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1.
传统是采用导电纸来描绘静电场,但描绘的过程中存在不利因素。为提高描绘的精确度,采用不同浓度NaCl溶液,比较不同浓度的导电质液体对静电场描绘的影响。同时利用origin软件对数据处理,探讨溶液浓度对平均精确度的影响。研究表明当NaCl溶液浓度为9%时,平均精确度最大,且origin软件处理数据更简洁和精确。  相似文献   

2.
静电场描绘仪的改进   总被引:6,自引:1,他引:5  
利用稳恒电流场在导体中的分布可以模拟静电场的分布.传统的静电场描绘仪存在着一系列缺陷,针对传统静电场描绘仪的不足作了部分的改进.通过实验比较,改进后的描绘仪能很好地模拟静电场.  相似文献   

3.
将双层式静电场描绘仪改为单层式静电场描绘仪.电极从面接触改为线接触。  相似文献   

4.
传统的模拟法静电场描绘仪存在的缺陷,针对这些缺陷提出了改进方案.通过实验比较,改进后的描绘仪能很好地模拟描绘静电场,值得推广.  相似文献   

5.
静电场描绘装置的改进   总被引:1,自引:1,他引:0  
阐述了利用水作导电介质对静电场描绘装置的改进结果. 测试情况表明, 使用改进后的装置, 操作更简便直观, 测试结果较精确.  相似文献   

6.
引言 静电场描绘是国内外高等院校普遍开设的物理实验.由于直接描绘静电场存在很大困难,而稳恒电流场在导体中的分布规律--电流与电势差的分布规律和静电场中场强与电位差的分布规律可以用相同的数学关系式表达,所以通常是用稳恒电流场来模拟静电场.  相似文献   

7.
本文介绍了一种新型模拟静电场描绘仪 ,利用它能精确地描绘出几种模拟静电场。  相似文献   

8.
分析了传统导电微晶静电场描绘仪存在的缺陷,通过对实验仪器进行改进,消除了由于探针装置及电路设计等问题引入测量的误差,实验结果表明,改进后描绘仪提高了模拟描绘静电场准确度,减少了实验系统误差。  相似文献   

9.
乔卫平  陈新雷 《物理实验》1994,14(4):149-150
用模拟法研究静电场──静电场的等势线,电力线的描绘乔卫平,陈新雷(上海交通大学200030)静电场描绘是国内外理工类院校普遍开设的物理实验.通常做法是用稳恒电流场的电压模拟静电场的电势分布,而对电力线和电极的电荷密度分布基本不作讨论,或仅在电磁学理论...  相似文献   

10.
虚拟仿真已成为大学物理实验教学中的重要技术手段,为加强静电场理论实验效果的认知,基于MATLAB App Designer开发了静电场描绘实验仿真软件,通过有限差分法得到数值解,利用MATLAB编写用户界面,实现了“同轴电缆”“平行直线电极”“聚焦电极”“劈尖电极”和“平行板电极”共5个电场测量的描绘,具有调节输入电压、测量等势点、描绘等势线与电场线等多项功能,并可将实验测量结果、解析公式与仿真结果进行对比.静电场描绘实验仿真软件的开发,有助于形象地认识静电场和建立完整的电场分析思维体系。  相似文献   

11.
在静电场中引入电位和电场强度后,通过等电位线图和场强分布图可以具体的描述静电场这种抽象的物质场。传统的静电场模拟实验直观地展现出了静电场的分布从而形象地描述了静电场,由于这种方法属于类比模拟,所以存在一定的缺陷(比如不直接,不能描述立体规律等等)。随着计算机技术的发展,利用计算机技术来模拟静电场等物质场逐渐成为趋势。通过借鉴大量资料简要地介绍了如何利用计算机模拟静电场,如何利用MATLAB软件模拟静电场的问题。  相似文献   

12.
《电磁学》中基本概念、基本规律理论性强、场图复杂.针对离散点电荷系在空间产生的场分布、静电场中导体的静电感应现象、静电场中电介质的极化现象等典型静电类电磁问题,利用Matlab中的偏微分方程工具箱(PDEtool)、数学物理方程进行可视化仿真实验设计.仿真结果中电场线、等势线的分布很好地体现出典型电磁现象及相关物理性质,有助于信息技术条件下的教学方法改革.  相似文献   

13.
This paper reports on an improvement of the filtration speed of charge injection type of electrostatic oil filter. Numerical simulations of the ion drag flow field and electric field are performed to compare the charge density distribution, ion drag flow pattern, and electric field strength distribution for different electrode and filter element shapes. Filtration experiments are conducted and the experimental results are discussed in relation to the simulation results. It is shown that the numerical simulations used in this study can contribute in predicting a better structure for electrostatic oil filters.  相似文献   

14.
通过分析峰值分布及广义极值分布理论关于混沌电场峰值分布的特点,获得一种混沌电场峰值分布的计算方法,结合Bootstrap重采样技术,提出了混沌电场峰值分布参数估计方法,该方法吸取了重采样技术估计的优点,对分布参数置信区间的估计更为准确、实用。以蒙特卡罗仿真和某机械搅拌混响室内电场数据为实例,结果表明,与传统的正态近似法、百分位法、BC-t等方法相比,其计算结果与实际结果更为吻合,证明了该方法具有更高的准确度。  相似文献   

15.
为了提升非链式DF激光器输出能量与电光转换效率, 使用有限元分析法, 分别计算了Chang氏电极和粗糙阴极与光滑阳极组成的平板电极间的静电场分布。对于Chang氏电极, 引入了火花针尖端强电场, 计算了火花针紫外预电离放电的电场分布。对于平板电极, 计算了阴极表面毛刺尖端的静电场分布, 发现毛刺会在阴极表面形成一系列较高强度的电场区域而不会导致平板电极间电场均匀性恶化。进而对两种电极进行了脉冲放电实验, 获得了非链式脉冲DF激光器的放电特性和输出参数。实验结果表明:均匀电场分布有利于提高非链式脉冲DF激光器的输出能量;自引发DF激光器阴极毛刺尖端强电场有利于实现体放电;自引发放电更适用于大体积均匀放电。  相似文献   

16.
A novel method is proposed for non-contact measurement of the distribution of electrostatic charge on a surface based on scanning the sample surface with a focused high frequency acoustic beam to excite movement of the sample surface. An electric field is induced by exciting a charged film-like object, and an electric field sensor measures it instead of an electrostatic field. The focused ultrasound waves are generated by controlling individually the phase of each 285 airborne ultrasound transducers.  相似文献   

17.
The Lekner method for calculation of electrostatic interactions in periodically replicated simulation cells is extended to quasi-two-dimensional systems of particles with dipolar interactions. The electric field, potential energy, forces and torques are expressed through rapidly converging series of modified Bessel functions. The method contains no arbitrary parameters, and has no limitations on the simulation box width.  相似文献   

18.
4-氯-2-三氟甲基噻吩并[3,2-D]嘧啶(4-chloro-2-(trifluoromethyl)thieno[3,2-d] pyrimidine, CTTP)分子具有很高的生物和医学活性,是重要的医药中间体,因此了解外电场下对其结构和光谱的影响具有重要意义。采用密度泛函理论B3LYP方法和def2-tzvp基组,优化计算了CTTP分子在不同外电场作用下的稳定结构;然后从外电场对其结构、原子电荷分布、前线轨道、静电势、红外和拉曼光谱等方面的影响进行了分析。结果显示:随着外电场强度增加,分子结构和原子电荷分布发生改变,分子极性增强,能隙降低,化学反应活性增强,静电势分布极值点发生了明显改变,红外和拉曼在不同区域内发生振动斯塔克效应,既有蓝移又有红移,峰的强度也出现了复杂的变化。  相似文献   

19.
A quantum-mechanical simulation is carried out to investigate the charge distribution and electrostatic potential along a 1 microm long (5,5) single-walled carbon nanotube under realistic field-emission experimental conditions. A single layer of carbon atoms is found sufficient to shield most of the electric field except at the tip where strong field penetration occurs. The penetration leads to a nonlinear decrease of potential barrier for emission, which is equally responsible for the low threshold voltage besides the well-known geometrical field enhancement factor.  相似文献   

20.
In this study, based on different numberical simulation methods, the gas-liquid two-phase flow is taken as the research object. By coupling the continuity equation of incompressible fluid, Navier-Stokes equation, electric field equation and other control equations, a multi-field coupling model for rising bubbles in viscous fluids is established, and numerical simulations are carried out. The two-phase popularity of coupled electric field is studied, and the effect of electric field on bubble motion is analyzed.The Level-set and phase field method are used to track the changes of deformation and rupture during the rising of the bubble. The accuracy and validity of the two methods are verified by mass conservation. At the same time, the calculation area is determined for the accuracy of calculation, and the optimal mesh size is calculated by using mesh independence test. Compared with the level set method, the phase field method has a certain improvement in the calculation efficiency and accuracy. Among them, the calculation efficiency of the phase field calculation method in the same grid is increased by 5 times, and by 3 times in the vertical electric field environment. Moreover, using the phase field method is easier to capture the bubbles slight changes while they are rising, and the quality of the simulation results is better.The simulation analysis of bubble rising process under coupled electric field by two methods shows that under the interaction of electrostatic force, buoyancy and surface tension, the bubble is stretched into an ellipsoid along the direction of the electric field line, and the ratio of the length to the short axis is proportional to the applied electric field strength. In addition, the bubble rising velocity is affected by the electric field, and the vertical electric field accelerates the rising of the bubble.  相似文献   

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