WETTING PERFORMANCE AND PRESSURE DROP OF STRUCTURED PACKINGS : CFD AND EXPERIMENT

WETTING PERFORMANCE AND PRESSURE DROP OF STRUCTURED PACKINGS : CFD AND EXPERIMENT
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规整填料的润湿性能和压降：CFD 和实验

DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Thermische Verfahrenstechnik
Thermische Verfahrenstechnik
中科院分区：
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文献类型：
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作者：
A. Ataki;P. Kolb;U. Bühlman;H. Bart;TU Kaiserslautern;Thermische Verfahrenstechnik

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Rombopak 4M (TM Kuhni, CH) 规整填料元件的润湿性能已通过实验和计算流体动力学 (CFD) 模拟在不同液体负载 (12 4 50 m/mh) 和不同性质（表面张力、粘度和接触角）的液体下进行研究。实验中使用了染色的甘油水（含有和不含表面活性剂）和氯苯-乙苯液体混合物。通过光学方法进行实验评价（铺展、润湿）。通过使用传感器的光学方法测量膜厚度，并通过CCD相机评价接触角。采用Fluent的VOF（Volume of Fluid）模型进行仿真。在对简单的平面几何形状进行首次确认后，对典型的薄片进行了研究。这已进一步扩展到代表包装板的一块薄片。模拟很好地代表了实验结果，可用于推导某些系统和操作条件下持液率和有效界面面积的相关性。此外，干燥压降是单独计算的，因此虚拟实验揭示了复杂几何形状中的局部流体动力学。在演示中，将给出与模拟和实验数据的比较，并得出相关性，描述水力行为。
The wetting performance of a structured packing element of Rombopak 4M (TM Kuhni, CH) has been studied experimentally and by computational fluid dynamics (CFD) simulations at different liquid loads (12 4 50 m/mh) and liquids varying in their properties (surface tension, viscosity and contact angle). Dyed glycerinewater (with and without surfactant) and chlorobenzene-ethylbenzene liquid mixtures, have been used in the experiments. The experimental evaluation (spreading, wetting) was performed by optical methods. Film thickness was measured by an optical method using a sensor and the contact angle was evaluated by a CCD camera. The VOF (Volume of Fluid) model of Fluent has been used for simulation. After a first confirmation on a simple planar geometry a typical lamella has been investigated. This has been further extended to a block of lamellas representing a packing sheet. The simulations well represent the experimental findings and can be used to derive correlations for liquid hold-up and effective interfacial area at certain system and operating conditions. Additionally, the dry pressure drop is calculated separately, thus virtual experiments reveal the local hydrodynamics in complex geometries. In the presentation a comparison with simulations and experimental data will be given and correlations derived, describing the hydraulic behaviour.