The Optimization Analysis on Piezoelectric Micromixer With Modified Tesla Tubes

2011 ◽  
Author(s):  
Xiuhua He ◽  
Hongcai Zhuo ◽  
Xulian Deng ◽  
Jian Wang ◽  
Fu Li
Keyword(s):  
Numerical Analysis ◽  
Piezoelectric Actuator ◽  
Structure Parameters ◽  
Optimization Analysis ◽  
Two Fluids ◽  
Mesh Model ◽  
Perfect Mixing ◽  
Working Principle ◽  
Working Performance ◽  
L1 And L2

With consideration of the good configuration of Tesla tube and its perfect performance used in micromixer and micropump, an integration of micromixer and micropump, a novel type of piezoelectric micromixer has been designed. In order to improve the performance of the micromixer, analysis on structure parameters of the Tesla tube, and the optimization on it is the chief work in this paper. Firstly, a novel type of piezoelectric micromixer with Tesla tubes and piezoelectric actuator has been designed, and its structure and working principle were described. Secondly, the numerical analysis on the micromixer with prearranged parameters was carried out to analyze its pumping and mixing performances. Thirdly, an optimization on the structure to improve its performance was carried out. The values of three main structure parameters of the Tesla tube, K = W1/W3, L1 and L2 were changed to analyze their effects on λ and σ which stand for pumping and mixing performances respectively, then two groups perfect values of those three parameters were selected for optimization. Finally, a perfect design scheme was selected to be structure of mixer; numerical analysis was carried out on it in application of dynamic mesh model. Two fluids arrived perfect mixing after 0.4s with the value of Reynolds number 200, at driven frequency 100Hz, middle displacement amplitude of piezoelectric actuator 15μm. This result demonstrates that, pumping and mixing performances of the piezoelectric micromixer were validated, and its working performance has been improved with the optimization on Tesla tubes, which can be reference for study afterward.

Research of the Punching Mechanism and Design of the Punching Device of the Peanut Mulching Film and Punching Planter

2014 ◽  
Vol 602-605 ◽  
pp. 507-510
Author(s):  
Xiao Lian Lü ◽  
Wei Wang ◽  
Xiao Rong Lü ◽  
Wei Ming Wu
Keyword(s):  
Structure Parameters ◽  
Design And Development ◽  
Main Structure ◽  
Existing Problems ◽  
Parameter Equation ◽  
Working Principle ◽  
Punching Process ◽  
Mulching Film

According to the technology requirement and existing problems of the key working parts (punching device) of the peanut mulching film and punching planter, the punching device of the peanut mulching film and punching planter was designed adapt to first mulching film and then sowing. It was introduced the structure and working principle of the punching device, and the punching mechanism are studied. The trajectory of the punching parts was analyzed in the punching process, and the parameter equation of the punching profile was established. On the basis, the main structure parameters of the punching device were analyzed and optimized. The study provides reference and basis for the design and development of the peanut mulching film and punching planter.

Energy Analysis for a Twisting and Bending Coupled Piezoelectric Actuator for Miniature Unmanned Aerial Vehicles

2001 ◽  
Author(s):  
Seung-Keon Kwak ◽  
Gregory Washington
Keyword(s):  
Numerical Analysis ◽  
Unmanned Aerial Vehicles ◽  
Lead Zirconate Titanate ◽  
Piezoelectric Actuator ◽  
Energy Analysis ◽  
Middle Layer ◽  
Lead Zirconate ◽  
Aircraft Wing ◽  
Aerial Vehicles ◽  
Electrode Technique

Abstract In this research, we examine aircraft components based on their interaction with the system. This essentially asks the question is there enough energy available (without losses) in a candidate system to meet the energy required. The goal of this research is to highlight this design process with the design and construction of an active aircraft wing. A new twisting and bending coupled piezoelectric actuator based on the spatial aperture shading technique is introduced to build deformable wings. The shaped electrode twisting actuator consists of two layers of PZT-5H (lead zirconate titanate) and one middle layer of steel shim. The directionally shaped electrode technique is applied to achieve the both twisting and bending motions of the actuator. The comparison of an analytical model, a numerical analysis, and actual experimental results for the actuator are given.

Simulation Analysis of Synchronization Control for Ultrahigh Pressure Sterilization Equipment Based on AMESim

2014 ◽  
Vol 496-500 ◽  
pp. 1340-1343
Author(s):  
Gui Hua Fang ◽  
Xiao Yan Li
Keyword(s):  
Hydraulic System ◽  
Simulation Analysis ◽  
Hydraulic Cylinder ◽  
Synchronous Motor ◽  
Ultrahigh Pressure ◽  
Synchronization Control ◽  
Working Principle ◽  
Working Performance ◽  
Sterilization Equipment ◽  
Synchrony Measure

This paper introduces the working principle of the ultrahigh pressure sterilization equipment, the hydraulic system of hydraulic cylinder promoting the plug moving is analyzed by simulation, and then the hydraulic system added synchronous motor is analyzed by simulation, which found that the latter hydraulic system has higher synchrony measure , and it can improve the working performance of the original equipment, and it has certain reference significance to the improvement of the hydraulic system of the equipment.

Numerical Analysis of a Rooftop Vertical Axis Wind Turbine

2011 ◽  
Author(s):  
N. Cristobal Uzarraga-Rodriguez ◽  
A. Gallegos-Mun˜oz ◽  
J. Manuel Riesco A´vila
Keyword(s):  
Numerical Analysis ◽  
Wind Turbine ◽  
Numerical Study ◽  
Vertical Axis ◽  
Turbine Rotor ◽  
Aerodynamic Performance ◽  
Power Coefficient ◽  
Vertical Axis Wind Turbine ◽  
Sliding Mesh ◽  
Mesh Model

A numerical analysis of a rooftop vertical axis wind turbine (VAWT) for applications in urban area is presented. The numerical simulations were developed to study the flow field through the turbine rotor to analyze the aerodynamic performance characteristics of the device. Three different blade numbers of wind turbine are studied, 2, 3 and 4, respectively. Each one of the models was built in a 3D computational model. The effects generated in the performance of turbines by the numbers of blades are considered. A Sliding Mesh Model (SMM) capability was used to present the dimensionless form of coefficient power and coefficient moment of the wind turbine as a function of the wind velocity and the rotor rotational speed. The numerical study was developed in CFD using FLUENT®. The results show the aerodynamic performance for each configuration of wind turbine rotor. In the cases of Rooftop rotor the power coefficient increases as the blade number increases, while in the case of Savonius rotor the power coefficient decrease as the blades number increases.

The Analysis and Treatment to Lube Oil Separator’s Leakage

2011 ◽  
Vol 328-330 ◽  
pp. 734-737
Author(s):  
Shu Ye Sun ◽  
Guo Yong Zhang
Keyword(s):  
Working Condition ◽  
Basic Structure ◽  
Oil Leakage ◽  
Good Working ◽  
Failure Point ◽  
Working Principle ◽  
Working Performance ◽  
Sealing Elements

The lube oil separator is widely used in lube oil system of merchant vessel. The lube oil separator functions to purify the lube oil to ensure its good working performance. The working condition of the oil separator will greatly influence the normal running of many plants. The lube oil separator used in our laboratory is Mitsubishi SJ700. In the processing of purifying, oil leakage from the water outlet is found. In order to find failure point, the basic structure and the working principle of the separator is introduced. The separator is dismantled according to the procedure. After cleaning some parts found dirty and replacing some sealing elements, the separator is reassembled. When starting the separating process again, the failure remains. Through further analyzing the structure and working principle of the separator, the trouble spot is found out. After removing the failure, the separator finally is repaired. To prevent similar accident occurring again, some suggestions are presented.

scholarly journals Numerical analysis of reinforced concrete shear walls with rectangular cross section

2020 ◽  
Vol 13 (6) ◽  
Author(s):  
Maurício Castelo Branco de Noronha Campos ◽  
Paulo Marcelo Vieira Ribeiro ◽  
Romilde Almeida de Oliveira
Keyword(s):  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Cross Section ◽  
Rectangular Cross Section ◽  
Concrete Columns ◽  
Second Order ◽  
Order Effects ◽  
Cross Sectional ◽  
Reinforced Concrete Columns ◽  
Mesh Model

abstract: This study addresses a numerical analysis of reinforced concrete columns in which the lengths are significantly larger than their widths with a rectangular cross section. Numerical simulations of 1,440 cases were performed, each case simulated with the single bar model, isolated bar model and mesh model, in addition, 3D model simulations were carried out. For the validation of 3D models and bar models, comparisons were made between the numerical simulation e experimental results of 24 reinforced concrete columns. Second order effects were analyzed on the vertical moment at the edge of the columns in which the lengths are significantly larger than the widths (localized second-order effects) and also the values of the horizontal moments along the cross sectional length in the mesh model. Influences of the main variables were observed influencing the behavior of the columns in which the lengths are significantly larger than their widths: the ratio between the cross sectional dimensions, the slenderness and the stresses (normal stress and bending moment around the axis of greatest inertia).

scholarly journals Performance analysis of a four-stroke compressed air engine

2020 ◽  
Vol 24 (1 Part A) ◽  
pp. 113-126
Author(s):  
Fancong Zeng ◽  
Jinli Xu
Keyword(s):  
Mathematical Model ◽  
Experimental System ◽  
Compressed Air ◽  
Work Efficiency ◽  
Supply Pressure ◽  
Numerical Studies ◽  
Optimizing Design ◽  
Working Principle ◽  
Working Performance ◽  
Set Up

The purpose of this paper is to investigate working performance for a four-stroke compressed air engine via numerical studies. A mathematical model is developed to study the influence of several operative parameters on working performance. The mathematical model consists of thermodynamic model, each stroke model and dynamic model. In addition, a working principle and an experimental system of the compressed air engine are set up. The aims are: to introduce the novel four-stroke engine and to quantify the influence of rotational speed, supply pressure and supply temperature on working characteristics. The simulation and analysis show several meaningful results. The compressed air engine has higher cylinder pressure and work efficiency in lower speed stage, and the increase of the supply pressure can effectively improve indicated work and work efficiency. However, supply temperature has little effect on the performance of the compressed air engine. Therefore, the study of this work will provide a certain guidance function for further study on optimizing design of the compressed air engine.

Numerical analysis of the Rayleigh–Taylor instability in an electric field

2016 ◽  
Vol 792 ◽  
pp. 397-434 ◽  
Author(s):  
Qingzhen Yang ◽  
Ben Q. Li ◽  
Zhengtuo Zhao ◽  
Jinyou Shao ◽  
Feng Xu
Keyword(s):  
Fluid Flow ◽  
Numerical Analysis ◽  
Numerical Model ◽  
Electric Field ◽  
Linear Analysis ◽  
Dielectric Constants ◽  
Interfacial Morphology ◽  
Two Fluids ◽  
Rayleigh Taylor Instability ◽  
Nonlinear Regimes

A numerical analysis is presented of the Rayleigh–Taylor instability (RTI) in the presence of an external electric field, with an emphasis on nonlinear phenomena associated with the evolution of complex interfacial morphology. The Poisson equation for the electric field and the Navier–Stokes equation for fluid flow field are solved simultaneously along with the Cahn–Hilliard phase field equation for interface deformation and morphology development. Numerical model is validated against the existing data and the results of linear analysis. Extensive numerical simulations are carried out for a wide range of fluid flow and electric field conditions. Computed results show that, in both linear and nonlinear regimes, a horizontal field suppresses the RTI, while a vertical electric field aggravates it. However, the vertical field does not affect the secondary instability; specifically, it does not contribute to the baroclinical generation of vorticity and consequently does not affect the roll-up formation. Linear analysis predicts that the RTI remains the same with the interchange of the dielectric constants of the two fluids, which is also confirmed by the numerical model for small interface deformations. This prediction, however, does not hold true in the nonlinear regimes in that complex interfacial morphology may evolve quite differently if the dielectric constants of two fluids are interchanged.

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