Influence of Dentation Angle of Labyrinth Channel of Drip Emitters on Hydraulic and Anti-Clogging Performance

2018 ◽  
Vol 68 (2) ◽  
pp. 256-267 ◽  
Author(s):  
Liming Yu ◽  
Na Li ◽  
Xiaogang Liu ◽  
Qiliang Yang ◽  
Zhangyan Li ◽  
...  
Keyword(s):  
Labyrinth Channel

Numerical investigation of the clogging mechanism in labyrinth channel of the emitter

2007 ◽  
Vol 70 (13) ◽  
pp. 1598-1612 ◽  
Author(s):  
Zhang Jun ◽  
Zhao Wanhua ◽  
Tang Yiping ◽  
Wei Zhengying ◽  
Lu Bingheng
Keyword(s):  
Numerical Investigation ◽  
Labyrinth Channel

scholarly journals Numerical simulation of flow in trapezoidal labyrinth-channels of drip irrigation

2021 ◽  
Vol 49 (1) ◽  
pp. 147-153
Author(s):  
Hamza Ouarriche ◽  
Bouhali El ◽  
Firdaouss Bouisfi ◽  
Mohamed Chaoui ◽  
Mohamed Hannaoui
Keyword(s):  
Fluid Dynamics ◽  
Drip Irrigation ◽  
Maximum Velocity ◽  
Suspended Particles ◽  
Phase Flow ◽  
Streamline Flow ◽  
Two Phase ◽  
Labyrinth Channel ◽  
The Mean ◽  
Pass Through

The clogging of emitters has been considered as one of the most troublesome problems inhibiting the extension of drip irrigation. This paper investigates the flow field of water and behaviour of suspended particles in the trapezoidal labyrinth-channel. Computational Fluid Dynamics methods has been executed on liquid-solid two-phase flow in labyrinth-channel emitters. RNG k-e turbulence model was used to evaluate four types of emitters that have the same characteristics and differ in the elbow width S. This study has shown that as the value of S increases, the maximum velocity in the labyrinth-channel decreases and the number of vortices increases. However, emitter with a high S value are more subtle to clogging. In addition, it was also observed that smaller diameter particles behave best when they pass through the channel and follow the streamline flow. As the particle diameters become larger, the particles tend to leave the mean stream and enter the vortex zones under the force of inertia. So, more suspended particles trapped in the vortex area , more the chances of emitter clogging increase. All of these furthermore confirm that vortex and low speed regions were the main causes leading to emitter clogging.

scholarly journals Effect of chlorination and pressure flushing of drippers fed by reclaimed wastewater on biofouling

2020 ◽  
Author(s):  
Kévin Lequette ◽  
Nassim Ait-Mouheb ◽  
Nicolas Adam ◽  
Marine Muffat-Jeandet ◽  
Valérie Bru-Adan ◽  
...  
Keyword(s):  
Drip Irrigation ◽  
Water Distribution ◽  
Irrigation System ◽  
Resistant Bacteria ◽  
List Type ◽  
Reclaimed Wastewater ◽  
Microbial Composition ◽  
Labyrinth Channel ◽  
Biofilm Development ◽  
The Impact

AbstractDripper clogging reduces the performance and service life of a drip irrigation system. The impact of chlorination (1.5 ppm of free chlorine during 1 h application) and pressure flushing (0.18 MPa) on the biofouling of non-pressure-compensating drippers fed by real reclaimed wastewater was studied at lab scale using Optical Coherence Tomography. The effect of these treatments on microbial composition (bacteria and eukaryotes) was also investigated by High-throughput DNA sequencing. Biofouling was mainly observed in inlet, outlet and return areas of the drippers. Chlorination limited biofilm development mainly in the mainstream of the milli-labyrinth channel. It was more efficient when combined with pressure flushing. Moreover, chlorination was more efficient in maintaining the water distribution uniformity. It reduced the bacterial concentration and the diversity of the dripper biofilms compared to the pressure flushing method. This method strongly modified the microbial communities, promoting chlorine-resistant bacteria such as Comamonadaceae or Azospira. Inversely, several bacterial groups were identified as sensitive to chlorination such as Chloroflexi and Planctomycetes. Nevertheless, one month after stopping the treatments the bacterial diversity re-increased and the chlorine-sensitive bacteria such as Chloroflexi phylum and the Saprospiraceae, Spirochaetaceae, Christensenellaceae and Hydrogenophilaceae families re-emerged with the growth of biofouling, highlighting the resilience of the bacteria from drippers. Based on PCoA analyses, the structure of the communities still clustered separately from never-chlorinated drippers, showing that the effect of chlorination was still present one month after stopping the treatment.HighlightsThe fouling of drippers is a bottleneck for drip irrigation using reclaimed wastewaterBiofouling was lowest when chlorination was combined with pressure flushingThe β-Proteobacteria and Firmicutes contain chlorine resistant bacteriaThe decrease of Chloroflexi by chlorination was transitoryThe bacterial community was resilient after the interruption of cleaning events

Micro-PIV characterization of the flow in a milli-labyrinth-channel used in drip irrigation

2018 ◽  
Vol 59 (12) ◽  
Author(s):  
Jafar Al-Muhammad ◽  
Séverine Tomas ◽  
Nassim Ait-Mouheb ◽  
Muriel Amielh ◽  
Fabien Anselmet
Keyword(s):  
Drip Irrigation ◽  
Micro Piv ◽  
Labyrinth Channel

Influence of Flushing Pressure before Irrigation on the Anti-Clogging Performance of Labyrinth Channel Emitters

2017 ◽  
Vol 67 (2) ◽  
pp. 191-198 ◽  
Author(s):  
Liming Yu ◽  
Na Li ◽  
Qiliang Yang ◽  
Xiaogang Liu
Keyword(s):  
Labyrinth Channel

scholarly journals Impact of hydrodynamics on clay particle deposition and biofilm development in a labyrinth-channel dripper

2018 ◽  
Vol 37 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Nassim Ait-Mouheb ◽  
Juliette Schillings ◽  
Jafar Al-Muhammad ◽  
Ryad Bendoula ◽  
Séverine Tomas ◽  
...  
Keyword(s):  
Particle Deposition ◽  
Clay Particle ◽  
Labyrinth Channel ◽  
Biofilm Development

scholarly journals The mechanism of emitter clogging analyzed by CFD–DEM simulation and PTV experiment

2018 ◽  
Vol 10 (1) ◽  
pp. 168781401774302 ◽  
Author(s):  
Liming Yu ◽  
Na Li ◽  
Jun Long ◽  
Xiaogang Liu ◽  
Qiliang Yang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Discrete Element Method ◽  
Single Particle ◽  
Phase Particle ◽  
Discrete Element ◽  
Main Stream ◽  
Total Force ◽  
Labyrinth Channel ◽  
Element Method

Small but complicated labyrinth channel emitters are easily clogged. In this study, computational fluid dynamics–discrete element method coupling approach was employed to investigate the mechanism of emitter clogging caused by particles in size of 65, 100, and 150 µm. Computational fluid dynamics used Navier–Stokes equation to analyze flow characteristics of continuous phase. Discrete element method used Newton’s laws of motion to measure single particle motion and group distribution of disperse phase. Particle tracking velocimetry was also utilized to follow the trajectories and velocity of single particle. Our results indicated that the smaller the particle size, the less the total force. Tiny sands were mainly influenced by drag forces. The amplitude between tooth tips was small. Particles moved basically in the main stream with fast velocity and short travel distance, thereby having good following performance. It took shorter time to reach micro-dynamic balance. Meanwhile, the amount of sediments in the labyrinth channel was less. Particles in size of 150 µm were mainly affected by inertial forces. They can easily enter vortex areas. Sands staying longer than 0.1 s in the labyrinth channel accounted for 37.9% of total number. Sand groups were mainly distributed at the inlet of labyrinth channel. The more sands trapped in vortex areas, the easier it was to precipitate and cause emitter clogging.

Structural optimization of labyrinth-channel emitters based on hydraulic and anti-clogging performances

2010 ◽  
Vol 29 (5) ◽  
pp. 351-357 ◽  
Author(s):  
Jun Zhang ◽  
Wanhua Zhao ◽  
Yiping Tang ◽  
Bingheng Lu
Keyword(s):  
Structural Optimization ◽  
Labyrinth Channel
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