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通过混合物模型和阳极气泡聚并与破裂模型的耦合求解,引入标准湍流模型,利用流体力学计算软件FLUENT对稀土电解槽内阳极气泡进行数值仿真模拟,并对比分析了不同时间、不同阳极电流密度和不同极距下阴阳两极间的气泡对槽内流体速度场和槽内含气率分布的影响及规律。由计算结果分析可知:稀土电解槽阴阳两极间中上部区域和电解槽槽底区域表现出对称涡旋流动;阳极电流密度相同时,局部涡旋流动随电解时间逐渐增强、径向含气率逐渐增加,并且在电解后期阳极气泡表现出了聚并和破裂的运动状态;电流的增大使槽内流体的湍流强度增强、气泡的聚并和破裂加强;槽内流体的湍流强度和有效热导率在不同阳极电流密度下的分布曲线均呈现4个单峰分布;当阳极电流密度为1.5 A·cm~(-2)时,槽内流体的湍流强度和有效热导率分布较好;极距和阳极电流密度最合适匹配数值分别为82.5 mm和1.5 A·cm~(-2)。
A standard turbulence model was introduced by coupling the mixture model and anode bubble aggregation with the rupture model. The numerical simulation of the anode bubble in the rare earth electrolysis cell was carried out by using the software FLUENT of hydrodynamics. The comparison of the current density at different times, Influence of bubbles between yin and yang poles on the velocity field of gas in the tank and gas distribution in the tank at different polar distances. From the calculation results, it can be seen that the middle-upper region between the anode and the cathode of the rare-earth electrolytic cell and the bottom of the electrolytic cell show a symmetrical vortex flow. When the anode current density is the same, the local vortex flow gradually increases with the electrolysis time and the radial gas- , And the anodic bubbles at the late stage of electrolysis show the state of convergence and rupture. The increase of the current increases the turbulence intensity of the fluid in the tank and the coalescence and rupture of the bubbles. The turbulence intensity and effective thermal conductivity When the anode current density is 1.5 A · cm ~ (-2), the turbulent intensity and effective thermal conductivity of the fluid in the tank are well distributed. The pole pitch And anode current density were 82.5 mm and 1.5 A · cm -2, respectively.