Numerical study and experimental validation of a valveless piezoelectric air blower for fluidic applications

IEEE Trans. Plasma Sci.

Terebessy³

et al. 2016

We present a simple and efficient airflow generator utilizing the effect of ion wind by generating simultaneously both the positive and negative ions from two sharp electrodes mounted parallel to each other. The unique bipolar geometrical setup eliminates the effect of space charge by the high recombination rate of oppositely charged ions. The two-electrode arrangement is symmetrical, where the electrode creating charged ions of one polarity also serves as the reference electrode to establish the electric field required for ion creation by the opposite electrode, and vice versa. Unlike the conventional setup, with a single electrode generating ion wind with movement toward the reference electrode, in this configuration the air movement is parallel to the electrodes, and is directed away from the device. The airflow behavior is studied by both experiments and numerical simulation. The ion wind speed has a linear relationship with the square root of the discharge current, U ∝ √ I, and its measured values agree well with simulation. The characterization of the discharge current-voltage relationship was derived from mathematical processing in the general formThe ion wind speed and the current-voltage characteristics depend on the interspace between the electrodes and the electrode geometry. An ion wind speed on the order of ms −1 is created with a microampere discharge current, resulting in a total net charge of only several femtoampere. The proposed configuration is beneficial in minimizing the power consumption of the system, and in enabling air recirculation for airflow control applications, cooling applications, propulsion technology, and micropump design, especially for the applications where neutralized ion wind flow is required.Index Terms-Bipolar corona discharge, electrohydrodynamics, ion wind, parallel pin.0093-3813 of Engineering and Technology, VNUH. He has authored or co-authored more than 60 scientific articles and seven inventions. His current research interests include 3-D system integration technology and MEMS-based sensors, actuators, and applications.

Section: Introductionmentioning

confidence: 99%

Ion Wind Generator Utilizing Bipolar Discharge in Parallel Pin Geometry

Dau

IEEE Trans. Plasma Sci.

Terebessy³

et al. 2016

“…The result shows that the output voltage of the hotwire increases with the increase of the driving voltage of the PZT. This can be explained as a larger deformation of the diaphragm due to a stronger VPZT produces a higher flow velocity [23].…”

Section: Experimental Achievementsmentioning

confidence: 99%

Angular Rate Sensing by Circulatory Vortex Flow: Design, Simulation and Experiment

Phan

2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems &Amp; Eurosensors XXXIII (TRANSDUCERS &Am

Tran

et al. 2019

A fully packaged convective vortex gyrometer actuated by a PZT diaphragm is reported. The flow circulates at higher velocity after each actuating circle to form a vortex in the desired chamber. The vortex is characterized by hotwire anemometry. The device is initially designed based on a numerical analysis whose results are used to set up the experiment. The angular rate sensing of the device is successfully tested using a turntable. The technique is a potential solution to various applications related to inertial sensing and fluidic amplifier.

“…where the parameters are defined in the nomenclature. When a hotwire heated by an electric current I is subjected to a variation of cooling air velocity ( , the temperature variation of the hotwire ( ) is converted into a relative variation of resistance by (22) Substituting Eq. 21into (22) yields the relationship between the hotwire resistance and the applied angular velocity as follows [38].…”

Section: Angular Rate Sensing By Hotwire Anemometrymentioning

confidence: 99%

“…Among them, several typical techniques can be cited as follows. A lead zircona-titanate (PZT) diaphragm is used to create a continuous direct flow which is then rectified into suitable chambers [20]- [22]. Alternatively, a jet flow can be released using an electroconjugate fluid, where it is activated by electrohydrodynamics in a high electric field between two electrodes submerged in a liquid [23]- [25].…”

Section: Introductionmentioning

confidence: 99%

Fluidic mechanism for dual-axis gyroscope

Dau

Mechanical Systems and Signal Processing

Tran

et al. 2018

In this paper, we report a further study of flow-network generating four jet flows which circulate in a sealed device to experimentally investigate the feasibility and efficiency of a dual-axis gyroscope. The experiment is carried out successfully and the experimental results reasonably agreed with those obtained by numerical analysis using OpenFOAM. The flow rectifying coefficient is determined using the mathematical lump model for a vibrating system, which takes into account of the device geometry and resonant frequency. Experimental and numerical results demonstrate that the coefficient of the new system developed in this study is significantly higher than those of conventional designs. The hotwire-integrated device which can function as a dual-axis gyroscope is tested using a turntable with speeds up to 1900 rpm. The scale factor and cross-sensitivity of the system are 0.26 μVs/° and 1.2 %, respectively. The cross-sensitivity and the effects of linear acceleration, actuating voltage on the diaphragm, heating power and position of hotwires are also investigated.