Data/hora: 12/06/2024 12:45:44

Provedor de dados: 	91	
País: 	Brazil	
Título: 	Performance of explicit approximations of the coefficient of head loss for pressurized conduits	
Autores: 	Pimenta,Bruna D.; Robaina,Adroaldo D.; Peiter,Marcia X.; Mezzomo,Wellington; Kirchner,Jardel H.; Ben,Luis H. B.	
Data: 	2018-05-01	
Ano: 	2018	
Palavras-chave: 	Head loss; Darcy-Weisbach; Turbulent flow regime; Performance index.	
Resumo: 	ABSTRACT One of the parameters involved in the design of pressurized hydraulic systems is the pressure drop in the pipes. The verification of the pressure drop can be performed through the Darcy-Weisbach formulation, which considers a coefficient of head loss (f) that can be estimated by the implicit Colebrook-White equation. However, for this determination, it is necessary to use numerical methods or the Moody diagram. Because of this, numerous explicit approaches have been proposed to overcome such limitation. In this sense, the objective of this study was to analyze the explicit approximations of the f for pressurized conduits in comparison to the Colebrook-White formulation, determining the most precise ones so that they can be used as an alternative solution that is valid for the turbulent flow regime. Twenty nine explicit equations found in the literature were analysed, determining the f through the Reynolds number in the range of 4 × 103 ≤ Re ≤ 108 and a relative roughness (Ɛ/D) of 10-6 ≤ Ɛ/D ≤ 5 × 10-2, and obtaining 160 points for each equation. The performance index and relative error of the formulations were analyzed in relation to the Colebrook-White equation. Considering the equations analyzed, we found seven that presented excellent performance and high precision, highlighting the formulation of Offor &amp; Alabi, which can be used as an alternative to the Colebrook-White standard equation.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000500301	
Editor: 	Departamento de Engenharia Agrícola  - UFCG	
Relação: 	10.1590/1807-1929/agriambi.v22n5p301-307	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Engenharia Agrícola e Ambiental  v.22 n.5 2018	
Fonte: 	info:eu-repo/semantics/openAccess