scholarly journals Development of a Piezo-Driven Liquid Jet Dispenser with Hinge-Lever Amplification Mechanism

Micromachines ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 117 ◽  
Author(s):  
Mojiz Abbas Trimzi ◽  
Young Bog Ham ◽  
Byeung Cheol An ◽  
Young Min Choi ◽  
Jung Ho Park ◽  
...  
Keyword(s):  
Performance Improvement ◽  
Adhesive Bonding ◽  
Piezoelectric Actuators ◽  
Working Fluid ◽  
Liquid Jet ◽  
Quick Response ◽  
Microelectronics Packaging ◽  
Compact Structure ◽  
Novel Device ◽  
Amplification Mechanism

Owing to the quick response, compact structure, high precision, huge blocking force generation, and ease of operation, piezoelectric actuators are urgently being adopted in the field of advanced dispensing for jetting performance improvement and fulfillment of precision requirements in microelectronics packaging, adhesive bonding, and miniaturization industry. This research focuses on the fundamental design and development of a piezo-electrically driven compact fluid dispenser using the principle of a class-one lever for amplification of needle displacement, and enhancement of application areas of the developed jet dispenser. Using fundamental lever principle, geometry-based modelling is carried out to fabricate a working prototype of a normally closed hinge-lever type dispenser. Preliminary experiments are carried out to witness the workability of the fabricated dispenser to deliver 100 dots of working fluid per second that will provide a novel device for dispensing of various fluids, and the proposed amplification mechanism suits various other piezoelectric applications as well.

scholarly journals Improving Output Performance of a Resonant Piezoelectric Pump by Adding Proof Masses to a U-Shaped Piezoelectric Resonator

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 500
Author(s):  
Jian Chen ◽  
Wenzhi Gao ◽  
Changhai Liu ◽  
Liangguo He ◽  
Yishan Zeng
Keyword(s):  
Flow Rate ◽  
Maximum Flow ◽  
Working Fluid ◽  
Driving Voltage ◽  
Piezoelectric Resonator ◽  
Piezoelectric Pump ◽  
Compact Structure ◽  
Output Performance ◽  
Volume Efficiency ◽  
Working Efficiency

This study proposes the improvement of the output performance of a resonant piezoelectric pump by adding proof masses to the free ends of the prongs of a U-shaped piezoelectric resonator. Simulation analyses show that the out-of-phase resonant frequency of the developed resonator can be tuned more efficiently within a more compact structure to the optimal operating frequency of the check valves by adjusting the thickness of the proof masses, which ensures that both the resonator and the check valves can operate at the best condition in a piezoelectric pump. A separable prototype piezoelectric pump composed of the proposed resonator and two diaphragm pumps was designed and fabricated with outline dimensions of 30 mm × 37 mm × 54 mm. Experimental results demonstrate remarkable improvements in the output performance and working efficiency of the piezoelectric pump. With the working fluid of liquid water and under a sinusoidal driving voltage of 298.5 Vpp, the miniature pump can achieve the maximum flow rate of 2258.9 mL/min with the highest volume efficiency of 77.1% and power consumption of 2.12 W under zero backpressure at 311/312 Hz, and the highest backpressure of 157.3 kPa under zero flow rate at 383 Hz.

Thermal Performance Improvement of a Heat Sink With Piezoelectric Vibrating Fins

2010 ◽  
Author(s):  
Hee Seung Park ◽  
Sung Jin Kim
Keyword(s):  
Natural Frequency ◽  
Performance Improvement ◽  
Thermal Performance ◽  
Vibration Frequency ◽  
Heat Sink ◽  
Vibration Amplitude ◽  
Piezoelectric Actuators ◽  
Convection Heat ◽  
Heat Transfer Characteristics ◽  
Heat Sink Temperature

A heat sink with piezoelectric vibrating fins is developed through attaching piezoelectric actuators to the fins of a heat sink, and the heat transfer characteristics of the heat sink are experimentally investigated. Thermal performance improvement of the heat sink by the vibration of the fins is observed compared to the thermal performance of a natural convection heat sink with static fins under a fixed heat sink geometry condition. The thermal performance of the heat sink changes as the vibration amplitude of the fins or the vibration frequency of the fins changes. Particularly, if the vibration frequency of the fins matches up to the natural frequency of the fins, the vibration amplitude is significantly increased by resonance and the thermal performance also increases. The natural frequency of the fins changes with the heat sink temperature because the geometry of the fins changes and the properties of the fins change due to the temperature change.

Centrifugal Manometer

1959 ◽  
Vol 81 (3) ◽  
pp. 341-348
Author(s):  
J. F. Kemp
Keyword(s):  
High Sensitivity ◽  
Working Fluid ◽  
Quick Response ◽  
Laboratory Conditions ◽  
Wide Range ◽  
Maximum Range ◽  
Normal Laboratory

The operating principles and mechanical construction of a micromanometer, which utilizes air in lieu of a liquid as working fluid, are described. Some of the noteworthy features of the instrument include its high sensitivity and accuracy, quick response, wide range, and ease of manipulation. Differential pressures of the order of 5 × 10−3 mm water gage can be measured with an error of 1 per cent under normal laboratory conditions. The maximum range of the prototype described is 25 mm water gage, and the corresponding error at this value amounts to about 0.25 per cent.

Ultrasonically Driven Cavitating Atomizer: Prototype Fabrication and Characterization

2009 ◽  
Author(s):  
Nelson K. Akafuah ◽  
Abraham J. Salazar ◽  
Kozo Saito ◽  
Vedanth Srinivasan
Keyword(s):  
Liquid Flow Rate ◽  
Injection Pressure ◽  
Working Fluid ◽  
Liquid Jet ◽  
New Device ◽  
Liquid Injection ◽  
Fabrication And Characterization ◽  
Pressure Modulation ◽  
Experimental Rig

A new device, ultrasonic cavitating atomizer (UCA), has been developed that uses ultrasonically driven cavitation to produce fine droplets. In the UCA the role of cavitation is explicitly configured to enhance the breakup of the liquid jet exiting the nozzle into fine droplets; the pressure modulation also assists the breakup process. The experimental study involves the fabrication of a prototype and the building of an experimental rig to test the prototype using water as the working fluid. The parameters tested include liquid injection pressure, horn tip frequency and liquid flow rate. The result shows improvement in the atomization of water with the application of ultrasonic cavitation.

Slot loaded EBG-based metasurface for performance improvement of circularly polarized antenna for WiMAX applications

2019 ◽  
Vol 12 (3) ◽  
pp. 212-220 ◽  
Author(s):  
Alka Verma ◽  
Anil Kumar Singh ◽  
Neelam Srivastava ◽  
Shilpee Patil ◽  
Binod Kumar Kanaujia
Keyword(s):  
Performance Improvement ◽  
Coplanar Waveguide ◽  
Axial Ratio ◽  
Impedance Bandwidth ◽  
Compact Structure ◽  
Circularly Polarized ◽  
Feed Line ◽  
Rectangular Patch ◽  
Low Profile ◽  
Good Agreement

AbstractIn this paper, an electromagnetic band gap (EBG) metasurface (MS) superstrate-based circularly polarized antenna for the WiMAX (3.5 GHz) band is proposed. The proposed structure comprises a 2 × 2 slot-loaded rectangular patch MS array that can be perceived as a polarization-dependent EBG MS superstrate. Furthermore, to achieve circular polarization, the proposed antenna has an inclined coupling slot onto the ground with a conventional coplanar waveguide feed line. The proposed antenna has a compact structure with a low profile of 0.037λ0 (λ0 stands for the free-space wavelength at 3.48 GHz) and a ground size of 30 × 30 mm2. The measured results show that the −10 dB impedance bandwidth for the proposed antenna is 34.6% and the 3-dB axial ratio (AR) bandwidth is 6.8% with a peak gain of 3.91 dBi in the desired operating band. Good agreement between the simulated and the measured results verifies the performance of the proposed antenna.

scholarly journals STRESS STATE COLUMNS OF TUBING STRING DURING OPERATION PULSED DOWNHOLE DEVICE

2018 ◽  
pp. 94-99 ◽  
Author(s):  
M. Ya. Khabibullin ◽  
R. I. Suleymanov ◽  
D. I. Sidorkin ◽  
L. Z. Zainagalina
Keyword(s):  
Thermal Conductivity ◽  
Stress State ◽  
Flow Rate ◽  
Working Fluid ◽  
Liquid Jet ◽  
Design Features ◽  
Liquid Pressure ◽  
Tensile Stresses ◽  
Dissipative Processes ◽  
Tubing String

When treating the bottomhole zone, the working fluid is supplied to the bottom unevenly due to the fact that the units are equipped with piston pumps. The changing amplitude of the liquid pressure is triggered in the pulsed downhole device. As a result, longitudinal oscillations are created in the tubing string. As the oscillations of the liquid propagate, their amplitude decreases. For these conditions, this is due to dissipative processes, which are called viscosity and thermal conductivity of the medium, the influence of the walls, and also scattering by inhomogeneities. We obtained expressions for determining the forced dynamic displacements and tensile stresses in each section of the tubing string, on which graphical dependences are plotted. As a result of the analysis of these curves, it was found that the usage of pulsed downhole device with a larger area of resistance to the flow of a liquid jet reduces the reliability of the tubing string, and it depends directly on both the design features of the device and the flow rate of fluid pumped into the formation. We also revealed that the reliability of the tubing string is increased by 1,8 times when using a packer for the equipment of the bottomhole of the treated well.

scholarly journals Design and Analysis of a Novel Piezo-Actuated XYθz Micropositioning Mechanism with Large Travel and Kinematic Decoupling

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Ruijiang Xiao ◽  
Shubao Shao ◽  
Minglong Xu ◽  
Zijian Jing
Keyword(s):  
Piezoelectric Actuators ◽  
Output Coupling ◽  
Rotational Angle ◽  
Output Displacement ◽  
Compact Size ◽  
Motion Range ◽  
Rotational Part ◽  
Large Motion ◽  
Amplification Mechanism ◽  
Nonuniform Beam

A novel hybrid-type XYθz micropositioning mechanism driven by piezoelectric actuators is proposed in this paper. With the purpose of realizing a large motion range and 3-DoF independent motion within a compact size, the mechanism is designed using a symmetric translational part and a rotational part that are linked serially. The translational part is based on a double-amplification mechanism incorporating a guidance mechanism for decoupling; the rotational part uses a nonuniform beam with an amplification mechanism to translate the linear output displacement of piezoelectric actuators into a large rotational angle around the Z axis. To precisely predict the output displacements and implement dimensional design, electromechanical models of the translational mechanism and rotational mechanism are established. According to the theoretical model, dimensional optimization is carried out to achieve large motion ranges within a compact size. A prototype of the proposed mechanism is fabricated according to the optimized results, and the performance of the mechanism is validated by experiment. The experimental results show that translational travel in X and Y directions of 204.2 μm and 212.8 μm, respectively, and travel of 8.7 mrad in the θz direction can be realized in a small size of 106 mm × 106 mm × 23 mm. And, the output coupling was evaluated to be below 3%, indicating an excellent decoupling performance.

scholarly journals Experimental and Numerical Investigation of Nanofluid Usage in a Plate Heat Exchanger for Performance Improvement

2019 ◽  
Vol 8 (1) ◽  
pp. 27 ◽  
Author(s):  
Adnan Sözen ◽  
Ataollah Khanları ◽  
Erdem Çiftçi
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Numerical Investigation ◽  
Performance Improvement ◽  
Active Agent ◽  
Plate Heat Exchanger ◽  
Deionized Water ◽  
Working Fluid ◽  
Improvement Rate ◽  
Plate Heat

Plate heat exchangers, a compact-type heat exchanger, are commonly used heat transfer devices because of their superior characteristics. Their thermal performances are strongly dependent to working fluid circulating inside the system. The influences of nanofluid utilization as the working fluid in a plate heat exchanger was experimentally and numerically analysed in this study. In order to show off the improvement rate in heat transfer, the experiments were performed by using deionized water and TiO2-deionized water nanofluid. The nanofluid was prepared at the rate of 1.5 % as weighted. A surface-active agent, Triton X-100, was also doped into the mixture at the rate of 0.2% of a final concentration to prevent the sedimentation and flocculation of the nanoparticles inside the solution. The experiments were performed in different temperatures as 40°C, 45°C, 50°C and varying cold fluid mass flow rates as 3,4, 5, 6 and 7 lpm.  In addition, using the experimental data, a numerical simulation was realized by ANSYS Fluent software.  The both results indicate that heat transfer rate in plate heat exchanger can be improved using nanofluid as the working fluid in place of deionized water. The maximum improvement rate in heat transfer was obtained as 11 % in experimental study. It is also seen that experimental and numerical results are in good agreement.©2019. CBIORE-IJRED. All rights reservedArticle History: Received May 18th 2018; Received in revised form October 17th 2018; Accepted January 8th 2019; Available onlineHow to Cite This Article: Sözen, A., Khanlari, A., and Çiftçi, E. (2019) Experimental and Numerical Investigation of Nanofluid Usage in a Plate Heat Exchanger for Performance Improvement. Int. Journal of Renewable Energy Development, 8(1), 27-32.https://doi.org/10.14710/ijred.8.1.27-32

Design of a Compact 3-DOF In-Plane Motion Stage

2013 ◽  
Vol 753-755 ◽  
pp. 863-866
Author(s):  
Jae Hyun Park ◽  
Hak Jun Lee ◽  
Dae Gab Gweon ◽  
Dong Pyo Hong
Keyword(s):  
Piezoelectric Actuators ◽  
Plane Motion ◽  
Bridge Type ◽  
Flexure Guide ◽  
Motion Stage ◽  
Amplification Mechanism

This paper presents the design of a new compact three-axis in-plane motion stage which work directions are X, Y, θz. The proposed stage consists of four amplification flexure structures and four piezoelectric actuators. The amplification structure uses bridge type amplification mechanism and notch type flexure guide hinge. The size of the stage is 150×150×30mm3 and has 50×50mm2 hollow in the center of the stage.

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