流化床内颗粒碰撞传热的理论研究  

THEORETICAL STUDY ON IMPACT HEAT TRANSFER BETWEEN PARTICLES IN FLUIDIZED BED

作　　者：刘安源[1] 刘石[1] 

机构地区：[1]中国科学院工程热物理研究所,北京100080

出　　处：《中国电机工程学报》2003年第3期161-165,共5页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50076045)。 ~~

摘　　要：流化床内颗粒碰撞传热对床内传热规律具有重要影响。在分析颗粒碰撞传热机理的基础上建立了一个新的颗粒碰撞传热理论模型,该模型综合考虑了固体颗粒内部导热热阻及颗粒间接触热阻对颗粒碰撞传热的影响。利用该模型及离散元素方法(DEM),对流化床内床层与壁面的碰撞传热系数在颗粒层次上进行了模拟,模拟结果与Syamlal等人采用颗粒相拟流体模型的计算结果以及Ozkaynak等人的实验结果相一致。但与Syamlal等人所用模型相比,该文模型所需主观假设较少。Impact heat transfer among particles plays an important role in fluidized bed heat transfer process. An innovative model on particles impact heat transfer is proposed in our work, in which the effects of both internal thermal resistance of solid particle and contact thermal resistance between impacting particles on heat transfer are considered. This model and Discrete Element Method (DEM) are combined to simulate bed-surface heat transfer coefficient in a bubbling fluidized bed at the level of particle, and the results support Syamlals simulation results based on pseudo-fluid model and Ozkaynaks test results. Comparatively with Syamlals model, our model needs fewer asumptions.

关 键 词：流化床 颗粒碰撞 传热理论 传热系数 

分 类 号：TK124[动力工程及工程热物理—工程热物理]