Gas viscosity measurement with diamagnetic-levitation viscometer based on electromagnetically spinning system
Gas viscosity measurement with diamagnetic-levitation viscometer based on electromagnetically spinning system
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基于电磁旋转系统的反磁悬浮粘度计测量气体粘度
DOI：
10.1016/j.ijthermalsci.2016.01.021
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发表时间：
2016
影响因子：
4.5
通讯作者：
S. Mitani and K. Sakai
中科院分区：
文献类型：
--
作者：
T. Koga;S. Mitani and K. Sakai
利用涟漪子谱，我们观察到了具有温度梯度的非均匀状态下液面位移的动态结构因子。通过对由散射光和参考光混合产生的光学拍频信号进行锁定检测，大大提高了该光散射实验的灵敏度。我们还可以通过在表面上扩展一个不溶于水的单分子层来抑制由于温度梯度引起的Marangoni流，并建立一个机械稳定的水面，即使在温度梯度下也是如此。观测到的表面位移的动态结构因子--波纹谱的不对称性与我们描述结构因子不对称性的公式非常一致。
Using ripplon spectroscopy, we observed the dynamic structure factor of liquid-surface displacement in a non-uniform state with a temperature gradient. The sensitivity of this light-scattering experiment has been considerably improved by employing lock-in detection of the optical beating signal, which is generated by the mixing of the scattered and reference light. We may also suppress the Marangoni flow due to the temperature gradient by expanding an insoluble monomolecular layer on the surface and to establish a mechanically stable water surface, even under a temperature gradient. The observed asymmetry of the ripplon spectrum, which is the dynamic structure factor of the surface displacement, is in quite good agreement with our formula describing the asymmetry of the structure factor.