Measurements of thermal conductivity and thermal diffusivity of alternative refrigerants in liquid phase with a transient short-hot-wire method

2004 ◽  
Vol 33 (8) ◽  
pp. 540-552 ◽  
Author(s):  
Toshio Tomimura ◽  
Syou Maki ◽  
Xing Zhang ◽  
Motoo Fujii
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Liquid Phase ◽  
Hot Wire ◽  
Alternative Refrigerants ◽  
Wire Method ◽  
Transient Short Hot Wire

Measurement of Effective Thermal Conductivity of CNT-Nanofluids by Transient Short-Wire Method

2009 ◽  
Author(s):  
Masamichi Kohno ◽  
Koichi Kimura ◽  
Shogo Moroe ◽  
Yasuyuki Takata ◽  
Peter L. Woodfield ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Effective Thermal Conductivity ◽  
Volume Fraction ◽  
Hot Wire ◽  
Wire Method ◽  
Different Shapes ◽  
Transient Short Hot Wire ◽  
Al2o3 Particles ◽  
Particle Shapes

Thermal conductivity and thermal diffusivity of CNT-nanofluids and Al2O3-nanofulids were measured by the transient short-hot-wire method. The uncertainty of their measurements is estimated to be within 1% for the thermal conductivity and 5% for the thermal diffusivity. Three different shapes of Al2O3 particles were prepared for Al2O3–water nanofluids. For the thermal conductivity of Al2O3-water nanofluids, there are differences in the enhancement of thermal conductivity for differences in particle shapes. Hardly any enhancement of thermal conductivity was observed for SWCNT-water nanofluids because the volume fraction of SWCNT was extremely low. However, we consider by increasing the volume fraction of SWCNTs, it will be possible to enhance the thermal conductivity.

Thermal Conductivity Measurement of Hydrogen at High Pressure and High Temperature

2011 ◽  
Author(s):  
Koichi Kimura ◽  
Shogo Moroe ◽  
Peter Woodfield ◽  
Jun Fukai ◽  
Kan’ei Shinzato ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
High Pressure ◽  
Pressure Range ◽  
Conductivity Measurement ◽  
Good Reproducibility ◽  
Hot Wire ◽  
Wire Method ◽  
Transient Short Hot Wire ◽  
Thermal Diffusivities ◽  
Thermal Conductivities

The thermal conductivities and thermal diffusivities of hydrogen were measured with a transient short hot wire method for temperature range up to 300 °C and pressure range up to 100MPa. The measured thermal conductivities showed good reproducibility and agreed with the existing values within a deviation of ±2%.

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