Thermophysical Properties of Molten Silicon

熔融硅的热物理性质

• 批准号: 12450091
• 负责人: NAGASAKA Yuji
• 金额: $ 6.34万
• 依托单位: Keio University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450091/
• 关键词: Thermophysical Properties; Measurement Techniques; Foods; Viscosity; Surface Tension

A new experimental apparatus based on the laser induced capillary wave technique by using pulsed CO_2 laser (wavelength: 10.6 μm, pulse width: 50 ns, output energy: 65 mJ) as a heating source has been developed. In this method, pulsed two high-power laser beams intersect on a sample surface and they generate spatially sinusoidal temperature distribution. The temperature distribution of the thermal grating creates capillary wave on the surface by the thermal expansion (the amplitude of the wave is about 10 nm). The capillary wave is detected by a diffracted probe beam at the heated area on the surface.The results obtained from the present research are summarized as follows.1. We have developed a new experimental apparatus by using pulsed CO_2 laser and established experimental techniques to detect a stable signal with this apparatus.2. The signal from low viscosity materials such as toluene showed the damping oscillation. In the case of high viscosity materials such as glycerol, we detected the overdamped wave. The application of laser induced capillary wave method has considerable potential for the measurement of wide viscosity range.3. Detected signal from toluene was very well in agreement with theoretically calculated wave forms considering the temperature dependence of surface tension.

以脉冲CO2激光（波长：10.6 μm，脉宽：50 ns，输出能量：65 mJ）为热源，研制了一种基于激光诱导毛细波技术的新型实验装置。在该方法中，两束高功率脉冲激光束在样品表面相交，产生空间正弦温度分布。热光栅的温度分布在热膨胀的作用下在表面产生毛细波（振幅约为10 nm）。在表面加热区用衍射探测光探测毛细波，得到了以下结果.我们研制了一种新型的脉冲CO_2激光器实验装置，并建立了利用该装置探测稳定信号的实验技术.来自低粘度材料如甲苯的信号显示出阻尼振荡。在甘油等高粘度材料的情况下，我们检测到过阻尼波。激光诱导毛细波法在宽粘度范围的测量中具有很大的应用潜力.从甲苯中检测到的信号与考虑表面张力的温度依赖性的理论计算的波形非常一致。

项目成果

Yoshihiko Kido: "Development of laser induced capillary wave technique for viscosity measurement using pulsed CO_2 laser"Proceedings of The Sixth Asian Thermophysical Properties Conference. 6. 411-416 (2001)

Yoshihiko Kido：“使用脉冲CO_2激光进行粘度测量的激光诱导毛细波技术的发展”第六届亚洲热物理性质会议论文集。

長坂雄次: "光学測定と熱物性(伝熱工学の進展第3巻)"養賢堂. 126 (2000)

Yuji Nagasaka：“光学测量和热物理性质（传热工程进展第 3 卷）” Yokendo 126（2000）。

Kido, Y.: "Development of laser induced capillary wave technique for viscosity measurement using pulsed C0_2 laser"Proc. 6th Asian Thermophysical Properties Conference. 411-416 (2001)

Kido, Y.：“使用脉冲 CO_2 激光进行粘度测量的激光诱导毛细波技术的开发”Proc。

木戸 良彦: "レーザー誘起表面波による粘性率測定に関する研究(第4報表面波発生のメカニズム)"第39回日本伝熱シンポジウム講演論文集. 39(発表予定). (2002)

Yoshihiko Kido：“利用激光诱导表面波进行粘度测量的研究（第四次报告：表面波产生的机制）”第 39 届日本传热研讨会论文集（待发表）。

木戸良彦: "レーザ誘起表面波による粘性率測定に関する研究(第3報パルスCO_2レーザを用いた実験装置の開発)"第38回日本伝熱シンポジウム講演論文集. 38(発表予定). (2001)

Yoshihiko Kido：“利用激光诱导表面波进行粘度测量的研究（第3部分：使用脉冲CO_2激光的实验设备的开发）”第38届日本传热研讨会论文集（待发表）。