A rotary ferrofluidic vane micropump with C shape baffle

Liu, Bendong; Zhang, Zhen; Yang, Jiechao; Yang, Jiahui; Li, Desheng

doi:10.1016/j.snb.2018.02.113

Cited by 23 publications

(7 citation statements)

References 24 publications

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“…Moreover, the max flow rates observed were very close to each other for all cases. Liu et al [43] proposed a novel C-shaped baffle-based ferrofluidic micropump in order to manipulate an immiscible secondary fluid. They used a commercial magnetic nanofluid in a square microchannel with a width of 600 µm, and varied the actuation speed from 10 rpm to 20 rpm.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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 the proposed concept by Dog˘anay et al (2020), the geometrical parameters of the PMA were determined concerning the radius of the semicircular channel. In micropumping applications, it is possible to use magnetic nanofluid either to manipulate a secondary immiscible liquid (Liu et al, 2018a) or to manipulate itself directly (Kurtoglu et al, 2012). The proposed actuation concept enables both.…”

Section: Definition Of the Problemmentioning

confidence: 99%

Constant flow rate micropumping using closed-loop control of magnetically actuated nanofluid

Doğanay

Çetín

Ezan

et al. 2023

Transactions of the Institute of Measurement and Control

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In this study, a magnetic actuator is controlled to obtain a constant flow rate micropumping by a magnetic nanofluid flow inside a semicircular-shaped microchannel with a constant square cross-section. A closed-loop control strategy is developed to achieve adequate control by utilizing a model based on experimental data. A novel digital image processing–based real-time velocity estimation algorithm is proposed as feedback information in the closed-loop control system. This paper aims to evaluate the success of the proposed real-time velocity estimation algorithm. The results indicate that the proposed algorithm can supply the fluid velocity inside the microchannel with a maximum deviation of less than 4% in the current micropumping system. Three different controllers—that is, proportional (P), proportional–integral (PI), and proportional–integral–derivative (PID)—are also implemented to test the influence of the control logic used in the closed-loop control strategy. Compared with the previous study, the implementation of a closed-loop control strategy in the present work provided a constant flow rate pumping. The findings reveal that the PID controller can maintain a constant flow rate with transient time values around 186, 94, and 60 seconds for reference values of 100, 200, and 300 µm/s, respectively. In addition, the PID controller could supply a constant flow rate within the microchannel 51% longer than the PI controller.

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“…782 The magnetocaloric effect controls the position or movement of tiny volumes of ferrofluid to fulfill the role of a plug, a valve or a piston. Ferrofluidic micropumps have characteristic sizes from several mm to a few tens of mm and flow rate of the order of several tens of microliter per min and can ensure a backpressure of about 1000 Pa, 784 with promising applications in micro fluid handling, such as for polymerase chain reaction (PCR), 785 lab-on-a-chip, micro total analysis and drug delivery systems. 780,786,787 In the case of micro-scale gear pumps, the extremely low efficiency is due to volumetric loss which can be reduced almost completely (approx.…”

Section: Actuatorsmentioning

confidence: 99%