Pressure drop across sand and recycled glass media used in micro irrigation filters
| Autor: | Josep Bové, Joaquim Velayos, Gerard Arbat, Toni Pujol, Francisco Ramírez de Cartagena, M. Duran-Ros, Jaume Puig-Bargués |
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| Přispěvatelé: | Ministerio de Economía y Competitividad (Espanya) |
| Rok vydání: | 2015 |
| Předmět: |
Pressure drop
Glass recycling Materials science Soil Science Ergun equation Grain size Regatge per degoteig law.invention Sphericity Glass microsphere Control and Systems Engineering law Filters and filtration Geotechnical engineering Composite material Trickle irrigation Porosity Agronomy and Crop Science Filtration Food Science Filtres i filtració |
| Zdroj: | © Biosystems Engineering, 2015, vol. 137, p. 55-63 Articles publicats (D-EQATA) DUGiDocs – Universitat de Girona instname |
| Popis: | 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 |
| Databáze: | OpenAIRE |
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