Abstract A probabilistic heat transfer model was developed that allows for the gradual evolution of bed-to-surface heat transfer coefficients with increasing superficial gas velocity when bubbling and turbulent flow structures co-exist. The model is based on the packet renewal theory and the probability of particle packets for the specific hydrodynamic regime adjacent to the heat transfer surface. Assuming distinctive two-phase flow, dense packets at minimum fluidization voidage and voids almost free of particles, causes the heat transfer coefficients to be underestimated in the turbulent flow regime. By allowing for contributions of structures of intermediate voidage that reflect typical behavior in the turbulent flow regime of fluidization, heat transfer predictions are improved significantly. The resulting model is shown to give good agreement with experimental heat transfer data for fluidized beds of FCC and Alumina particles, changing smoothly from one flow regime to another in columns of different diameters and from the core of the bed to the wall.

中文翻译：

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湍流流化床的概率传热模型

摘要 开发了一种概率传热模型，当鼓泡和湍流结构共存时，该模型允许床面传热系数随着表观气体速度的增加而逐渐演变。该模型基于包更新理论和与传热表面相邻的特定流体动力学状态的粒子包概率。假设独特的两相流，在最小流化空隙和空隙中几乎没有颗粒的致密包，导致在湍流状态下传热系数被低估。通过考虑反映流化湍流状态中典型行为的中间空隙结构的贡献，传热预测得到显着改善。