Measurement of In-Plane Thermal Conductivity of Ultrathin Films Using Micro-Raman Spectroscopy Zhe Luo, Han Liu, Bryan T. Spann, Yanhui Feng, Peide Ye, Yong P. Chen & Xianfan Xu a School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana b School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University, West Laf...

A coupled molecular dynamics (MD)-stochastic model has been developed for predicting the thermal conductivity of a hypothetical water based Zn-nanofluid taking into account the heat transfer during and after collision of the nanoparticles with the heat source. The model has predicted a somewhat lower enhancement in thermal conductivity of water based Zn-nanofluid compared to water based Cu-nano...

The thermal conductivity of three mixtures of nitrogen and cyclopentane is measured using a transient hot wire method, at temperatures between 315.14 and 395.89K, and pressures up to 0.53MPa. These mixtures are important in the evaluation of the evolution of the thermal insulation capacity of closed-cell polyurethane foams considering their aging during the respective applications’ total life t...

In this paper an inverse problem for the space fractional heat conduction equation is investigated. Firstly, we describe the approximate solution of the direct problem. Secondly, for the inverse problem part, we define the functional illustrating the error of approximate solution. To recover the thermal conductivity coefficient we need to minimize this functional. In order to minimize this func...

Several trillion cigarettes produced worldwide annually lead to many thousands of kilograms of toxic waste. Cigarette butts (CBs) accumulate in the environment due to the poor biodegradability of the cellulose acetate filters. This paper presents some of the results from a continuing study on recycling CBs into fired clay bricks. Physico-mechanical properties of fired clay bricks manufactured w...

Bi2Te3 thermoelectric materials are utilized for refrigeration for decades, while their application of energy harvesting requires stable thermoelectric and mechanical performances at elevated temperatures. This work reveals that a steady zT of ≈0.85 at 200 to 300 °C can be achieved by doping small amounts of copper iodide (CuI) in Bi2Te2.2Se0.8-silicon carbide (SiC) composites, where SiC nanodi...

Ceramic oxides that have high-temperature capabilities can be deposited on the superalloy components in aero engines and diesel engines to advance engine efficiency and reduce fuel consumption. This paper aims to study doping effects of Dy(3+) and Y(3+)on the thermodynamic properties of ZrO2 synthesized via a sol-gel route for a better control of the stoichiometry, combined with molecular dynam...

The thermal conductivity of a solid thin film was investigated by using two nonequilibrium molecular dynamics (NEMD) methods and changing the calculation conditions. Solid argon was selected as a target material because it has a typical Lennard-Jones (L-J) potential; hence, there was no need to consider the contribution by free electrons to a thermal conductivity. The results were not influence...

The PCM based energy storage system is commonly used for storing waste heat and solar heat. Main disadvantage of such system is slow response during charging and discharging. In the present experiment thermal conductivity of wax based storage system is improved by embedding Copper,Aluminium and iron springs. Experiments shows that such systems show superior performance during charging and disch...

Carbon nanotube-copper (CNT/Cu) composites have been successfully synthesized by means of a novel particles-compositing process followed by spark plasma sintering (SPS) technique. The thermal conductivity of the composites was measured by a laser flash technique and theoretical analyzed using an effective medium approach. The experimental results showed that the thermal conductivity unusually d...