This work deals with estimating the dominant size enlargement mechanism in spray fluidized beds. A new process model is presented, which consists of population balances and a heat‐ and mass‐transfer model. New methods to incorporate the wet surface fraction and the Stokes criterion are proposed, which allow for the probability of wet collisions and the probability of successful wet collisions to be calculated. The product of these parameters, the probability of successful collisions, is linked to the dominant size enlargement mechanism. Simulation studies were performed to investigate the influence of inlet gas temperature, viscosity, droplet size, and contact angle on the probability of successful collisions. Further simulation results based on experiments available in literature suggest that exceeding a probability of successful collisions of 0.001 is sufficient for agglomeration to become dominant. Otherwise, layering will be the dominant size enlargement mechanism. Finally, regime maps of layering and agglomeration are constructed.

中文翻译：

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喷雾流化床工艺中主要尺寸增大机理的估计

这项工作涉及估计喷雾流化床中占主导地位的尺寸增大机制。提出了一个新的过程模型，该模型包括人口平衡以及传热和传质模型。提出了结合湿表面分数和斯托克斯准则的新方法，该方法允许计算湿碰撞的概率和成功的湿碰撞的概率。这些参数的乘积（成功碰撞的概率）与占主导地位的尺寸扩大机制有关。进行了模拟研究，以研究进气温度，粘度，液滴尺寸和接触角对成功碰撞概率的影响。基于文献中可用实验的进一步模拟结果表明，成功碰撞的可能性超过了0。001足以使聚集成为主导。否则，分层将是主要的尺寸增大机制。最后，构建了分层和集聚状态图。