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风雨182木虫 (正式写手)
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从目前关于改善流化床传热特性的研究进展来看，主要集中在搅拌和振动流化床的应用研究，而关于声场流化床传热特性的文献目前尚未见报道。主要原因是声场实验装置复杂以及流化床内部的非直观性导致其测试困难。另外，床内气体与颗粒的流体动力特性也很复杂，气流与颗粒之间处于非稳态传热过程。 与普通流化床相比，声场流化床中声能通过质点的振动传递能量，声波脉动速度产生的曳力和空气质点产生的碰撞力是改善颗粒流化质量及提高床内传热特性的主要作用力，使得气流与颗粒之间有足够强的相对冲刷速度，达到了强化传热的目的，这正是研究声场流化床传热特性的出发点。 |
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phyweiw(金币-2):机器翻译，不加说明，故而扣分 2010-03-24 22:06
phyweiw(金币-2):机器翻译，不加说明，故而扣分 2010-03-24 22:06
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From now on improving the fluidized bed heat transfer characteristics of the research point of view, mainly concentrated in the application of fluidized bed mixing and vibration studies, while the sound field on the fluidized bed heat transfer characteristics of the literature has not been reported. The main reason is the complex sound field experimental device, as well as the non-intuitive nature of the internal fluidized bed lead to difficulties in testing. In addition, the bed gas and fluid dynamic properties of particles is also very complex, between the air and the particles in a non-steady state heat transfer process. Compared with ordinary fluidized bed, fluidized bed in the acoustic sound field of vibration transmission through the particle energy, sonic pulse velocity and air drag force generated by particle collisions produced by particle flow of force is to improve the quality and enhance the heat transfer characteristics of bed the main force, allowing air and particles sufficiently strong between the relative erosion rate, reaching the purpose of enhanced heat transfer, this is the study of sound field characteristics of fluidized bed heat transfer point of departure. |
2楼2010-03-21 17:44:34
风雨182
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3楼2010-03-22 14:35:40