3D FEM analyses on flow field characteristics of the valveless piezoelectric pump

Huang, Jun; Zhang, Jianhui; Shi, Weidong; Wang, Yuan

doi:10.3901/cjme.2016.0427.061

Cited by 34 publications

(16 citation statements)

References 20 publications

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“…The main methods utilized for calculating the flow field characteristics of aerostatic bearings include the finite element method (FEM) [25], the finite difference method (FDM) and CFD method [26]. The Reynolds equation can be solved efficiently by the FEM and FDM.…”

Section: Methods Of Calculationmentioning

confidence: 99%

Numerical Simulation and Experimental Verification of the Stiffness and Stability of Thrust Pad Aerostatic Bearings

Cui

Wang

et al. 2018

Chin. J. Mech. Eng.

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Many researchers concentrate on improving the stiffness and stability of aerostatic bearings, however the contradiction between stiffness and stability is still existed. Therefore, orifice, multiple, and porous restrictors are designed to illustrate the influence of restrictor characteristics on the stability and stiffness of the aerostatic circular pad bearings. Because both the stiffness and stability of aerostatic bearings are determined by the internal pressure distribution, the full Navier-Stokes (N-S) equations are applied to solve internal pressure distribution in bearing film by using computational fluid dynamics (CFD) method. Simulation results present that the stiffness and stability of aerostatic circular pad bearings are influenced significantly by geometrical and material parameters, such as film thickness, orifice diameters, and viscous resistance coefficient. Verified by the experimental data, the micro vibration of orifice restrictor is almost the same as multiple restrictors with amplitude of 0.02 m/s 2 , but it is much stronger than the porous restrictors with acceleration of 0.006 m/s 2 . The optimal stiffness of multiple restrictors increased by 46%, compared to only 30.2 N/μm of orifice restrictor, and the porous restrictors had obvious advantage in the small film thickness less than 6 μm where the optimal stiffness increased to 38.3 N/μm. The numerical and experimental results provide guidance for improving the stiffness and stability of aerostatic bearings. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Section: Methods Of Calculationmentioning

confidence: 99%

Numerical Simulation and Experimental Verification of the Stiffness and Stability of Thrust Pad Aerostatic Bearings

Cui

Wang

et al. 2018

Chin. J. Mech. Eng.

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“…[1][2][3] Valveless piezoelectric pumps mostly utilize flow resistance differential tube to replace the valve. The common flow resistance differential tube is diffuser/nozzle, Tesla tube, and Y-shaped tube [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Design and Testing of a Valveless Piezoelectric Pump with Conical Vortex Diodes

Zou

Huang

2020

MATEC Web Conf.

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The valveless piezoelectric pump delivers fluid based on the difference of flow resistance of internal tube. In this paper, a vortex diode with conical tangential tube is proposed, which possesses the great characteristic of reverse cut-off, and the analysis of the forward and reverse flow resistance of the conical vortex diode is verified by finite element analysis. Then, a valveless piezoelectric pump with conical vortex diodes as the internal channel is designed, and the prototype is manufactured. The results of the output performance experiment show that the maximum output flow rate of the valveless piezoelectric pump is 10.44 g/min at the drive frequency of 45Hz, and the maximum output pressure is 560 Pa at the drive frequency of 35Hz. The proposal of the valveless piezoelectric pump provides a good reference for more new types of valveless piezoelectric pumps.

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“…1.2 应力场数学模型构件淬火过程中的应力场计算，本质上是热弹塑性问题，在计算应力时需要综合考虑温度和应力的耦合作用 [15] 。并采用增量刚度法求解应力场，整体势能泛函为 [16][17] ，材料的化学成分如表 1 所示。使用低导热系数的涂层作为构件薄壁部分的修饰层，模拟计算时采用的 ZL205A 材料物性参数参考文献 [18][19] [9] YANG Xiawei，ZHU Jingchuan，NONG Zhisheng，et al…”

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Quasi-synchronous Quenching Micro Distortion in ZL205A Aluminum Alloy Large Thin-wall Workpiece Based on Equal-Biot Number

Yan¹

2018

JME

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Abstract：The equal-Biot number model, on differential wall thickness and/ or differential wall structure workpieces heating or quenching zero distortion, proposed by the researchers for the worldwide problem on the distortion control of workpieces during hot processing. Overall heat transfer coefficient h is replaced by Biot number for the first time. Biot number is introduced into the temperature field equation, and the coupled model of dynamic temperature field and stress field which changes with Biot number is built. The temperature field and stress field in ZL205A aluminum alloy differential wall thickness workpiece is predicted by ABAQUS software.The simulation results indicate that the quenching distortion in ZL205A aluminum alloy workpiece stem from the difference in temperature between thick-wall parts and thin-wall parts. The ratio of thin-wall thickness to thick-wall thickness of this workpiece is one to four, the maximum difference in temperature is 276 ℃ between thin-wall keypoints and thick-wall keypoints, the maximum thermal stress is 84 MPa in thick-wall parts more than the yield strength of this alloy on the corresponding temperature, and then the radial distortion occurred, on the 0.37 s quenching time after solution 540 ℃. The equal-Biot number of the differential wall thickness is achieved by coating high heat conduction layers to thick-wall parts or low heat conduction layers to thin-wall parts. The distortion after 540 ℃ solution and quenching is predicted. The results indicate that the quenching distortion reducing 82.6 percent compared with the workpiece without coating layer. The quasi-synchronous quenching of differential wall thickness workpiece is achieved.Key words：ZL205A aluminum alloy；differential wall thickness workpiece；equal-Biot number；finite element simulation；micro distortion；quasi-synchronous quenching * 国家自然科学基金资助项目(U1537201)。20170715 收到初稿，20180111 收到修改稿

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3D FEM analyses on flow field characteristics of the valveless piezoelectric pump

Cited by 34 publications

References 20 publications

Numerical Simulation and Experimental Verification of the Stiffness and Stability of Thrust Pad Aerostatic Bearings

Numerical Simulation and Experimental Verification of the Stiffness and Stability of Thrust Pad Aerostatic Bearings

Design and Testing of a Valveless Piezoelectric Pump with Conical Vortex Diodes

Quasi-synchronous Quenching Micro Distortion in ZL205A Aluminum Alloy Large Thin-wall Workpiece Based on Equal-Biot Number

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