Design and fabrication of a magnetic fluid micropump for applications in direct methanol fuel cells

Lee, Shi‐Min; Kuan, Yean‐Der; Sung, Min-Feng

doi:10.1016/j.jpowsour.2011.04.060

Cited by 15 publications

(7 citation statements)

References 11 publications

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“…Further increasing the actuator speed beyond 15 rpm reduces the fluid velocity. Similar inversion points were also reported in the previous works of [39,42,43,66] for different actuator designs. During the actuation, there are two main effects on the magnetic nanofluid.…”

Section: Resultssupporting

confidence: 89%

“…%) inside the primary channel, and the movement of the magnetic nanofluid plug causes a deflection on the membrane, which drives a secondary fluid inside the adjacent channel. A similar concept was also studied by Lee et al [39] to drive the fuel in direct methanol fuel cells. Studies that are summarized above reveal that magnetic actuation occurs by changing the position of the magnets during the operation.…”

Section: Introductionmentioning

confidence: 85%

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A rotating permanent magnetic actuator for micropumping devices with magnetic nanofluids

Doğanay

Çetín

Ezan

et al. 2020

J. Micromech. Microeng.

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In this study, a novel rotating permanent magnetic actuator (PMA) system is proposed to manipulate magnetic nanofluids to pump chemicals inside micro-sized channels with circular paths. The PMA consists of two permanent magnet pairs and a rotor-like structure. A semicircular-shaped microchannel with a square cross-section area is located at the top of the actuator in order to investigate the performance of the PMA. Fe3O4-water magnetic nanofluid is employed as a working fluid for the manipulation inside the microchannel. In the first stage of this work, a numerical survey is conducted to determine the most suitable angular distance between permanent magnets of a pair in terms of generated magnetic field form in the microchannel region and velocity distribution of magnetic nanofluid within the semicircular microchannel when the permanent magnets are stationary. Preliminary experiments are then carried out for the stationary permanent magnets to validate the predicted flow-field results. Performance tests for different PMA speeds (7.5–30 rpm) and particle concentrations (1%–3% by vol.) indicate that it is possible to manipulate the magnetic nanofluid inside the semicircular channel within a velocity range of 58.7–940 µm s−1, which corresponds to a flow rate range of 0.56–9.02 µL min−1. The results confirm that the proposed PMA system provides flow rate requirements in analytical microfluidic applications such as low flow drug delivery (1–10 µL min−1), cell sorting (6.1 µL min−1), and pathogen detection (3–5.83 µL min−1).

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 85%

A rotating permanent magnetic actuator for micropumping devices with magnetic nanofluids

Doğanay

Çetín

Ezan

et al. 2020

J. Micromech. Microeng.

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“…Several reciprocating micropumps are presented using ferrofluid as a piston actuator [29,30] or employing ferrofluid plugs in both pumping and valving functions [31][32][33]. Some innovative concepts for ferrofluidic rotary displacement pumps have also been proposed and investigated to provide continuous pumping [34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental studies of a magnetically actuated valveless micropump

Ashouri

Shafii

Moosavi

2016

J. Micromech. Microeng.

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This paper presents the prototype design, fabrication, and characterization of a magnetically actuated micropump. The pump body consists of three nozzle/diffuser elements and two pumping chambers connected to the ends of a flat-wall pumping cylinder. A cylindrical permanent magnet placed inside the pumping cylinder acts as a piston which reciprocates by using an external magnetic actuator driven by a motor. The magnetic piston is covered by a ferrofluid to provide self-sealing capability. A prototype composed of three bonded layers of polymethyl-methacrylate (PMMA) has been fabricated. Water has been successfully pumped at pressures of up to 750 Pa and flow rates of up to 700 µl min−1 while working at the piston actuation frequency of 4 and 5 Hz, respectively. 3D numerical simulations are also carried out to study the performance of the pump. The best experimental and numerical volumetric efficiency of the pump are about 7 and 8%, respectively, at the piston speed of 0.03 m s−1. The contactless external actuation feature of the design enables integration of the pump with other PMMA-based microfluidic systems with low cost and disposability.

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“…The general actuation mechanisms of reciprocating micropumps include piezoelectric [4, 5], electrostatic [6], electromagnetic [7], thermo‐pneumatic [8] and shape memory alloy (SMA) actuation [9] and so on. Compared with other actuations, piezoelectric actuation has many merits such as large actuation force, fast response time, good reliability, a simple structure, is miniature and of light weight.…”

Section: Introductionmentioning

confidence: 99%

Vibration performances of polymeric micropump actuated by PbZrTiO ₃ bimorph

Luo

Yin

Wang

et al. 2013

Micro & Nano Letters

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The check valve micropump can easily reach a high-flow rate, and it has promising application prospects in microfluidic devices and artificial organs. There are several vibrating parts in the check valve pump, including the actuator, membrane and valves. The vibration performances of these parts have a coupling influence on the performance of the micropump. In the work reported in this Letter, four kinds of micropumps with different valves and actuators were designed and fabricated, and the vibration performances of the vibrating parts were analysed by the finite element method. Then, the performances of each kind of micropump were studied by frequency sweeping experiments. The factors affecting micropump performance were determined, and the experimental results approximately coincide with the theoretical analysis. This research provides a theoretical and experimental basis for the design and optimisation of the micropump. Introduction:The micropump, as an actuator for microfluid transmission and control, has been widely used in drug delivery, biological and chemical analysis and microelectronics cooling [1,2]. The reciprocating micropump is the most extensively studied micropump, and it can basically be divided into two types: the check valve micropump and the valveless micropump. The valveless micropump is hard to enlarge and it is difficult to precisely control the flow rate because of its inherent issues such as back flow and random flow. However, the micropump with valves can reach a high-flow rate and also can realise linear control. In addition, it has mature manufacturing technology [2,3].The general actuation mechanisms of reciprocating micropumps include piezoelectric [4,5], electrostatic [6], electromagnetic [7], thermo-pneumatic [8] and shape memory alloy (SMA) actuation [9] and so on. Compared with other actuations, piezoelectric actuation has many merits such as large actuation force, fast response time, good reliability, a simple structure, is miniature and of light weight. Therefore piezoelectric actuation is the most commonly used drive mode, and the piezoelectric micropump has promising application prospects.The performance of the micropump actuated by PbZrTiO 3 (PZT) is affected by many factors. The previous studied mainly focused on static factors such as voltage, valve thickness, channel shape, membrane thickness and so on. Several researches have studied the influence of the actuator on the performance of the micropump, however most of them were for valveless micropumps [10][11][12]. Among the few researches of micropumps with valves, the influences of these components were separately analysed [13], or the valves were assumed to be working perfectly so ignored for analysis [14].In the micropump, there are several vibrating parts including the PZT actuator, membrane and valves. The vibration performances of the vibrating parts have a coupling influence on micropump performance, but few researches of this aspect have been reported. Hence, it is necessary to perform a comprehensive analysis to ...

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Design and fabrication of a magnetic fluid micropump for applications in direct methanol fuel cells

Cited by 15 publications

References 11 publications

A rotating permanent magnetic actuator for micropumping devices with magnetic nanofluids

A rotating permanent magnetic actuator for micropumping devices with magnetic nanofluids

Theoretical and experimental studies of a magnetically actuated valveless micropump

Vibration performances of polymeric micropump actuated by PbZrTiO ₃ bimorph

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Design and fabrication of a magnetic fluid micropump for applications in direct methanol fuel cells

Cited by 15 publications

References 11 publications

A rotating permanent magnetic actuator for micropumping devices with magnetic nanofluids

A rotating permanent magnetic actuator for micropumping devices with magnetic nanofluids

Theoretical and experimental studies of a magnetically actuated valveless micropump

Vibration performances of polymeric micropump actuated by PbZrTiO 3 bimorph

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Product

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Vibration performances of polymeric micropump actuated by PbZrTiO ₃ bimorph