Abstract Optimisation design of gas-liquid packed column filled with structured packing during the absorption process requires an accurate prediction of the liquid distribution. A two-dimensional computational fluid dynamics (CFD) model is developed for the structured packed column which is applied in floating liquefied natural gas (FLNG) in offshore platforms. And several user-defined functions (UDFs) based on the dynamic mesh technology are incorporated in Fluent to quantitatively evaluate how the pressure drops, the liquid volume fraction, and liquid radial and axial velocities are affected by sloshing angles, periods, and displacements. The results show that the sloshing angle has significant effects on the liquid volume fraction in the central region of the column as its value increases by 145% for a sloshing angle of 9°. And the turning points of the liquid volume fraction and liquid radial velocity appear at the same time. Furthermore, the liquid volume fraction, the liquid radial and axial velocities of the packed column fluctuate periodically around the values of the vertical steady state under different sloshing periods and displacements. The critical value of the sloshing displacement is determined as 150 mm based on the minimum range of liquid radial dispersion in the packed column.

中文翻译：

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二维填充柱模拟中晃动对并发两相流场影响的动态网格模拟

摘要 吸收过程中填充规整填料的气液填料塔的优化设计需要准确预测液体分布。针对海上平台浮式液化天然气（FLNG）中应用的结构化填料塔，建立了二维计算流体动力学（CFD）模型。并且 Fluent 中包含了几个基于动态网格技术的用户定义函数 (UDF)，以定量评估压降、液体体积分数以及液体径向和轴向速度如何受晃动角度、周期和位移的影响。结果表明，晃荡角对柱中心区域的液体体积分数有显着影响，晃荡角为9°时，其值增加145%。并且液体体积分数和液体径向速度的转折点同时出现。此外，在不同的晃动周期和位移下，填料塔的液体体积分数、液体径向和轴向速度围绕垂直稳态值周期性波动。根据填料塔中液体径向分散的最小范围，确定晃动位移的临界值为 150 mm。