Study of thermal conductivity close to the melting point

Golyshev, V. D.; Гоник, М. А.; Tsvetovsky, V. B.

doi:10.1068/htjr106

Cited by 17 publications

(22 citation statements)

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“…2, were tested with the use of materials which are considered to be reference standards for measuring the thermal conductivity under RCT conditions. Data for NaCl [7] show that 10 % uncertainty is achievable with the current setup. The results of analyzing thermal conductivity of bismuth germanate and bismuth silicates are presented in Fig.…”

Section: Thermal Conductivity Of Crystals and Meltsmentioning

confidence: 76%

“…2.1 arises due to the presence of a thermal contact resistance, R, between the thermocouples and the samples and, consequently, is caused by the error in the measured temperature drop, T , on the sample. Research carried out in [7] showed that the error of T may reach (15 to 20) %, and it strongly depends on the value of the load on the samples. A load of more than 25 kg was found not to lead to a change in the temperature drop; therefore, all further measurements were carried out with such a load.…”

Section: Role Of Contact Resistancementioning

confidence: 98%

“…Nevertheless, the total error of the measurements was successfully reduced because the contact resistance of the assembly with the nickel disks appeared to be 40 % less than that with the platinum disks. To improve the accuracy of the determination of the thermal conductivity of the samples, measurements of the contact resistance of the assembly itself [7] were carried out, when ∼0.2 mm thick disks of Ni were used in place of the studied crystals. Data obtained for R are given in Table 1.…”

Section: Role Of Contact Resistancementioning

confidence: 99%

“…A load of more than 25 kg was found not to lead to a change in the temperature drop; therefore, all further measurements were carried out with such a load. Since disk processing has a significant influence on the results [7], the measuring and platinum disks were polished. For measurements of the thermal conductivity of sillenits Bi 12 SiO 20 and Bi 12 GeO 20 (bismuth silicate and germanate), platinum disks were replaced by nickel disks 0.5 mm thick.…”

Section: Role Of Contact Resistancementioning

confidence: 99%

“…In this work the method for measuring the thermal conductivity of matter close to the melting point, proposed earlier by the authors [6,7], will be used.…”

Section: Introductionmentioning

confidence: 99%

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Spectral Absorptivity and Thermal Conductivity of BGO and BSO Melts and Single Crystals

2008

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The present work describes the results of spectral absorptivity, α, and thermal conductivity, λ, studies for compound oxides SiO 20 in molten and monocrystalline states. The data for the spectral absorptivity were obtained by placing the sample onto a mirror and using the transmission method. To obtain the data on the thermal conductivity of crystals, the stationary method of two identical samples was used. The data for the thermal conductivity of melts were obtained by a new stationary relative method in which the thermal conductivity of the crystal is used as a reference. Special attention is focused on numerical and experimental error analysis at high temperature. The studies have shown that α in the range of a transmission band strongly depends on crystal purity. It varies from 0.0005 cm −1 to 0.03 cm −1 for Bi 4 Ge 3 O 12 and reaches 0.15 cm −1 for Bi 4 Si 3 O 12 . It was found that α is significantly greater for melts than for crystals, reaching (150 to 200) cm −1 for the Bi 4 Ge 3 O 12 melt. The thermal conductivity of the melts under investigation was found to be much smaller than that of the corresponding crystals.

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Section: Thermal Conductivity Of Crystals and Meltsmentioning

confidence: 76%

Section: Role Of Contact Resistancementioning

confidence: 98%

Section: Role Of Contact Resistancementioning

confidence: 99%

Section: Role Of Contact Resistancementioning

confidence: 99%

“…In this work the method for measuring the thermal conductivity of matter close to the melting point, proposed earlier by the authors [6,7], will be used.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations