Laser flash method for measuring thermal conductivity of liquids—application to low thermal conductivity liquids

1978 ◽  
Vol 49 (9) ◽  
pp. 1305-1314 ◽  
Author(s):  
Yutaka Tada ◽  
Makoto Harada ◽  
Masataka Tanigaki ◽  
Wataru Eguchi
Keyword(s):  
Thermal Conductivity ◽  
Laser Flash ◽  
Laser Flash Method ◽  
Flash Method ◽  
Low Thermal Conductivity

Laser flash method for measuring thermal conductivity of liquids. Application to molten salts

1981 ◽  
Vol 20 (4) ◽  
pp. 333-336 ◽  
Author(s):  
Yutaka Tada ◽  
Makoto Harada ◽  
Masataka Tanigaki ◽  
Wataru Eguchi
Keyword(s):  
Thermal Conductivity ◽  
Molten Salts ◽  
Laser Flash ◽  
Laser Flash Method ◽  
Flash Method

Thermoelectric Properties of Phase Separated Composite of Ln-Doped SrTiO3 and TiO2 Micro Crystals

2007 ◽  
Vol 1044 ◽  
Author(s):  
Kiyoshi Fuda ◽  
Kenji Murakami ◽  
Shigeaki Sugiyama
Keyword(s):  
Thermal Conductivity ◽  
High Performance ◽  
Fine Particles ◽  
Bulk Material ◽  
Laser Flash ◽  
Flash Method ◽  
Helium Atmosphere ◽  
Low Thermal Conductivity ◽  
Seebeck Coefficients ◽  
Thermal Diffusivities

AbstractIt seems that no satisfactory TE property has been found in n-type oxide bulk materials even though Al-doped ZnO and La-doped SrTiO3 have high thermoelectric (TE) responses. Difficulty in developing high-performance TE materials seems to lie in finding low thermal conductivity in such oxides. The purpose of this study is to find a possibility to make an n-type TE oxide bulk material having low thermal conductivity and excellent TE properties as well. For this purpose, we fabricated and examined a series of composites constructed of TiO2 and Ln-doped SrTiO3 fine crystals. The composites were prepared via two processing steps: (1) precursor oxide preparation by wet processes; (2) sintering by using spark plasma sintering (SPS) apparatus. The microscopic structure was examined by using scanning electron microscope (SEM; HITACHI S-4500 model) attached with an energy dispersive x-ray spectroscopy. The electrical conductivities and the Seebeck coefficients were measured simultaneously using an ULVAC ZEM-1 instrument in helium atmosphere. The thermal diffusivities were measured by a laser flash method in vacuum. The composites obtained here were found to commonly have a mosaic type texture constructed of TiO2 and SrTiO3 fine particles with a typical size of 500 nm. The thermal conductivity values measured for three samples with different contents are ranged between 3 and 4 Wm-1K-1 in the temperature range from room temperature to 800 C. The values are apparently lower than the value for single crystal SrTiO3 samples presented in literature. Taking account the other TE data, e.g. Seebeck coefficient and electrical conductivity, we calculated dimensionless figure of merit, ZT, to be at maximum 0.15 at 800°C.

scholarly journals Determination of Thermal Conductivity of Slag Melts by means of Modified Laser Flash Method

1982 ◽  
Vol 46 (12) ◽  
pp. 1131-1138 ◽  
Author(s):  
Toshikazu Sakuraya ◽  
Toshihiko Emi ◽  
Hiromichi Ohta ◽  
Yoshio Waseda
Keyword(s):  
Thermal Conductivity ◽  
Laser Flash ◽  
Laser Flash Method ◽  
Flash Method ◽  
Slag Melts

Determination of the thermal conductivity of nickel - zirconia cermets by a laser-flash method

1999 ◽  
Vol 31 (5) ◽  
pp. 535-542 ◽  
Author(s):  
Wangyu Hu ◽  
Hengrong Guan ◽  
Xiaofeng Sun ◽  
Shizhuo Li
Keyword(s):  
Thermal Conductivity ◽  
Laser Flash ◽  
Laser Flash Method ◽  
Flash Method

Thermal conductivity of EB-PVD ZrO2–4mol% Y2O3 films using the laser flash method

2011 ◽  
Vol 509 (3) ◽  
pp. 1045-1049 ◽  
Author(s):  
Byung-Koog Jang ◽  
Yoshio Sakka ◽  
Norio Yamaguchi ◽  
Hideaki Matsubara ◽  
Hyung-Tae Kim
Keyword(s):  
Thermal Conductivity ◽  
Laser Flash ◽  
Laser Flash Method ◽  
Flash Method

Improvement of Thermal Conductivity of Silicone by Carbon Nanotube Array (CNTA)

2014 ◽  
Vol 1061-1062 ◽  
pp. 96-99 ◽  
Author(s):  
Liang Ke Wu ◽  
Ji Ying ◽  
Li Ting Chen
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
Laser Flash ◽  
Laser Flash Method ◽  
Thermal Interface Material ◽  
Flash Method ◽  
Nanotube Array ◽  
Thermal Interface ◽  
Carbon Nanotube Array ◽  
Operating Temperatures

In order to improve the thermal conductivity of silicone, we prepared silicone/carbon nanotube array (CNTA) composite by immersing the CNTA into silicone solution and cured at 110 °C. The thermal conductivity of silicone and silicone/CNTA composite was measured by laser flash method at 30 °C, 60 °C, 90 °C, 120 °C, which are usually the operating temperatures. It was found that the thermal conductivity of silicone/CNTA composite increased with the temperature until achieved the plateau near 90 °C. The maximum thermal conductivity of silicone/CNTA composite is 0.674 W/mK, which is 220% higher than that of neat silicone. The excellent thermal conductivity makes the composite a promising thermal interface material.

Laser Flash Measurement of Samples With a Transparent Reference Layer

2009 ◽  
Author(s):  
Heng Ban ◽  
Zilong Hua
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Thermal Diffusivity ◽  
Temperature Response ◽  
Front Surface ◽  
Laser Flash ◽  
Laser Flash Method ◽  
Flash Method ◽  
Thermal Diffusivity Measurement ◽  
Reference Layer

The laser flash method is a standard method for thermal diffusivity measurement. This paper reports the development of a method and theory that extends the standard laser flash method to measure thermal conductivity and thermal diffusivity simultaneously. By attaching a transparent reference layer with known thermal properties on the back of a sample, the thermal conductivity and thermal diffusivity of the sample can be extracted from the temperature response of the interface between the sample and the reference layer to a heating pulse on the front surface. The theory can be applied for sample and reference layer with different thermal properties and thickness, and the original analysis of the laser flash method becomes a limiting case of the current theory with an infinitely small thickness of the reference layer. The uncertainty analysis was performed and results indicated that the laser flash method can be used to extract the thermal conductivity and diffusivity of the sample. The results can be applied to, for instance, opaque liquid in a quartz dish with silicon infrared detector measuring the temperature of liquid-quartz interface through the quartz.

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