOR NON‐NEWTONIAN FLUIDS IN PIPE FLOW 1
Author(s) -
GARCIA EDGARDO J.,
STEFFE JAMES F.
Publication year - 1986
Publication title -
journal of food process engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 45
eISSN - 1745-4530
pISSN - 0145-8876
DOI - 10.1111/j.1745-4530.1986.tb00120.x
Subject(s) - laminar flow , pressure drop , friction factor , friction loss , turbulence , mechanics , reynolds number , bingham plastic , newtonian fluid , flow (mathematics) , non newtonian fluid , pipe flow , herschel–bulkley fluid , yield (engineering) , parasitic drag , thermodynamics , materials science , rheology , physics
The pressure drop, due to friction, in pipe flow of non‐Newtonian fluids can be estimated if the friction factor is known. For laminar flow, the friction factor for power law, Bingham plastic and Herschel‐Bulkely fluids can be obtained from a single theoretical relationship. However, a number of different relationships have been developed for turbulent flow. This paper presents a summary and comparison of these relationships. Friction factor predictions were found to differ significantly depending on the flow behavior index, Reynolds number and Hedstrom number. Generally, the spread of predictions increased as the fluid deviated from Newtonian behavior. Significant errors can be made when using relationships based on fluids without a yield stress to predict friction factors for fluids having a yield stress.