THE PERFORMANCE OF EXPLICIT FORMULAS FOR DETERMINING THE DARCY-WEISBACH FRICTION FACTOR
| Autor: | João Carlos Cury Saad, Francisca Franciana Sousa Pereira, T.B.G. Silva, Evanize Rodrigues Castro, Renata Teixeira de Almeida Minhoni |
|---|---|
| Přispěvatelé: | Universidade Estadual Paulista (Unesp) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Pressure drop
absolute roughness Agriculture (General) Mathematical analysis Reynolds number Laminar flow 04 agricultural and veterinary sciences Agricultural and Biological Sciences (miscellaneous) Darcy–Weisbach equation S1-972 Hydraulic head symbols.namesake Friction factor forced conduits Approximation error head loss 040103 agronomy & agriculture symbols Darcy friction factor formulae 0401 agriculture forestry and fisheries Colebrook equation Mathematics hydraulic load |
| Zdroj: | Engenharia Agrícola, Vol 40, Iss 2, Pp 258-265 (2020) Engenharia Agrícola v.40 n.2 2020 Engenharia Agrícola Associação Brasileira de Engenharia Agrícola (SBEA) instacron:SBEA Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| ISSN: | 0100-6916 |
| Popis: | Made available in DSpace on 2020-12-10T17:30:58Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-03-01. Added 1 bitstream(s) on 2021-07-15T14:37:01Z : No. of bitstreams: 1 S0100-69162020000200258.pdf: 2643327 bytes, checksum: 904eb548266ecdee250b18e69a781a71 (MD5) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) School of Agronomic Sciences (FCA) at UNESP - Botucatu The Darcy-Weisbach equation is the most recommended equation for determining the pressure loss in pressurized pipes because of its wide applicability. However, one of the largest obstacles to implementing this equation is the friction factor (f) calculation. This factor can be precisely determined using the Colebrook equation, which is implicit. Thus, the objective of this study was to compare six explicit equations for calculating the Darcy-Weisbach friction factor with the implicit Colebrook equation based on the relative error. Based on the results, the equations of Vatankhah and Offor & Alabi were the most highly recommended. These six explicit formulas showed a mean relative error of less than 1% compared to the Colebrook equation, except for the Swamee and Jain equation, for which the laminar regime generated a mean relative error of 1.83%. Sao Paulo State Univ, Botucatu, SP, Brazil Sao Paulo State Univ, Botucatu, SP, Brazil CNPq: 140676/2017-1 |
| Databáze: | OpenAIRE |
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