MEASUREMENT OF THERMOPHYSICAL PROPERTIES OF SOLID BODIES AT LOW TEMPERATURE REGION OF LIQUID HELIUM

液氦低温区固体热物理性质的测量

基本信息

批准号：
63850047
负责人：
ITO Takehiro
金额：
$ 4.22万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63850047/
关键词：
Thermophysical Property Transient Heat Conduction Low Temperature Rectangular-shaped Pulse Heating Liquid Helium Specific Heat Thermal Conductivity Thermal Diffusivity ヘリウム温度域

项目摘要

One of the information that has been in great demand in thermal design of the cryogenic devices is that of the thermophysical properties such as the specific heat, the thermal conductivity and the thermal diffusivity. Therefore, it is of definite importance to develop a handy method for measuring such properties to construct a large body of database. Thus, a transient method with rectangular-shaped pulse heating has been developed to determine the thermophysical properties of substances used often as structural materials at low temperature region of liquid helium. Those tested were Bakelite (Phenolformaldehyde resin) and Teflon (Polytetra-fluoroetliylene) in the temperature ranges of 4.44-9.15[K] and 4.73-15.62[K], respectively. The further studies for numerical method were made and the present analytical method was verified.It was recognized in the temperature range tested that the specific heat and the thermal conductivity of them increased with temperature, while the thermal diffusivity decreased with that. Results indicated also that the specific heat of Bakelite varnish and Teflon as well as the thermal conductivity of Teflon reported behaved similarly to our present results. Thus the validity of the present transient method was confirmed. It was found as well that the temperature excursion of solid bodies could be predicted by the numerical method.

低温设备热设计需求的信息之一是热物理特性（例如特定热，热导率和热扩散率）的信息。因此，开发一种方便的方法来衡量构建大量数据库的特性是非常重要的。因此，已经开发了一种具有矩形脉冲加热的瞬态方法，以确定经常用作液体氦低温区域的结构材料的物质的热物理特性。测试的这些分别为4.44-9.15 [k]和4.73-15.62 [k]，在温度范围内分别为Bakelite（苯甲醛树脂）和Teflon（Polytetra-fluoroetliylene）。对数值方法进行了进一步的研究，并验证了当前的分析方法。在温度范围内确认了它的特定热量和它们的导热率随温度而增加，而热扩散率随着温度而降低。结果还表明，肉饼清漆和特氟龙的比热以及报道的特氟龙的导热率与我们目前的结果相似。因此，确认了当前瞬态方法的有效性。还发现，可以通过数值方法预测固体的温度游览。