Abstract
In order to solve the problems of large reflux and low output performance of the valveless piezoelectric pump with conical tubes, the valveless piezoelectric pump with hyperbolic tubes was proposed. However, the previous research only paid attention to the difference of forward and reverse flow resistance inside the tubes. For this reason, the prototypes of conical tube valveless piezoelectric pump and hyperbolic tubes valveless piezoelectric pump were fabricated in this paper. The maximum output flow rate of the valveless piezoelectric pump with hyperbolic tubes was 54 ml/min. Subsequently, the size and position of entropy production of the hyperbolic tube and the conical tube were numerically calculated based on entropy production theory in this paper. The results show that the entropy production rate of the hyperbolic tube was significantly lower than that of the conical tube, which is consistent with the experimental results. This research analyzed the energy loss inside the valveless piezoelectric pump by using the entropy generation theory, and provided a new design and research method for improving the output performance of the valveless piezoelectric pump in the future.
Highlights
As the core component of the micro-fluid control system, the output performance of the micro pump determines the characteristics of the entire system
The hyperbolic tube is made by changing the structure of the conical tube, that is, the gradually expanding straight wall of the conical tube is changed to a hyperbolic wall, and the throat of the conical tube is changed to a circular arc transition section
The output flow rate of the piezoelectric pump with hyperbolic tubes is measured at a frequency of 40 Hz, which is 54 ml/min
Summary
As the core component of the micro-fluid control system, the output performance of the micro pump determines the characteristics of the entire system. According to whether there are valves inside, piezoelectric pumps can be divided into valve piezoelectric pumps and valveless piezoelectric pumps (Singhal et al, 2004; Li et al, 2021). The valve is easy to wear and there is a risk of fatigue damage, which greatly reduces the reliability of the valve piezoelectric pump. Compared with the former, the valveless piezoelectric pump uses a fluid diode to replace the active valve, which simplifies the structure of the valveless piezoelectric pump, makes it easy to miniaturize, and improves the system integration (Zhang et al, 2017)
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