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Wang, Liang-Bi; Zhang, Qiang; Li, Xiao-Xia – European Journal of Physics, 2009
This paper aims to contribute to a better understanding of convective heat transfer. For this purpose, the reason why thermal diffusivity should be placed before the Laplacian operator of the heat flux, and the role of the velocity gradient in convective heat transfer are analysed. The background to these analyses is that, when the energy…
Descriptors: Energy Conservation, Energy, Physics, Science Instruction
Bringuier, E. – European Journal of Physics, 2009
The paper analyses particle diffusion from a thermodynamic standpoint. The main goal of the paper is to highlight the conceptual connection between particle diffusion, which belongs to non-equilibrium statistical physics, and mechanics, which deals with particle motion, at the level of third-year university courses. We start out from the fact…
Descriptors: Thermodynamics, Mechanics (Physics), Scientific Concepts, Science Instruction
Marin, E.; Lara-Bernal, A.; Calderon, A.; Delgado-Vasallo, O. – European Journal of Physics, 2011
Some peculiarities of the heat transfer through a sample that is heated by the superficial absorption of light energy under continuous uniform illumination are discussed. We explain, using a different approach to that presented in a recent article published in this journal (Salazar "et al" 2010 "Eur. J. Phys." 31 1053-9), that the front surface of…
Descriptors: Heat, Science Instruction, Thermodynamics, Light
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Brouwer, W.; Paranjape, B. V. – Physics Education, 1991
The forward force of water on a hose is calculated using only the pressure gradient, the radius and length of the hose. The misconception about recoil on the nozzle is discussed. Dissipation energy and the consequent heat generation in a fluid flow are also described. (KR)
Descriptors: College Science, Energy, Fluid Mechanics, Heat