The analysis of internal transient flow and the performance of valveless piezoelectric micropumps with planar diffuser/nozzles elements

He, Xiuhua; Zhu, Jiawei; Zhang, Xitong; Xu, Liang; Yang, Songlan

doi:10.1007/s00542-015-2695-0

Cited by 24 publications

(14 citation statements)

References 30 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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“…Based on the results of membrane displacement experiments [10], the numerical simulations of the micropump with concave tuning were carried out as f = 100 Hz (see Fig. 9).…”

Section: Resultsmentioning

confidence: 99%

“…For example, Anders Olsson et al [8] reported that the flow separation in the diverging direction led to the low diffuser efficiency in steady flow. However, in transient flow, Sun et al [9] and He et al [10] concluded that the vortexes could contribute to the increase of pump efficiency, so the position and intensity of the vortexes play a significant role in transient flow.…”

Section: Introductionmentioning

confidence: 99%

Investigations on performance of valveless piezoelectric micropump with concave tuning diffuser/nozzle elements in transient flow

Shi

Yang

et al. 2019

Micro & Nano Letters

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A diffuser/nozzle is one of the most frequently-used channels in a valveless piezoelectric micropump, but its efficiency has not been satisfactory. Hence, optimisation of the channel structure is of great significance. The concave tuning diffuser/nozzle element can obtain steady flow rectification under different Reynolds numbers, and its efficiency is much higher than the conventional diffuser/nozzle element whose diverging angle is >25°. Therefore, the application of concave tuning on the micropump is promising and worth anticipating. In this work, the experiment and numerical simulation were carried out under the conditions of voltage (50-250 vpp), excitation frequency (10-1000 Hz) and Re c (100-1000). The results show that the performance of a micropump with concave tuning is better than that with a straight sidewall, as the pump efficiency is improved significantly. The position and size of vortexes are of great significance to the pump efficiency of the micropumps. The distribution of pressure in the micropumps with concave tuning and straight sidewall was displayed. With the increase of characteristic Reynolds number, the adverse pressure gradient occurred. Compared with the straight sidewall, the concave tuning structure can better withstand adverse pressure gradient and delay the boundary layer separation in the channel.

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“…The commonly used microfluidic non-mechanical actuation methods mainly include electroosmotic [15,16,17], magnetic [18,19], optical [20,21,22], thermal [23,24], and piezoelectric [25,26,27]. As a common microfluidic driving method, piezoelectric actuation has been widely used due to its low cost, easy operation, and high efficiency [28,29].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of a Microfluidic Pump Based on Combined Actuation of the Piezoelectric Effect and Liquid Crystal Backflow Effect

Guan

2019

Micromachines

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A novel combined actuation method based on the piezoelectric effect and liquid crystal backflow effect is proposed in this paper. The coupling mechanism of a piezoelectric transducer (PZT) and liquid crystal (LC) in a combined driving mode is analyzed, and the governing equations of electromechanical coupling based on inverse piezoelectric effect and the classical Leslie–Ericksen backflow equation are modified under combined driving method. The new multifield coupling dynamic equations for numerical analysis is established. Experimentally, a sandwiched micropump was manufactured and sealed with wet etching technology on a glass wafer. A testing platform was built to analyze the particles motion and the flow rates were measured with both single PZT or LC actuation and combined actuation. Comparing the results of the numerical analysis and experimental testing of the flow rate and LC molecule motion under different driving voltages and frequencies, the performance of the PZT/LC combined driving is found to be superior to that of the single driving mode (PZT or LC driving) under the same driving conditions. Moreover, the new combined driving mode overcome the disadvantages of single driving mode and enhance the driving efficiency significantly. The simulation results are in good agreement with the experimental data. The maximum flow rate of the micropump achieved was 4.494 μL/min with combined driving method.

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The analysis of internal transient flow and the performance of valveless piezoelectric micropumps with planar diffuser/nozzles elements

Cited by 24 publications

References 30 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

Investigations on performance of valveless piezoelectric micropump with concave tuning diffuser/nozzle elements in transient flow

Performance Analysis of a Microfluidic Pump Based on Combined Actuation of the Piezoelectric Effect and Liquid Crystal Backflow Effect

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