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Experimental and numerical characterization of the vortex zones along a labyrinth milli-channel used in drip irrigation
International Journal of Heat and Fluid Flow ( IF 2.6 ) Pub Date : 2019-12-01 , DOI: 10.1016/j.ijheatfluidflow.2019.108500
Jafar Al-Muhammad , Séverine Tomas , Nassim Ait-Mouheb , Muriel Amielh , Fabien Anselmet

The labyrinth-channel is largely used in dripper systems. The baffles play an important role to generate the head losses and induce the flow regulation on the drip irrigation network. But they also develop vorticity regions where the velocity is low or zero. These vorticity regions promote the deposition of particles or other biochemical development causing dripper clogging. The flow in the dripper labyrinth-channel must be described to analyze dripper clogging sensibility which drastically reduces its performance. This characterization is performed experimentally using the micro-particle-image-velocimetry (Micro-PIV) method, and numerically using the RSM Simulation. In this study, Micro-PIV experiments allow to analyze the flow in ten-pattern repeating baffles which reproduce the micro-irrigation dripper. The cross section is equal to 1 mm 2 and the inlet Reynolds number varies from 345 to 690. The present study first introduces a global analysis of the flow through the mean velocity modulus, the Reynolds stresses u , 2 v 2 and u v and the turbulence Reynolds number. Then, results for the mean strain rate and the mean spanwise vorticity are presented and discussed. Next, advanced methods of vortex detection are introduced and analyzed to better distinguish the vortex zones and to determine the vortex sizes. Furthermore, the numerical model is used to validate and analyze in a more detailed way the experimental results obtained by Micro-PIV.

中文翻译:

用于滴灌的迷宫式毫通道涡流区的实验和数值表征

迷宫式通道主要用于滴头系统。挡板在产生水头损失和诱导滴灌网络流量调节方面起着重要作用。但它们也会形成速度低或为零的涡度区域。这些涡流区域促进颗粒沉积或其他生化发展,导致滴头堵塞。必须描述滴头迷宫通道中的流动,以分析滴头堵塞敏感性,这会大大降低其性能。这种表征使用微粒图像测速 (Micro-PIV) 方法进行实验,并使用 RSM 模拟进行数值模拟。在这项研究中,微 PIV 实验允许分析重现微灌溉滴头的十模式重复挡板中的流动。横截面等于 1 mm 2 并且入口雷诺数从 345 到 690 不等。本研究首先介绍了通过平均速度模量、雷诺应力 u 、2 v 2 和 uv 以及湍流的整体分析雷诺数。然后,给出并讨论了平均应变率和平均展向涡度的结果。接下来,介绍和分析涡流检测的先进方法,以更好地区分涡流区域并确定涡流大小。此外,该数值模型用于更详细地验证和分析 Micro-PIV 获得的实验结果。2 v 2 和 uv 以及湍流雷诺数。然后,给出并讨论了平均应变率和平均展向涡度的结果。接下来,介绍和分析涡流检测的先进方法,以更好地区分涡流区域并确定涡流大小。此外,该数值模型用于更详细地验证和分析 Micro-PIV 获得的实验结果。2 v 2 和 uv 以及湍流雷诺数。然后,提出并讨论了平均应变率和平均展向涡度的结果。接下来,介绍和分析涡流检测的先进方法,以更好地区分涡流区域并确定涡流大小。此外,该数值模型用于更详细地验证和分析 Micro-PIV 获得的实验结果。
更新日期:2019-12-01
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