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Investigation of Breakup and Coalescence Models for Churn-Turbulent Gas-Liquid Bubble Columns

机译:搅拌湍流气体泡沫柱分离与聚结模型的研究

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Three-dimensional Eulerian-Eulerian transient simulations were conducted to represent the gas-liquid flow of a heterogeneous bubble column. Different drag closures, breakup and coalescence models were evaluated in order to verify their influence on the model prediction. Numerical simulations were compared to experimental data, with industrial conditions of gas superficial velocities: 20cm/s and 40cm/s, in order to select the most suitable models to describe the bubble' dynamics in the heterogeneous flow. The standard k - epsilon model for both phases was set for turbulence. 12 combinations of breakup and coalescence models were compared and analyzed. In the case of coalescence, Models of Prince and Blanch, and Luo presented similar behavior and good agreement with experimental data, while for breakup, a breakage forming three daughter bubbles appeared to be the best choice. Simulations presented relative errors around 7.7% and 14.0%, for 20cm/s and 40cm/s respectively, for the gas axial velocity, and around 14% and 21.9%, for gas holdup. For drag force, density and viscosity were accounted by an average of the phases, which resulted in an improvement about 7% on model validation
机译:进行三维Eulerian-Eulerian瞬态模拟以表示异质泡沫柱的气液流。评估不同的阻力闭合,分发和聚结模型,以验证它们对模型预测的影响。将数值模拟与实验数据进行比较,具有天然气性感速度的工业条件:20cm / s和40cm / s,以选择最合适的模型来描述异质流动中的泡沫的动态。两个阶段的标准K - epsilon模型被设定为湍流。 12比较和分析了分类和聚结模型的组合。在聚结的情况下,王子和漂流的模型,罗呈现类似的行为和与实验数据的良好协议,同时进行分手,形成三个子气泡的破损似乎是最佳选择。模拟分别为气体轴向速度分别为20cm / s和40cm / s的相对误差为7.7%和14.0%,为20cm / s和40cm / s,约为14%和21.9%。对于拖曳力,密度和粘度被阶段的平均值占,导致模型验证的提高约7%

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