第2个回答 2010-11-16
Direct contact with the surface of the fluid, because of heat and heat, light, and with the neighboring fluid the density of a rise. this motion because of sticky fluid and blockaded. 1 and heat passes by the following factors: the heat of the expansion of gravity, 2, and the proliferation of delaying action for the hot sticky. the heat transfer is considered on gravity and acceleration of hot, sticky in the expansion of the motion, and thermal coefficient. the geometry, radiation and direction of the surface, it is estimated that they
第3个回答 2010-11-16
heated, becomes lighter, and because of the density difference between the fluid and the adjacent rise. This movement have been hampered due to fluid viscosity. 1, heat transfer by the following factors: due to thermal expansion caused by gravity, 2, viscous and thermal diffusion block. This heat transfer is considered to depend on the acceleration of gravity, thermal expansion coefficient, sports viscosity coefficient, and thermal conductivity
2.Different geometry, the direction of the surface radiative properties and the estimated heat transfer rate between them, often assume that: 1, all surfaces are gray or black, 2, diffuse radiation and reflection, 3, the entire surface uniform parameter, 4, and the absorption rate equal to the emission rate has nothing to do with the projection of the temperature of radiation, 5, the material between the two surfaces is neither radiation nor absorbs radiation emission. These assumptions because they provide a great degree of simplification was used, although the results can only be considered approximate.
采纳哦,好难翻译呀!!!!!!!!