摩擦电效应
无量纲量
电介质
半径
材料科学
球体
纳米发生器
介电常数
平方(代数)
光学
电极
球谐函数
欧姆接触
物理
电压
几何学
光电子学
机械
复合材料
量子力学
天文
数学
计算机科学
计算机安全
作者
Jens Gravesen,Morten Willatzen,Jiajia Shao,Zhong Lin Wang
标识
DOI:10.1002/adfm.202110516
摘要
Abstract A general theoretical analysis of a 3D generic TENG structure is presented. Using a dimensionless formulation, it is demonstrated that the optimal TENG geometry does not depend on the frequency of the moving dielectric but the external ohmic impedance for maximum power output is inversely proportional to the frequency. It is also found that the energy is proportional to the cube of the size of the TENG, the square of the triboelectric charge density σ T , and the angular frequency ω of the moving dielectric. In the case of a spherical TENG where the moving dielectric is a sphere and the electrodes are spherical caps on a larger sphere three dimensionless parameters that determine the harvested energy are identified: the ratio between the radii of the two spheres = r/R, the polar angle θ of the two spherical caps formed by the electrodes, and = ZεRω, where Z is the external impedance, R is the radius of the large sphere, ε is the permittivity of the system, and ω is the angular frequency of the moving sphere. Under the crude assumption of constant charge density on the electrodes, the optimal parameters can be easily calculated. It is found that θ = 1.1 rad, = 0.67, and = 0.18.
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