Effect of the Dynamic Cone Angle on the Atomization Performance of a Piezoceramic Vibrating Mesh Atomizer

Yan, Qiufeng; Chen, Wu; Zhang, Jianhui

doi:10.3390/app9091836

Cited by 19 publications

(12 citation statements)

References 45 publications

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“…The pressure loss coefficient is a dimensionless number to characterize the pressure loss in a hydraulic system, which involves pressure loss by friction and by changes in the aperture geometry. In our case, the micro-apertures have a half angle of 35 • , which, from the tables reported by Q. Yan et al [27], give a loss factor of ξ Dd = 0.62 and ξ Dn = 0.49 when the cone acts as diffuser and as the nozzle, respectively. An equation for the net volume flow rate when the throat of the tapered aperture is exposed to the air and the flared side is in contact with the liquid was also reported by Q. Yan et al [27].…”

Section: Model Of Atomization Volume Flowsupporting

confidence: 60%

“…In our case, the micro-apertures have a half angle of 35 • , which, from the tables reported by Q. Yan et al [27], give a loss factor of ξ Dd = 0.62 and ξ Dn = 0.49 when the cone acts as diffuser and as the nozzle, respectively. An equation for the net volume flow rate when the throat of the tapered aperture is exposed to the air and the flared side is in contact with the liquid was also reported by Q. Yan et al [27]. The equation involves the change in volume of the apertures and the change in volume of the liquid chamber, where n is the number of apertures, and f is the vibration frequency of the PZT.…”

Section: Model Of Atomization Volume Flowsupporting

confidence: 60%

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Vibration Analysis of a Piezoelectric Ultrasonic Atomizer to Control Atomization Rate

et al. 2021

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In this work, a mechanical vibrational analysis of an ultrasonic atomizer is carried out to control its atomization mass transfer rate. An ultrasonic atomizer is a device constructed with a piezoelectric ring coupled to a metallic circular thin plate with micro-apertures. The mechanism of mass transfer by atomization is a complex phenomenon to model because of the coupling effect between the fluid transfer and dynamic mechanics controlled by a piezoelectric vibrating ring element. Here, the effect of the micro-apertures shape of the meshed thin plate coupled to a piezoelectric ring during vibration, as well as the resonance frequency modes, are numerically studied using a finite element analysis and compared with theoretical and experimental results. Good correlations between the predicted and experimental results of the resonant frequencies and atomization rates were found.

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Section: Model Of Atomization Volume Flowsupporting

confidence: 60%

Section: Model Of Atomization Volume Flowsupporting

confidence: 60%

Vibration Analysis of a Piezoelectric Ultrasonic Atomizer to Control Atomization Rate

et al. 2021

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“…The shapes of the cross-section are also expected to affect the atomization rate, since holes are concentrated near the center of the disc. Higher displacement at the center will facilitate higher atomization rate (Yan et al, 2019). The next two highest peaks were at much lower frequencies between 20 and 30 kHz.…”

Section: Vibration Modesmentioning

confidence: 95%

Atomization Control to Improve Soft Actuation Through Vaporization

et al. 2021

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Soft actuation through droplet evaporation has significantly improved the actuation speed of methods that utilize liquid vaporization. Instead of boiling bulk liquid, this method implements atomization to disperse small droplets into a heater. Due to the large surface area of the droplets, the liquid evaporates much faster even at small temperature changes. However, further analysis is required to maximize the performance of this complex multi-physics method. This study was conducted to provide further insight into the atomizer and how it affects actuation. Numerical simulations were used to inspect the vibration modes and determine how frequency and voltage affect the atomization process. These results were used to experimentally control the atomizer, and the droplet growth on the heater surface was analyzed to study the evaporation process. A cuboid structure was inflated with the actuator to demonstrate its performance. The results show that simply maximizing the atomization rate creates large droplets on the surface of the heater, which slows down the vaporization process. Thus, an optimal atomization rate should be determined for ideal performance.

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“…In this section, the data presented in Table 1 will be adopted for modal analysis of the piezoelectric vibrator. According to the previous study [31], the variation of the micro-tapered aperture volume can be expressed as:…”

Section: Simulation and Experiments Of Vibration Characteristics Of Amentioning

confidence: 99%

“…After investigating the piezoceramic vibrating mesh atomizer, our research group discovered the phenomenon of the dynamic tapered angle [31]. Meanwhile, its presence via a series of experiments was conducted and the pumping effect of a dynamic tapered angle was revealed, which explains why a piezoceramic vibrating mesh atomizer can realize atomization.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influencing Factors of the Atomization Rate in a Piezoceramic Vibrating Mesh Atomizer

2020

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On the basis of previous study in our research group, the phenomenon of the dynamic tapered angle was founded, the occurrence of atomization is regarded to derive from the combined effects of the dynamic variation of the micro-tapered aperture, and the difference between forward and reverse flow resistance has been explained by both theories and experiments. It has been revealed that the main influencing factors of the atomization rate are driving voltage, driving frequency, and so on, while the root causes of the various atomization rates still need to be further clarified. In this paper, a micro-tapered aperture worked as a micron-sized tapered flow tube valveless piezoelectric pump in periodic variation. The working principle of such a micro-tapered aperture atomizer was analyzed in detail, and the corresponding formula of the atomization rate was also established. Through measuring the atomization rates at different working frequencies (f), it was established that when the f was set as 122 kHz, the atomization rate reached a maximum value. By building the relationship between the atomization rate and voltage at a fixed resonance frequency, it can be seen that the atomization rate increased with the increase of driving voltage. Subsequently, in order to measure their atomization rates, the micro-tapered apertures of three different outlet diameters were applied, so that the atomization rate was enhanced with the increase of the micro-tapered aperture diameter. Moreover, through examining the atomization rates at different temperatures, it was observed that the atomization rate rose with increasing temperature; while changing the liquid concentration, the atomization rate was also enhanced by the increase in its concentration. Apparently, the impact factors including working frequency, driving voltage, outlet diameter, temperature, and liquid concentration all exert some effects on the atomization rate. It is worth noting that at the first stage, these influence factors indirectly work on the micro-tapered aperture structure or flow state, followed by further effects on the flow resistance. As above-mentioned, in this work, we considered that the root cause influencing the atomization rate in a piezoceramic vibrating mesh atomizer can be attributed to the flow resistance.

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Effect of the Dynamic Cone Angle on the Atomization Performance of a Piezoceramic Vibrating Mesh Atomizer

Cited by 19 publications

References 45 publications

Vibration Analysis of a Piezoelectric Ultrasonic Atomizer to Control Atomization Rate

Vibration Analysis of a Piezoelectric Ultrasonic Atomizer to Control Atomization Rate

Atomization Control to Improve Soft Actuation Through Vaporization

Study on the Influencing Factors of the Atomization Rate in a Piezoceramic Vibrating Mesh Atomizer

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