A classical Euler–Lagrangian model for gas–solid flows was extended with gas component mass conservation equations and used to obtain fundamental insights into bubble-to-emulsion phase mass transfer in bubbling gas–solid fluidized beds. Simulations of injected single rising bubbles under incipient fluidization conditions were carried out, using Geldart-A and -B particles. Phenomena observed in the simulations and those of various theoretical models used to derive phenomenological models were compared to challenge the assumptions underlying the phenomenological models. The bubble-to-emulsion phase mass transfer coefficients calculated for the simulations using Geldart-B particles were in a good agreement with predictions made using the Davidson and Harrison (1963) model. The bubble-to-emulsion phase mass transfer coefficients for Geldart-A particles were, however, much smaller than the predictions obtained from theoretical models (e.g. Chiba and Kobayashi (1970)). The newly developed model allows a detailed analysis of various hydrodynamic aspects and their effects on the mass transfer characteristics in and around rising bubbles in fluidized beds.

用气体成分质量守恒方程扩展了经典的气固两相流的欧拉-拉格朗日模型，并用于获得鼓泡气固流化床中气泡-乳液相传质的基础知识。使用Geldart-A和-B粒子对在初始流化条件下注入的单个上升气泡进行了模拟。在模拟中观察到的现象和用于导出现象学模型的各种理论模型的现象进行了比较，以挑战现象学模型的基础假设。使用Geldart-B颗粒进行模拟计算得出的气泡-乳液相传质系数与使用Davidson and Harrison（1963）模型进行的预测非常吻合。然而，Geldart-A颗粒的气泡-乳液相传质系数远小于从理论模型（例如Chiba和Kobayashi（1970））获得的预测值。新开发的模型可以对流体动力学的各个方面及其对流化床中上升气泡及其周围传质特性的影响进行详细分析。