نتایج جستجو برای: thermal gradient method
تعداد نتایج: 1906782 فیلتر نتایج به سال:
چکیده ندارد.
The thermal barrier coatings (TBCs) by gas tunnel-type plasma spraying exhibited ceramic-composite features consisting of a host oxide matrix ceramic with an embedded second phase material. The densities of the composite TBC were found to be higher than those sprayed with 100wt% ZrO2 or Al2O3. In the coatings produced with powder mixtures of 50wt%, the embedded splats are found to have a relati...
This paper reports on the thermal characteristics of the high power light emitting diode (LED) package and numerical optimal analysis is used to design the size of the LED package for the purpose of improving the heat dissipation. The simplified conjugate-gradient method (SCGM) is adopted to combine with the finite element method (FEM) to optimize the shape of the heat sink inside the LED packa...
The Vereina railway tunnel drilled in Austroalpine nappes encountered little water inflows. The linear discharge rates vary between 0,003 and 0,006 l/s/m (Figure 1). Two different water temperatures series have been observed in both northern and southern parts of the tunnel trace. The northern thermal gradient is equal to 0,018°C/m while the southern thermal gradient is not very different with ...
Centrifugal casting of composites and ceramics has been widely employed to improve the mechanical and thermal properties of functional materials. This powerful method has yet to be deployed in the context of nanoparticles--yet size-effect tuning of quantum dots is among their most distinctive and application-relevant features. Here we report the first gradient nanoparticle films to be construct...
Thermal diffusion has been studied for over 150 years. Despite of the long history and the increasing importance of the phenomenon, the physics of thermal diffusion remains poorly understood. In this paper Ludwig’s thermal diffusion is explained using Einstein’s random walk. The only new structure added is the spatial heterogeneity of the random walk to reflect the temperature gradient of therm...
We analyze heat transfer characteristics of steady electroosmotic flows with an arbitrary pressure gradient in two-dimensional straight microchannels considering the effects of Joule heating in electroosmotic pumping. Both the temperature distribution and local Nusselt number are mathematically derived in this study. The thermal analysis takes into consideration of the interaction among advecti...
This paper contains a strain gradient theory to capture size effects in rotating nanodisks of variable thickness under thermal and mechanical loading. Material properties of nanodisks have been taken homogeneous material. The strain gradient theory and the Hamilton’s principle are employed to derive the governing equations. Due to complexity of the governing differential equation and boundary c...
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