Experimental and numerical study of flow characteristics of flat-walled diffuser/nozzles for valveless piezoelectric micropumps

He, Xiuhua; Cai, Shengchuan; Deng, Zhaoqun; Yang, Songlan

doi:10.1177/0954406216631001

Cited by 11 publications

(6 citation statements)

References 45 publications

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“…It can be seen that the amplitude of the center point of the vibrator was positively correlated with the voltage, and these maximum amplitudes were 0.062 mm (40 V, 10 Hz), 0.095 mm (60 V, 10 Hz), 0.136 mm (80 V, 10 Hz), 0.217 mm (100 V, 11 Hz), and 0.228 mm (120 V, 10 Hz), as shown in Figure 11. In the low frequency region (1-25Hz), firstly, the amplitude of the piezoelectric vibrator increased with the increasing frequency (1-10 Hz), then, when the amplitude increased to a certain value, the amplitude decreased with the increasing frequency (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25), and was approximately zero after 25 Hz. In the high frequency region (>25 Hz), the amplitude decayed with increasing frequency and was accompanied by a few amplitude peak points.…”

Section: Resultsmentioning

confidence: 99%

Design and Experimental Verification of a PZT Pump with Streamlined Flow Tubes

et al. 2019

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In this paper, a streamlined flow tube valveless piezoelectric pump (SLFT PZT pump) is proposed to modify the single flow trend and improve the fluid flow stability. Firstly, the structural and working principle of the streamlined flow tube, which accounts for changing the flow trend and improving the flow stability, were analyzed. The flow resistance and flow rate equations were established. Secondly, the pressure and velocity fields of the tube were simulated. These simulated results were consistent with the theoretical results. Thirdly, the flow resistance of the flow tube was tested with pressure differences of 1000 Pa, 1200 Pa, 1400 Pa and 1600 Pa respectively. The trend of the result curves was consistent with the simulated results. The amplitude-frequency relationship and the flow-rate-frequency relationship were also tested, both result curves highly corelate. The maximum amplitude was 0.228 mm (10 Hz, 120 V), and the maximum flow rate was 17.01 mL/min (10 Hz, 100 V). Finally, the theoretical flow rate of the SLFT PZT pump was calculated at 100 V and 120 V. These results roughly fitted with the experimental results. The streamlined flow tube could change the internal flow trend that remarkably improved the flow stability. Therefore, it promoted the application of the valveless PZT pump in living cells, biomedical and polymer delivery.

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Section: Resultsmentioning

confidence: 99%

Design and Experimental Verification of a PZT Pump with Streamlined Flow Tubes

et al. 2019

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“…The main challenge of these applications is the actuation of the microliter-level liquids inside micro-sized tubes or channels (Laser and Santiago, 2004). It is possible to pump liquids in a micro-sized tube or channel with diverse actuation techniques like piezoelectric (He et al, 2017), peristaltic (Li and Chui, 2018), magnetic (Tang et al, 2018), pneumatic (Ahn et al, 2020), and electrostatic (Sounart et al, 2005). Among them, magnetic actuation has attracted the interest of researchers since it ensures a contactless manipulation (Tabak, 2020a) opportunity by employing magnetic nanofluids (Ando et al, 2011; Fan et al, 2020).…”

Section: Introductionmentioning

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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“…At present, piezoelectric actuators attract widespread attentions in designing jet dispensers, 1,2 injectors, 3 flow control valves, 4 digital on/off valves, 5 and micropumps 6 owing to their high energy density, simplicity in structure, fast dynamic response and nano-scale resolution. Among these precision fluid control scenarios, some efforts were focused on improving the dynamic bandwidth of flow control valves.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear coupled dynamic effects in flexure-amplified piezoelectric valve with an analytical transfer function

Ling

Wang

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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There have been a number of publications on designing flow control valves with piezoelectric actuators or their amplified alternatives for potential use in high-speed fluid control devices. However, less attention is focused on the coupled and nonlinear dynamic behaviors of piezo-hydraulic systems. In the present study, it is theoretically demonstrated that the hydraulic nonlinear and coupled dynamic behaviors have a large influence on the flow characteristic of flexure-amplified piezoelectric valve. To this end, the analytical transfer function of a typical two-stage flow control valve driven by mechanically amplified piezoelectric stacks is derived to capture its coupled and nonlinear dynamic characteristics. The modeling process involves a multi-domain dynamic issue with electro-mechanical dynamics of piezoelectric stacks, elasto-mechanical dynamics of compliant mechanisms and hydraulic dynamics. The structural parameters among piezoelectric stack, compliant amplifying mechanism and hydraulics are optimally matched based on the analytical transfer function. An optimum prototype is also fabricated and experimentally evaluated. The obtained results clearly show the key role of optimizing the coupled dynamic parameters in designing flexure-amplified piezoelectric flow control valves.

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Experimental and numerical study of flow characteristics of flat-walled diffuser/nozzles for valveless piezoelectric micropumps

Cited by 11 publications

References 45 publications

Design and Experimental Verification of a PZT Pump with Streamlined Flow Tubes

Design and Experimental Verification of a PZT Pump with Streamlined Flow Tubes

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

Nonlinear coupled dynamic effects in flexure-amplified piezoelectric valve with an analytical transfer function

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