نتایج جستجو برای: heat sources
تعداد نتایج: 486461 فیلتر نتایج به سال:
in this paper, a three-dimensional finite element model has been developed to simulate the laser-tig hybrid welding (hlaw) of stainless steel 1.4418 with thickness of 4 mm. transient temperature profile and dimensions of the fusion zone and heat affected zone (haz) during welding process are calculatedusing finite element method (fem) and were solved in the abaqus/standard software.the heat sou...
Understanding thermal transport from nanoscale hot spots is important for a fundamental description of energy transport in materials, as well as many technological applications including thermal management in nanoelectronics, thermoelectric devices, nano-enhanced photovoltaics and nanoparticle-mediated thermal therapies. Heat transfer at the nanoscale is fundamentally different from that at the...
In this paper a numerical method is used to study the unsteady state natural convection heat transfer within a confined porous media with uniform internal heat generation. The governing equations based on the Darcy model and Bossiness approximations are solved, using the finite difference Alternating Direction Implicit (ADI) method. The developed program was used to simulate natural convection ...
Heat stress has adverse effects on livestock production, hence reducing benefits of them. With the viewpoint of reducing heat production within cells,an experiment was conducted to investigate the effects of different sources of fat on mitochondrial energetics of broilers in chronic heat-stress condition. The consumed fat included: a)tallow; as a source of long-chain fatty acids, b)coconut oil;...
A new method based on the thermal quadrupoles technique for heat transfer modelling in multilayered slabs with heat sources is proposed. Classical thermal quadrupoles use hyperbolic functions and numerical problems occur according to the argument value that depends on thermophysical and geometrical properties as well as characteristics times. We propose a new formulation based on exponential fu...
We comment on the first indication of geo-neutrino events from KamLAND and on the prospects for understanding Earth energetics. Practically all models of terrestrial heat production are consistent with data within the presently limited statistics, the fully radiogenic model being closer to the observed value (≈ 9 geo-events). In a few years KamLAND should collect sufficient data for a clear evi...
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