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Pressure drop across sand and recycled glass media used in micro irrigation filters

Filtration is necessary for avoiding emitter clogging in micro irrigation systems. The pressure drop across different granular media, such as silica sand, crushed recycled glass, surface modified glass and glass microspheres of selected grain sizes ranging from 0.63 to 1.50 mm, was studied in a laboratory filter scaled from a commercial filter using tap water. Real and bulk densities, porosity, sphericity and the equivalent diameter of these media were measured. The pressure loss was also measured at filter surface velocities from 0.004 to 0.025 m s−1. The pressure losses for the silica sand, crushed glass and modified glass were 39%, 27% and 10% lower than that for microspheres. The experimental results were compared with predicted values calculated using Ergun and Kozeny–Carman equations, as well as other multiple linear equations obtained with the stepwise methodology. Although the Ergun equation was the most accurate for predicting pressure drop, a newly developed equation that requires only grain size as the physical parameter of each medium also showed good performance and it may be of interest for use by irrigation engineers

The authors would like to express their gratitude to the Spanish Ministry of Economy and Competitiveness for its financial support of this study through Grant CGL2012-31180

Elsevier

Manager: Ministerio de Economía y Competitividad (Espanya)
Author: Bové Masmiquel, Josep
Arbat Pujolràs, Gerard
Duran i Ros, Miquel
Pujol i Sagaró, Toni
Velayos Solé, Joaquim
Ramírez de Cartagena Bisbe, Francisco
Puig Bargués, Jaume
Abstract: Filtration is necessary for avoiding emitter clogging in micro irrigation systems. The pressure drop across different granular media, such as silica sand, crushed recycled glass, surface modified glass and glass microspheres of selected grain sizes ranging from 0.63 to 1.50 mm, was studied in a laboratory filter scaled from a commercial filter using tap water. Real and bulk densities, porosity, sphericity and the equivalent diameter of these media were measured. The pressure loss was also measured at filter surface velocities from 0.004 to 0.025 m s−1. The pressure losses for the silica sand, crushed glass and modified glass were 39%, 27% and 10% lower than that for microspheres. The experimental results were compared with predicted values calculated using Ergun and Kozeny–Carman equations, as well as other multiple linear equations obtained with the stepwise methodology. Although the Ergun equation was the most accurate for predicting pressure drop, a newly developed equation that requires only grain size as the physical parameter of each medium also showed good performance and it may be of interest for use by irrigation engineers
The authors would like to express their gratitude to the Spanish Ministry of Economy and Competitiveness for its financial support of this study through Grant CGL2012-31180
Document access: http://hdl.handle.net/2072/299108
Language: eng
Publisher: Elsevier
Rights: Tots els drets reservats
Subject: Regatge per degoteig
Trickle irrigation
Filtres i filtració
Filters and filtration
Title: Pressure drop across sand and recycled glass media used in micro irrigation filters
Type: info:eu-repo/semantics/article
Repository: Recercat

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