Experimental study of porous media flow using hydro-gel beads and LED based PIV
Experimental study of porous media flow using hydro-gel beads and LED based PIV
复制标题
使用水凝胶珠和基于 LED 的 PIV 进行多孔介质流动的实验研究
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
H. Muhlhaus
中科院分区：
文献类型：
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作者：
H. M. D. Harshani;S. Galindo‐Torres;A. Scheuermann;H. Muhlhaus
提出了一种使用球形水凝胶珠和粒子图像测速（PIV）技术测量多孔流动特性的新颖实验方法。由高吸水性聚合物制成的水凝胶珠组成的透明多孔介质允许使用水作为流体相，同时具有相同的折射率。因此，创建了一种适应性更强、成本效益更高的折射率匹配 (RIM) 介质。多孔介质的透明性质允许光学系统通过使用聚酰胺种子颗粒（PSP）来可视化流场。使用基于低风险发光二极管 (LED) 的光来照亮平面，以跟踪播种颗粒的路径，从而表征多孔介质内的流动。使用流量计手动测量的流量来校准系统。获得速度分布并进行定性和定量分析，以表征流动。结果表明，这种适应性强、低风险的实验装置可用于低雷诺数下多孔介质的流量测量。还讨论了使用水凝胶珠的局限性。
A novel experimental approach for measuring porous flow characteristics using spherical hydro-gel beads and particle image velocimetry (PIV) technique is presented. A transparent porous medium consisting of hydro-gel beads that are made of a super-absorbent polymer, allows using water as the fluid phase while simultaneously having the same refractive index. As a result, a more adaptable and cost effective refractive index matched (RIM) medium is created. The transparent nature of the porous medium allows optical systems to visualize the flow field by using poly-amide seeding particles (PSP). Low risk light emitting diode (LED) based light was used to illuminate the plane in order to track the seeding particles’ path for the characterization of the flow inside the porous medium. The system was calibrated using a manually measured flow by a flow meter. Velocity profiles were obtained and analysed qualitatively and quantitatively in order to characterise the flow. Results show that this adaptable, low risk experimental set-up can be used for flow measurements in porous medium under low Reynolds numbers. The limitations of using hydro-gel beads are also discussed.