The bubble-to-emulsion mass transfer at non-isothermal conditions is investigated via a coupled computational fluid dynamics-discrete element method (CFD-DEM) approach. The application of CFD-DEM approach in mass exchange prediction is verified. Meanwhile, mass transfer behaviors for an isolated bubble at different injection temperatures are analyzed. It is found that the non-uniform gas concentration is significantly influenced by the uneven temperature inside the bubble besides the impact of flow patterns. Furthermore, the effects of bubble interaction and coalescence on mass transfer are discussed. Two bubbles are injected through the same orifice or two horizontally separated orifices. It is observed that the mass transfer process for two vertically separated bubbles is greatly enhanced in the final period owing to the powerful “suction effect” from the upper bubble. Whereas the mass transfer becomes weak when two bubbles are horizontally injected.

通过耦合计算流体动力学-离散元方法（CFD-DEM）方法研究了非等温条件下的气泡-乳液传质。验证了CFD-DEM方法在质量交换预测中的应用。同时，分析了在不同注入温度下一个孤立气泡的传质行为。已经发现，除了流型的影响之外，气泡内部温度的不均匀还显着影响气体浓度的不均匀。此外，讨论了气泡相互作用和聚结对传质的影响。通过同一孔口或两个水平分离的孔口注入两个气泡。可以看出，由于上部气泡的强大“吸力效应”，两个垂直分离的气泡的传质过程在最后阶段得到了极大的增强。而当水平注入两个气泡时，传质变弱。