Fator de atrito em tubos de polietileno de pequenos diâmetros - DOI: 10.4025/actasciagron.v30i3.3497

Gabriel Greco Guimarães Cardoso; José Antônio Frizzone; Roberto Resende

doi:10.4025/actasciagron.v30i3.3497

Friction factor for small diameter polyethylene pipes - DOI: 10.4025/actasciagron.v30i3.3497

Gabriel Greco Guimarães Cardoso ESALQ
José Antônio Frizzone USP
Roberto Resende UEM

DOI: https://doi.org/10.4025/actasciagron.v30i3.3497

Keywords: head loss, turbulent flow, Blasius equation, Darcy-Weisbach equation

Abstract

On this paper, the results of an experimental study on the hydraulic friction loss for small-diameter polyethylene pipes are reported. The experiment was carried out using a range of Reynolds number between 6000 to 72000, obtained by varying discharge at 20ºC water temperature, with internal pipe diameters of 10.0 mm, 12.9 mm, 16.1 mm, 17.4 mm and 19.7 mm. According to the analysis results and experimental conditions, the friction factor (f) of the Darcy-Weisbach equation can be estimated with c = 0.300 and m = 0.25. The Blasius equation (c = 0.316 and m = 0.25) gives an overestimate of friction loss, although this fact is non-restrictive for micro-irrigation system designs. The analysis shows that both the Blasius and the adjusted equation parameters allow for accurate friction factor estimates, characterized by low mean error (5.1%).

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Author Biography

José Antônio Frizzone, USP

Possui graduação em Agronomia pela Universidade Federal de Viçosa (1977) , especialização em Irrigação e Métodos de Extensão pelo Ministério de Relações Exteriores Divisão de Cooperação Internacional (1981) , mestrado em Engenharia Agrícola pela Universidade Federal de Viçosa (1979) e doutorado em Agronomia pela Escola Superior de Agricultura Luiz de Queiroz (1986) . Atualmente é Professor Titular da Universidade de São Paulo. Tem experiência na área de Agronomia , com ênfase em Irrigação e Drenagem. Atuando principalmente nos seguintes temas: Programação linear, Otimização, Maximização de lucro, Alocação de água Currículo Lattes

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Published

2008-05-27

How to Cite

Cardoso, G. G. G., Frizzone, J. A., & Resende, R. (2008). Friction factor for small diameter polyethylene pipes - DOI: 10.4025/actasciagron.v30i3.3497. Acta Scientiarum. Agronomy, 30(3), 299-305. https://doi.org/10.4025/actasciagron.v30i3.3497

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Issue

Vol 30 No 3 (2008)

Section

Agricultural Engineering

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