A new application for the transient hot-wire technique for thermal conductivity measurements has been described. It is intended to provide an accurate means of implementation of the method to the determination of the thermal conductivity of solids exemplified by a standard reference ceramic material. Measurements of the transient temperature allows an absolute determination of the thermal conductivity of the solid. The uncertainty achieved for the thermal conductivity is better than ±1%, ...
Author(s): Ahmad Gharleghi, Chia-Jyi Liu, Fei-Hung Lin, Yi-Hsuan Pai, Yu-Hsien Chu, Zong-Ren Yang
As technology advances, the need for inexpensive polymer-based composites possessing high thermal conductive properties has become more and more important. Previously, the addition of thermal conductive particles, such as alumina, boron nitride and alumina nitride, has caused an increase in the thermal conductivity of the composite. Although an increase in thermal conductivity is present, an increase in fabrication costs is also experienced as a higher quantity of particles is required, ...
Author(s): Chen-Chi M. Ma, Chih-Chun Teng, Chu-Hua Lu, Kuo-Chan Chiou, Min-Chien Hsiao, Ming-Yu Yen, Shie-Heng Lee, Shin-Yi Yang, Tzong-Ming Lee
The thermal conductivity of heat transfer nanofluids has been determined to increase by 10%, when containing metal oxide nanoparticles and carbon nanotubes. The fluid viscosity of the nanofluids is relatively the same as water, and therefore cannot not account for the increase in thermal conductivity. However, the fashion in which the metal oxide particles conglomerate within the fluid could be a potential explanation for the spike. Results show that under the ...
Author(s): B. Mannhalter, B. Wright, D. Thomas, H. Hong, J. Kellar, J. Wensel, P. Smith, W. Cross, W. Douglas, W. Roy
In mold fluxes, fluorine is generally added to reduce viscosity and solidification. The fluorine however, tends to cause corrosion of the casting machine and leads to environmental pollution. To potentially rid this design of these issues, researchers in this study examined the Fluorine-free mold flux, in a specific glass system. Properties such as viscosity, thermal conductivity and crystallization behaviour were all analyzed and compared to the values for the commercial ...
Author(s): Dong-Han Lee, Dong-Won Shin, Jong-Min Park, Jung-Wook Cho, Se-Young Choi, Soon-Yong Choi
Polystyrene (PS)/graphite thermal conductive nano-composites were prepared to verify the high thermal conductivity values with the addition of graphite, as well as the layered structure. The thermal conductivity of PS improved greatly in the presence of the graphite. Researchers used the Maxwell-Eucken model and the Agari model to evaluate thermal conductivity. For the purpose of improving the interfacial compatibility of PS/graphite, three PS fabrication methods were introduced to ...
Author(s): H. Tu, L. Ye
