The mixing uniformity of the feeding gas TiCl4 and oxygen is the main characteristic of an oxidation reactor, which is a key equipment in titanium pigment production. Therefore, the fluid dynamic behavior of the feeding gas (TiCl4) in an annular channel, which affects the mixing uniformity, should be investigated thoroughly. According to the geometry of the annular channel, a realizable three-dimensional κ–ε turbulence model was developed in this study. To verify the model, the calculated results were compared with data published in the literature. The errors were 1.73% and 3.33% for radii of 175 and 215 mm, respectively, thereby validating the model. Using the developed model, the flow characteristics of TiCl4 in an oxidation reactor with a tangential inlet were investigated. The results showed that, with an increase in the circumferential angle of the annular channel, the velocity first increased and then decreased, with a maximum value at a circumferential angle of 60°. The inlet Reynolds numbers and hole density of the jet ring had slight effects on the dimensionless pressure distribution in the annular channel. With an increase in the flow flux or a decrease in the diameter of the inlet pipe, the pressure curve became smoother, indicating that a homogeneous distribution of the feeding gas could be obtained.

中文翻译：

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氯化法生产钛白粉环形通道循环流模拟

原料气TiCl4和氧气的混合均匀性是氧化反应器的主要特性，是钛白粉生产的关键设备。因此，应彻底研究影响混合均匀性的环形通道中进料气体 (TiCl4) 的流体动力学行为。根据环形通道的几何形状，本研究开发了一个可实现的三维 κ-ε 湍流模型。为了验证模型，将计算结果与文献中公布的数据进行了比较。半径为 175 和 215 毫米的误差分别为 1.73% 和 3.33%，从而验证了模型。使用开发的模型，研究了具有切向入口的氧化反应器中 TiCl4 的流动特性。结果表明，随着环形通道圆周角的增大，速度先增大后减小，在圆周角为60°时达到最大值。射流环入口雷诺数和孔密度对环形通道无量纲压力分布的影响很小。随着流量的增加或进气管直径的减小，压力曲线变得更平滑，表明进料气体可以得到均匀分布。