Three-dimensional numerical simulation of gas-liquid interfacial mass transfer with Rayleigh convection using hybrid LBM-FDM and its mass transfer coefficient model
Three-dimensional numerical simulation of gas-liquid interfacial mass transfer with Rayleigh convection using hybrid LBM-FDM and its mass transfer coefficient model
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基于混合LBM-FDM及其传质系数模型的瑞利对流气液界面传质三维数值模拟
DOI：
10.1016/j.ces.2018.12.001
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发表时间：
2019-04
影响因子：
4.7
通讯作者：
Xigang Yuan
中科院分区：
文献类型：
--
作者：
Xiaolong Ge;Botong Liu;Botan Liu;Hongxing Wang;Xigang Yuan
瑞利对流对气液界面传质有显著影响。然而，其强化机制至今仍不清楚。本文采用三维混合格子Boltzmann方法和有限差分方法对CO2-乙醇吸收过程中的瑞利对流进行了数值模拟。采用气相随机扰动模型描述了有效诱导瑞利对流的气液界面扰动。然后将三维模拟得到的正视图像与纹影观测结果进行比较以进行验证。最后，通过分析浓度等值线的俯视图和浓度等值线的耗散率，提出了基于浓度变化耗散率的传质系数理论模型。与小涡模型和表面散度模型相比，该模型在确定瑞利对流过程中的分子扩散阶段和对流传质阶段以及消除模型预测中的位相差异方面具有较强的优越性。
Rayleigh convection has a significant effect on gas-liquid interfacial mass transfer. However, its intensified mechanism has not been clarified so far. In the present work, three-dimensional hybrid Lattice Boltzmann Method-Finite Difference Method (LBM-FDM) was employed to simulate the Rayleigh convection emerging in the CO2-ethanol absorption process. A gas phase random disturbance model was applied to represent the disturbances on the gas-liquid interface which effectively induces Rayleigh convection. Then the front view images obtained by three-dimensional simulation were compared to the Schlieren observations for validation. Finally, a theoretical mass transfer coefficient model based on dissipation rate of concentration variance was proposed, by analyzing the overhead view of concentration contour and dissipation rate of concentration variance contour. Compared to the small eddy model and surface divergence model, the proposed model shows its strength in determining molecular diffusion stage and convective mass transfer stage of Rayleigh convection process, as well as eliminating the phase difference in model prediction.
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DOI：
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发表时间：
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期刊：
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影响因子：
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作者：
D. K. Sun;M. F. Zhu;S. Pan;C. Yang;D. Raabe
通讯作者：
D. K. Sun;M. F. Zhu;S. Pan;C. Yang;D. Raabe
影响因子：
4.1
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DOI：
10.1016/j.jcp.2006.10.023
发表时间：
2006-11
期刊：
J. Comput. Phys.
影响因子：
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作者：
K. Premnath;J. Abraham
通讯作者：
K. Premnath;J. Abraham
DOI：
10.1080/19942060.2010.11015334
发表时间：
2010-01
影响因子：
6.1
作者：
K. Tan;B. Tey;Y. Tan
通讯作者：
K. Tan;B. Tey;Y. Tan
影响因子：
4.7
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Zhifa Sun