Thermal Conductivities of Complex Liquids Relevant to Process Modelling

与过程建模相关的复杂液体的热导率

• 批准号: 11650758
• 负责人: SUSA Masahiro
• 金额: $ 2.3万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650758/
• 关键词: process modelling; complex liquid; thermal conductivity; nonstationary hot wire method; molten metal; molten glass containing fluoride; Wiedemann-Franz law; electronic specific heat; 液体金属; 融解半導体; 溶融ガラス

The aim of this project was to measure thermal conductivities of metal, semiconductor and oxide melts relevant to process modelling and to discuss thermal conduction mechanisms in the metls.1. Development of a new method for measuring thermal conductivity of metal and semiconductor meltsThe nonstationary hot wire method with an insulator-coated probe has been developed to measure thermal conductivities for molten metals. Values measures on Hg and molten Pb are 8.2 W/mK at room temperature and 15 W/mK at 573 K, respectively, and are in good agreement with corresponding published values.2. Thermal conductivity of molten Sn and Sn-In alloysThe thermal conductivity measured on Sn is 28 W/mK at 600K and increases slightly with an increase in temperature. Additions of In result in a decrease in the thermal conductivity and its temperature dependence.3. Applicability of the Wiedemann-Franz law to metals at high temperatureThe Wiedemann-Franz law was derived using specific heat of free electro … More n. A new equation has been proposed to estimate thermal conductivity of metals at high temperature from electrical conductivity and electronic specific heat, the latter being calculated using the electron density of states for actual metals.4. Thermal conductivity of molten SiThe measured value is 57 W/mK at 1700 K and increases slightly with an increase in temperature. The value measured on solid Si is 19 W/mK at 1673 K just below the melting point. It has been found that the thermal conductivity of Si increases drastically on melting.5. Thermal conductivity of alkali silicate glass meltsThermal conductivities of Li_2O-SiO_2, Na_2O-SiO_2 and K_2O-SiO_2 melts were measured using the nonstationary hot wire method. The thermal conductivity decreases as the radius of alkali metals becomes larger. It has been condcluded that the thermal conductivity becomes smaller as the chemical bond between alkali and nonbridging oxygen ions is more ionic.6. Effect of fluoride additions to thermal conductivity of alkali silicate glass meltsMeasurements were carried out on Li_2O-SiO_2 and Na_2O-SiO_2 melts contained LiF and NaF, respectively. In both systems the thermal conductivities decrease with additions of the fluorides. This decrease would be due to breaking of the network structure of silicates by fluorine. Less

该项目的目的是测量与工艺建模相关的金属、半导体和氧化物熔体的热导率，并讨论 metls.1 中的热传导机制。开发测量金​​属和半导体熔体热导率的新方法采用绝缘体涂层探头的非固定热线法已开发用于测量熔融金属的热导率。 Hg 和熔融 Pb 的测量值在室温下分别为 8.2 W/mK，在 573 K 下为 15 W/mK，与相应的公布值非常一致。2．熔融 Sn 和 Sn-In 合金的热导率在 600K 时测得 Sn 的热导率为 28 W/mK，并随着温度的升高而略有增加。 In的添加导致热导率及其温度依赖性降低。3．维德曼-弗朗兹定律对高温金属的适用性维德曼-弗朗兹定律是利用自由电子的比热推导出来的。提出了一个新的方程，根据电导率和电子比热估计高温下金属的热导率，后者是使用实际金属的电子态密度计算的。4．熔融Si的热导率在1700 K时测量值为57 W/mK，并随着温度的升高而略有增加。在略低于熔点的 1673 K 条件下，在固体 Si 上测得的值为 19 W/mK。研究发现，Si在熔化时热导率急剧增加。5．碱金属硅酸盐玻璃熔体的热导率采用非稳态热丝法测量了Li_2O-SiO_2、Na_2O-SiO_2和K_2O-SiO_2熔体的热导率。随着碱金属半径变大，热导率降低。结果表明，碱金属与非桥氧离子之间的化学键离子性越大，热导率越小。6．氟化物添加量对碱硅酸盐玻璃熔体导热系数的影响分别对含LiF和NaF的Li_2O-SiO_2和Na_2O-SiO_2熔体进行了测量。在这两个系统中，热导率随着氟化物的添加而降低。这种减少可能是由于氟破坏了硅酸盐的网络结构。较少的

项目成果

E Yamasue et al: "Nonstationary Hot Wire Method with Silica-Coated Probe for Measuring Thermal Conductivities of Molten Metals"Metall.Mater.Trans.A. Vol.30A, August. 1971-1979 (2000)

E Yamasue 等人：“使用二氧化硅涂层探针测量熔融金属热导率的非稳态热丝法”Metall.Mater.Trans.A。

Hiroyuki Fukuyama: "Challerge to Thermal Conductivity Measurement of Liquid Silicon under Microgravity"Thermophysical Properties. 20. 280-283 (1999)

Hiroyuki Fukuyama：“微重力下液态硅热导率测量的挑战”热物理性质。

E Yamasue 他: "Nonstationary Hot Wire Method with Silica-Coated Probe for Measuring Thermal Conductivities of Molten Metals"Metallurgical and Materials Transactions A. 30A・Aug. 1971-1979 (1999)

E Yamasue 等人：“用二氧化硅涂层探针测量熔融金属热导率的非稳态热丝法”Metallurgical and Materials Transactions A. 30A・Aug 1971-1979 (1999)

H Fukuyama 他: "Challenge to Thermal Conductivity Measurement of Liquid Silicon under Microgravity"Thermophysical Properties. 20. 280-283 (1999)

H Fukuyama 等人：“微重力下液态硅热导率测量的挑战”热物理性质。20. 280-283 (1999)

M Hayashi 他: "Effect of ionicity of non-bridging oxygen ions on thermal conductivity of molten alkali silicates"Physics and Chemistry of Glasses. 42・1. 6-11 (2001)

M Hayashi等人：“非桥接氧离子的离子性对熔融碱金属硅酸盐导热性的影响”，玻璃物理和化学42・1（2001）。