The combined effects of particle concentration (0–20 vol%) and particle size on the hydrodynamics of a slurry bubble column were studied by computational fluid dynamics coupled with population balance model (CFD‐PBM) in a wide range of superficial gas velocity (0.02–0.20 m/s). This CFD‐PBM coupled model included multiple effects of particles, namely increased slurry viscosity, reduced drag force, promoted bubble coalescence, and attenuated liquid turbulence, among which turbulence attenuation was crucial. To quantify liquid turbulence attenuation, a mechanistic model was established by equating the energy dissipated by particle motion to the attenuated liquid turbulence energy calculated from turbulent energy spectrum. The turbulent energy dissipation rate was reduced by over 60% at a solid concentration of 20%. Using this model, the effects of particle concentration and particle size on overall gas holdup were well predicted. This model advanced our understanding of how particles affect the gas holdup in a slurry bubble column.

中文翻译：

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使用 CFD-PBM 耦合模型对浆液泡罩塔中颗粒浓度和尺寸效应进行数值模拟


通过计算流体动力学与群体平衡模型 (CFD-PBM) 相结合，在广泛的表观气速 (0.02 –0.20 m/s）。该CFD-PBM耦合模型包括颗粒的多重效应，即增加浆料粘度、降低阻力、促进气泡聚结和减弱液体湍流，其中湍流衰减至关重要。为了量化液体湍流衰减，通过将粒子运动耗散的能量等同于根据湍流能谱计算的衰减液体湍流能量，建立了机械模型。当固体浓度为20%时，湍流能量耗散率降低了60%以上。使用该模型，可以很好地预测颗粒浓度和颗粒尺寸对总体含气率的影响。该模型加深了我们对颗粒如何影响浆液泡罩塔中的含气率的理解。