EDB中微米单颗粒振荡特性  

OSCILLATION CHARACTERISTICS OF SINGLE MICROPARTICLE IN ELECTRODYNAMIC BALANCE

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作  者:冯昭华[1] 朱家骅[1] 杨雪峰[1] 夏素兰[1] 关国强[1] Davis E.J 

机构地区:[1]四川大学化学工程学院,四川成都610065 [2]华盛顿大学化工系

出  处:《化工学报》2004年第6期902-906,共5页CIESC Journal

基  金:国家自然科学基金资助项目 (No 2 98760 2 2 );国家教育部博士点基金资助项目 (No 2 0 0 10 610 0 2 7)~~

摘  要:改进了Davis关于微米单颗粒在EDB(electrodynamicbalance)中悬浮的两区理论 ,通过引入Oseen曳力公式和非齐次项 ,建立了振荡条件下颗粒完整的运动微分方程 ,并对其运动轨迹进行了数值模拟 .从理论上证实了颗粒在EDB中存在稳定的阻尼振荡过渡区 ,给出了不同于Davis理论的三区状态图 (δ β图 ) ,从而构建了振荡条件下颗粒EDB研究的理论基础 .这些理论结果的可靠性通过实验也得到了很好的验证 .Based on the two-regime theory of Davis, a complete motion differential equation for a single oscillating microparticle in an electrodynamic balance (EDB) has been put forward by introducing Oseen's formula and inhomogeneous term and solved numerically by using the classic Runge-Kutta method. The fact that there exists a transitional regime, in which the charged particle can be in steady damped oscillation, was demonstrated by theoretical method. By virtue of the simulated trajectories, a three-regime state curve (δ/β), which is different from Davis theory, was delineated and the theoretical foundation of EDB research on microparticle oscillation was further built up. And the above-mentioned theoretical results were verified experimentally hereby.

关 键 词:EDB 微米单颗粒 振荡特性 运动轨迹 数值模拟 

分 类 号:O359[理学—流体力学]

 

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