he effect of rotation on resonant frequency of Interfacial oscillation of a droplet using electrostatic levitator
he effect of rotation on resonant frequency of Interfacial oscillation of a droplet using electrostatic levitator
复制标题
使用静电悬浮器旋转对液滴界面振荡共振频率的影响
DOI：
10.1088/1742-6596/327/1/012021
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
A.Kaneko
中科院分区：
文献类型：
--
作者：
R.Tanaka;S.Matsumoto;A.Kaneko
在微重力环境下，由于失重，液体可以在没有容器的情况下处理。因此，需要高精度地测量材料的物理性能。在悬浮液滴表面张力测量中，采用在共振频率线性假设下推导的公式进行计算。然而，研究表明，液滴的共振频率由于振动和旋转而发生变化。而频率漂移的机理目前还没有被揭示。本研究的最终目的是为了弄清频移的机制。利用静电悬浮器将液滴悬浮起来，并诱导液滴振荡和旋转。根据液滴的运动测量了共振频率、振幅、角速度和纵横比。证实了振动和转动对共振频率的影响。在适当的幅值和角速度组合下，频移为零。实验表明，谐振频率与长宽比的时间平均值有很强的相关性。
Under the microgravity environment, liquid can be treated without container due to weightlessness. Therefore physical properties of a material are expected to be measured with a high accuracy. In surface tension measurement of levitated droplet, it is calculated by using the formula derived under the assumption of linearity of the resonant frequency. However, it is indicated that the resonant frequency of a droplet changes due to oscillation and rotation. And mechanism of frequency shift has not been revealed yet. The final goal of this study is to make clear the mechanism of frequency shift. A droplet is levitated by using electrostatic levitator, and induced to oscillate and rotate. Resonant frequency, amplitude, angular velocity and aspect ratio are measured from droplet motion. It is confirmed oscillation and rotation effect on resonant frequency. And the frequency shift becomes zero under the appropriate combination of amplitude and angular velocity. It is experimentally clarified that the resonant frequency is strongly related with time average of aspect ratio.