Direct observation of closed-loop ferrohydrodynamic pumping under traveling magnetic fields
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Mao-2011-Direct observation of closed-loop.pdf
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Author(s)
Mao, Leidong
Elborai, Shihab
He, Xiaowei
Zahn, Markus
Koser, Hur
Date Issued
September 2011
Journal
Physical Review B
Publisher
American Physical Society (APS)
Citation
Mao, Leidong et al. “Direct observation of closed-loop ferrohydrodynamic pumping under traveling magnetic fields.” Physical Review B 84.10 (2011): n. pag. Web. 26 Jan. 2012.
Version
Final published version
Abstract
Ferrofluid-based liquid manipulation schemes typically actuate an immiscible liquid via a ferrofluid plug, using high magnetic flux (∼1 T) densities and strong field gradients created with bulky permanent magnets. They rely on surface tension effects to maintain the cohesion of the ferrofluid plug, necessitating miniature channels and slow (∼1 μl/min) flow speeds. Here, we demonstrate direct ferrohydrodynamic pumping using traveling magnetic fields at controllable speeds in a simple, closed-loop geometry without any mechanically actuated components. The pumping approach is compact, scalable, and practical. Using moderate field amplitudes (∼10 mT), we obtained a maximum volumetric flow rate of 0.69 ml/s using a readily available commercial ferrofluid. Our closed-loop pumping approach could lead to integrated and efficient liquid manipulation and cooling schemes based on ferrofluids.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.84.104431
