Prediction of the friction factor in pipes using model tree. Issue 1 (2nd January 2018)

• Record Type: Journal Article
• Authors: Najafzadeh, Mohammad; Shiri, Jalal; Sadeghi, Gholamabbas; Ghaemi, Alireza
• Is Part Of: ISH journal of hydraulic engineering. Volume 24:Issue 1(2018)
• Page Start: 9
• Page End: 15
• Publication Date: 2018-01-02
• Subjects: Friction factor -- model tree -- pipe -- explicit expressions; Hydraulic engineering -- Periodicals; Hydraulic engineering -- India -- Periodicals; Hydraulic engineering; India; Periodicals; 627
• DOI: 10.1080/09715010.2017.1333926
• Languages: English
• ISSNs: 0971-5010

Abstract

Abstract: Prediction of friction factor plays a prominent role in determination of head losses along pipelines or water distribution systems. Numerous traditional equations-based regressive models have been extracted for prediction of the friction factor using experimental and numerical studies. In the present research, a model tree (MT) was developed to present formulations for evaluation of friction factor in pipes. The effective parameters on the friction factor ( f ), included pipe diameter ( D ), average flow velocity in pipe ( V ), kinematic viscosity (ν), and roughness height of the inner surface of pipe (ɛ). Two non-dimensional parameters of the fluid, Reynolds number ( Re ) and relative roughness (ɛ/D) were employed to improve the proposed model. The training and testing of MT approach were carried out using datasets obtained from the approximate solution. The testing results for the MT were compared with those obtained using gene-expression programming (GEP), evolutionary paradigm regression (EPR), and conventional approaches. Compared to the conventional models and artificial intelligence techniques, MT was manifest that permissible degree of accuracy for evaluation of friction factor was met.