CFD and digital particle tracking to assess flow characteristics in the labyrinth flow path of a drip irrigation emitter

Li, Yunkai; Yang, Peiling; Xu, Tianhua; Ren, Shumei; Lin, Xin; Wei, Runjie; Xu, He-Yong

doi:10.1007/s00271-008-0108-1

Cited by 64 publications

(48 citation statements)

References 6 publications

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“…The flow of fluid in the drip irrigation tube (tape) was laminar flow, the sheer stress of which was low, so it was easy for the growth of biofilms, instead of detachment. The water flow in labyrinth path was turbulence (Li et al 2008), the sheer stress of which was high, and it was difficult for the growth of biofilms, but for detachment. The inlet and outlet of emitters, where the sheer stresses were low, were the areas easy for the growth of biofilms.…”

Section: Discussionmentioning

confidence: 99%

“…Emitter clogging has become the major problem limiting more widespread use of drip irrigation, because it can reduce the service life and benefits of a drip irrigation system. Since the first drip irrigation conference was held in Israel (Goldberg 1976), a large number of researchers have attempted to solve the problem from many aspects (Adin and Sacks 1991;Ravina et al 1992Ravina et al , 1997Capra and Scicolone 2004;Taylor et al 1995;Liu and Huang 2009;Li et al 2008), such as, rational filtration equipment, periodic acidification and chlorination treatment, and optimal design of labyrinth path of drip irrigation emitters. But the mechanisms and regulation patterns of the emitters clogging are still not clear.…”

Section: Introductionmentioning

confidence: 99%

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Surface topographic characteristics of suspended particulates in reclaimed wastewater and effects on clogging in labyrinth drip irrigation emitters

Liu

et al. 2011

Irrig Sci

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Drip irrigation is the most effective and reliable method for reclaimed wastewater irrigation. Emitter clogging is the major problem for extending the drip irrigation technology. The existence of suspended particulates in irrigation water is the main reason for the emitter clogging. However, the reclaimed wastewater quality is extremely complex, and there is a series of physical, chemical, and biological reactions between suspended particulates and other materials contained such as microorganisms, which make the characteristics of suspended particulates in reclaimed wastewater complicated. In this paper, two types of widely used wastewaters treated with fluidized-bed reactor (FBR) and biological aerated filter (BAF) processes respectively were selected. The scanning electron microscope (SEM) technology and fractal theory were used to quantitatively describe the characteristics of the surface topography of suspended particulates. The results showed that the suspended particulates in two reclaimed wastewater were flocculent and porous. The pore system mainly consisted of solid suspended particulates, and most areas between the particulates were filled with microbes and extracellular polymers (EPS). The complex structure of biofilms was formed. That the biofilms grew and detached in irrigation system and deposited continuously at the inlet and outlet of labyrinth path was the major reason for the emitter clogging. The surface topography of suspended particulates in both reclaimed wastewaters showed fractal and multifractal characteristics, and the fractal dimension could not characterize the local and microsingularity of particulates but multifractal dimension could. The uniformity of the distribution of sediment pores increased with the size. Comparatively, the uniformity of suspended particulates in reclaimed wastewater treated by FBR was lower. With operation of reclaimed wastewater irrigation system, the average discharge of emitters decreased continuously with obvious fluctuations. The clogging degree of emitters was low during the first 256 h, and the clogging degree of the two types of reclaimed water was similar. But then, the degree of clogging increased greatly, and the FBR treatment on the emitters discharge were more obvious than BAF. It was closely related to the growth, detachments and sediment of biofilms in the irrigation system. Hence, using the reclaimed wastewater treated by BAF for drip irrigation is more suitable.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface topographic characteristics of suspended particulates in reclaimed wastewater and effects on clogging in labyrinth drip irrigation emitters

Liu

et al. 2011

Irrig Sci

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“…Nestas regiões é propício o surgimento de depósitos com pequenas partículas e consequentemente a formação e aderência de biofilme. A eliminação dessas regiões proporciona melhor capacidade de autolimpeza (Li et al, 2008).…”

Section: Resultsunclassified

Tempo Estimado Para Aplicação De Processos De Desobstrução Em Gotejadores Com Uso De Esgoto Tratado

Szekut¹,

Azevedo²,

Santos³

et al. 2017

Anais Do IV Inovagri International Meeting - 2017

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RESUMO:Um dos problemas da irrigação localizada é a obstrução das tubulações e emissores decorrente da aplicação de água com qualidade inferior. Para a prevenção ou remediação desse problema, além da manutenção periódica, utiliza-se processos de desobstrução. Neste contexto, objetivou-se identificar nesta pesquisa o tempo de funcionamento para a aplicação de processos de desobstrução em sistemas de irrigação por gotejamento sendo submetidos ao uso de água residuária de esgoto doméstico. Foram utilizados três modelos de tubos com gotejadores in line do tipo labirinto submetidos a 1188 h de funcionamento. Para que mantenha boas condições de desempenho hidráulico deve-se aplicar algum produto ou processo de desobstrução com 404, 175 e 147 h de funcionamento, respectivamente, para M1, M2 e M3. A condição de fluxo interna de cada emissor e a qualidade de água aplicada determinam tempos diferentes para a aplicação. PALAVRAS-CHAVE: Obstrução de gotejadores, biofilme, uniformidade de aplicação TIME REQUIRED FOR APPLICATION FOR CLEARING PROCESS IN DRIP IRRIGATION SYSTEMS ABSTRACT:One of the problems of localized irrigation is clogging the pipes and emitters resulting from the application of water with inferior quality. For the prevention or remedy this problem, in addition to regular maintenance, it is used unblocking procedures. In this context, the objective was to identify the operating time for the application of a clearing process in a drip irrigation system with wastewater use of domestic sewage. Three models of pipes with in-

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“…Essas regiões apresentam características distintas em relação à sensibilidade para deposição de partículas (LI et al, 2008; AL-MUHAMMAD; TOMAS; ANSELMET, 2016;ZHANG et al, 2010). A deposição de partículas no interior dos labirintos pode causar alterações no desempenho dos gotejadores, podendo provocar obstrução ou aumento da vazão dos emissores (OLIVEIRA et al, 2017).…”

Section: Introductionunclassified

Análise da deposição de partículas de argila em um sistema minifluidico de escoamento

Talamini¹,

Oliveira²,

Frizzone³

et al. 2017

Anais Do IV Inovagri International Meeting - 2017

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CFD and digital particle tracking to assess flow characteristics in the labyrinth flow path of a drip irrigation emitter

Cited by 64 publications

References 6 publications

Surface topographic characteristics of suspended particulates in reclaimed wastewater and effects on clogging in labyrinth drip irrigation emitters

Surface topographic characteristics of suspended particulates in reclaimed wastewater and effects on clogging in labyrinth drip irrigation emitters

Tempo Estimado Para Aplicação De Processos De Desobstrução Em Gotejadores Com Uso De Esgoto Tratado

Análise da deposição de partículas de argila em um sistema minifluidico de escoamento

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