Energy harvesting via ferrofluidic induction
Energy harvesting via ferrofluidic induction
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DOI：
10.1117/12.2178419
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
J. Monroe;E. S. Vasquez;Zachary Aspin;John D. Fairley;K. Walters;M. Berg;S. Thompson
中科院分区：
文献类型：
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作者：
J. Monroe;E. S. Vasquez;Zachary Aspin;John D. Fairley;K. Walters;M. Berg;S. Thompson
进行了一系列实验来研究和表征铁磁流体感应的概念，即通过螺线管通过铁磁流体（铁基纳米流体）的循环振荡来产生电力的过程。实验参数包括：偏置磁体的数量、磁体间距、螺线管芯、流体脉冲频率和铁磁流体颗粒直径。使用蠕动泵循环驱动两种水性铁磁流体，分别由 7-10 nm 氧化铁颗粒和市售羟基涂层磁珠 (~800 nm) 组成。溶液通过内径 3.2 毫米的 Tygon 管以 3、6 和 10 Hz 的频率脉动。将 1000 匝铜线螺线管放置在距离泵 45 厘米的管子周围。实验结果表明，铁磁流体在其循环通过期间能够在螺线管上感应出大约+/- 20 μV 的最大电势。随着脉动流频率的增加、铁纳米颗粒直径的增加或偏置磁体间距的减小，感应电压增加。螺线管磁芯材料的类型（铜或塑料）对感应没有明显影响。这些结果证明了铁磁流体感应的可行性，并深入了解其对流体/流动参数的依赖性。这种流体/磁耦合可用于多种应用的能量收集和/或转换系统设计。
A series of experiments were conducted to investigate and characterize the concept of ferrofluidic induction - a process for generating electrical power via cyclic oscillation of ferrofluid (iron-based nanofluid) through a solenoid. Experimental parameters include: number of bias magnets, magnet spacing, solenoid core, fluid pulse frequency and ferrofluid-particle diameter. A peristaltic pump was used to cyclically drive two aqueous ferrofluids, consisting of 7-10 nm iron-oxide particles and commercially-available hydroxyl-coated magnetic beads (~800 nm), respectively. The solutions were pulsated at 3, 6, and 10 Hz through 3.2 mm internal diameter Tygon tubing. A 1000 turn copper-wire solenoid was placed around the tube 45 cm away from the pump. The experimental results indicate that the ferrofluid is capable of inducing a maximum electric potential of approximately +/- 20 μV across the solenoid during its cyclic passage. As the frequency of the pulsating flow increased, the ferro-nanoparticle diameter increased, or the bias magnet separation decreased, the induced voltage increased. The type of solenoid core material (copper or plastic) did not have a discernible effect on induction. These results demonstrate the feasibility of ferrofluidic induction and provide insight into its dependence on fluid/flow parameters. Such fluidic/magneto-coupling can be exploited for energy harvesting and/or conversion system design for a variety of applications.