Development of an Apparatus for Measuring Thermal Conductivity of Liquids with a Transient Short-Hot-Wire Method.

开发一种用瞬态短热线法测量液体热导率的装置。

• 批准号: 07555388
• 负责人: FUJII Motoo
• 金额: $ 1.41万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555388/
• 关键词: Short-hot-wire method; Thermal conductivity; Thermal diffusivity; Carbonate; Insulating film; Sputtering apparatus; 非定常短細線法; 流体熱物性; 絶縁被覆

The aim of present study is to develop a practical apparatus for measuring the thermal conductivity and diffusivity of liquids based on a new transient short-hot-wire method. The main results during the research period are as follows :1. From high accurate numerical solutions of two dimensional unsteady heat-conduction for wide range of parameters corresponding to various liquids around a short-hot-wire heat source, the basic correlations for the wire mean temperature evolutions on which the present method is based were obtained.2. To confirm the effects of aspect ratio (length/diameter), coating material and its thickness on the measurement accuracy, several sample liquids with known thermophysical properties were measured. The results reveal that the present method can determine both the thermal conductivity and thermal diffusivity within the error of 2 and 5%, respectively.3. By using a sputtering apparatus under various conditions of vacuum pressure, carrier gas flow rate and oxyge … More n concentration, the optimum conditions to make an insulating and anticorrosive coating film of pure Al_2O_3 on the wire were investigated and determined.4. The qualities of the coated probe were investigated such as electrical insulating, heat-resisting, anticorrosive characteristics and durability, by measuring a molten carbonate as an electro-conductive and corrosive liquid at high temperature. The results reveal that (a) the durability of insulating layr is greatly affected with the ratio of wire diameter to film thickness ; (b) it is possible to make a good insulating film for the wire diameter about 100 mum ; and (c) micro-crack of the film results in corrosive reaction of platinum wire.5. With a probe having a good insulating film, the thermal conductivity and thermal diffusivity for molten carbonate could be measured within the above accuracy and with good reproducibility.6. A measurement sequence program was modified and improved. A simple procedure was developed for a practical measurement. Less

本研究的目的是开发一种实用的装置，用于测量液体的导热系数和扩散率的基础上一个新的瞬态短热线方法。研究期间取得的主要成果如下：1.从二维非稳态热传导的高精度数值解中得到了各种液体在短热线热源周围的宽参数范围内的数值解，得到了该方法所依据的热线平均温度演化的基本关联式.为了确认纵横比（长度/直径），涂层材料及其厚度对测量精度的影响，测量了具有已知热物理性质的几种样品液体。结果表明，该方法可以同时确定导热系数和热扩散系数，误差分别在2%和5%以内.通过使用溅射设备在不同的真空压力、载气流量和氧气流量条件下， ...更多信息 n浓度，研究并确定了在导线上制备纯Al_2O_3绝缘防腐涂层的最佳工艺条件.通过测量高温导电腐蚀性液体熔融碳酸盐，研究了涂层探头的电绝缘性、耐热性、防腐蚀性和耐久性等性能。结果表明：（a）绝缘层的耐久性受丝径与膜厚比的影响很大;（B）丝径在100 μ m左右时可以制得良好的绝缘膜;（c）膜的微裂纹导致铂丝发生腐蚀反应.采用具有良好绝缘膜的探头，可以在上述精度范围内测量熔融碳酸盐的热导率和热扩散率，并具有良好的重现性.对测量顺序程序进行了修改和完善。为实际测量开发了一个简单的程序。少

项目成果

M.Fujii, X.Zhang and N.Imaishi: "Measurements of Thermophysical Properties Under Microgravity Condition." Proc.of the International Seminar on Manufacturing of Advanced Materials-Chemistry and Process Analysis-. 42-45 (1995)

M.Fujii、X.Zhang 和 N.Imaishi：“微重力条件下热物理性质的测量”。

M.Fujii, X.Zhang, N.Imaishi, S.Fujiwara, and T.Sakamoto: "Simultaneous Measurements of Thermal Conductivity and Thermal Diffusivity of Liquids Under Microgravity Conditions." International Journal of Thermophysics. Vol.18, No.2. 327-339 (1997)

M.Fujii、X.Zhang、N.Imaishi、S.Fujiwara 和 T.Sakamoto：“微重力条件下液体导热率和热扩散率的同时测量”。

M.Fujii, X.Zhang, N.Imaishi, S.Fujiwara, and T.Sakamoto: "Simultaneous Measurements of Thermal Conductivity and Diffusivity of Liquids Under Micro-Gravity Condition." Proc.of the 4th Asian Thermophysical Properties Conference. Vol.1. 97-100 (1995)

M.Fujii、X.Zhang、N.Imaishi、S.Fujiwara 和 T.Sakamoto：“微重力条件下液体导热率和扩散率的同时测量”。

M.Fuji,X.Zang,N.Imaishi,S.Fujiwara,and T.Sakamoto: "Simultaneous Measurement of Themal Conductivity and Thermal Deffusivity of Liquids Under Microgravity Conditions" International Journal of Thermophysics. 18(2). 327-339 (1997)

M.Fuji、X.Zang、N.Imaishi、S.Fujiwara 和 T.Sakamoto：“微重力条件下液体的热导率和热扩散率的同时测量”国际热物理学杂志。

Motoo Fujii: "Simultaneous Measurements of Thermal Conductivity and Diffusivity of Liquids under Micro-gravity Condition" Proceedings of 4th Asian Thermophysical Properties Conference. 1. 97-100 (1995)

Motoo Fujii：“微重力条件下液体导热率和扩散率的同时测量”第四届亚洲热物理性质会议论文集。