Investigation of gas-solid heat and mass transfer in a Wurster coater using a scaled CFD-DEM model
Investigation of gas-solid heat and mass transfer in a Wurster coater using a scaled CFD-DEM model
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使用缩放 CFD-DEM 模型研究 Wurster 涂布机中的气固传热传质
DOI：
10.1016/j.powtec.2022.117598
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发表时间：
2022-06
影响因子：
5.2
通讯作者：
R.H. Ge
中科院分区：
文献类型：
--
作者：
H.Q. Che;H.G. Wang;L.J. Xu;R.H. Ge
有关气固传热传质的详细知识对于流化床包衣工艺的设计和优化至关重要。耦合计算流体动力学和离散元方法 (CFD-DEM) 是理解这一过程的强大工具。然而，在之前的 CFD-DEM 研究中，相间传热传质似乎被大大简化甚至忽略了。在这项工作中，提出了一个完整可靠的 CFD-DEM 模型来研究 Wurster 涂层工艺。颗粒-流体热对流、涂层液体喷射以及喷射液体在颗粒表面蒸发的数值方法受到了相当多的关注。为了能够在可接受的运行时间内模拟具有许多颗粒的涂层过程，提出了一种考虑相间传热和传质的新颖缩放方法。然后通过不同尺度下的模拟结果和实验中的温度/湿度数据来验证所提出的CFD-DEM模型。模拟揭示了涂覆过程中颗粒干燥的三种模式，沿环形区域垂直方向安装的多个湿度探头将有助于提前预测过度喷涂。所提出的方法可以扩展到喷动床和顶喷床。不同缩放程度下的粒子分布快照（粒子速度用颜色表示）。 • 建立了一种用于颗粒涂层工艺的新CFD-DEM 缩放方法。 • 在涂层过程中观察到三种颗粒干燥模式。 • 强烈的液体蒸发主要发生在涂布和润版区域。 • 沿着环形区域安装的湿度探头可以预测过度喷涂。
Detailed knowledge about the gas-solid heat and mass transfer is essential for the design and optimization of the fluidized bed coating process. Coupled computational fluid dynamics and discrete element method (CFD-DEM) is a powerful tool to understand such a process. However, in previous CFD-DEM studies, the inter-phase heat and mass transfer appeared to be substantially simplified or even neglected. In this work, a complete and reliable CFD-DEM model is proposed to investigate the Wurster coating process. Considerable attention is paid to numerical methods on the particle-fluid heat convection, coating liquid spraying and the evaporation of sprayed liquid on the particle surface. To allow the simulation of coating processes with many particles in an acceptable runtime, a novel scaling approach accounting for the interphase heat and mass transfer is proposed. The proposed CFD-DEM model is then validated by the simulation results under different scaling degrees and the temperature/humidity data in experiments. The simulations reveal three modes of particle drying in the coating process, and multiple humidity probes mounted along the vertical direction of the annulus region would be helpful to predict the over-spraying in advance. The proposed methodology can be extended to the spouted and top-spray beds. Snapshot of the particle distributions under different scaling degrees (the particle velocity is indicated by color). • A new CFD-DEM scaling approach for the particle coating process is established. • Three particle drying modes were observed in the coating process. • Intensive liquid evaporation mainly occurs in the coating and fountain regions. • Humidity probes mounted along the annulus region can predict the over-spraying.
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影响因子：
2.1
作者：
Fries, Lennart;Dosta, Maksym;Palzer, Stefan
通讯作者：
Palzer, Stefan
影响因子：
5.2
作者：
M. R. Parise;Carlos A. Silva;Marcos J. Ramazini;O. Taranto
通讯作者：
M. R. Parise;Carlos A. Silva;Marcos J. Ramazini;O. Taranto
影响因子：
4.2
作者：
Q. Hou;Zongyan Zhou;A. Yu
通讯作者：
Q. Hou;Zongyan Zhou;A. Yu
影响因子：
5.2
作者：
S. Nase;W. L. Vargas;A. Abatan;J. J. McCarthy-J.
通讯作者：
S. Nase;W. L. Vargas;A. Abatan;J. J. McCarthy-J.
DOI：
10.1002/nag.476
发表时间：
2006-03
影响因子：
4
作者：
F. Soulié;F. Cherblanc;M. E. Youssoufi;C. Saix
通讯作者：
F. Soulié;F. Cherblanc;M. E. Youssoufi;C. Saix