波纹填料表面低温流体流动特性的数值和实验研究

IF 1.8 3区 工程技术 Q3 PHYSICS, APPLIED
Xiaoqin Zhi, Yixuan Teng, Huabin Zhou, Gaoming Zhan, Limin Qiu
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引用次数: 0

摘要

低温蒸馏是生产纯氧和氮气的重要方法。过去,由于低温实验成本高、难度大,用于低温蒸馏的结构填料主要是参照室温流体的测试结果进行开发和设计。低温流体在结构填料上的真实流动特性,如流动模式和润湿性等对蒸馏性能有重要决定作用的特性,还很少被揭示。在本研究中,借助三维 CFD 模型和可视化实验装置,详细揭示了在不同液体载荷和压接角度下,液氮(LN2)在 45° 倾斜填料元件几何单元内的流动特性。还进行了对比研究,以显示水和 LN2 之间不同的薄膜流动特性。此外,还探索了基于 250Y 结构填料的压接角度优化。模拟和实验结果表明,在实际低温蒸馏过程中,水的水压试验流动模式和润湿机制与 LN2 不同。由于物理性质不同,液氮的薄膜流动性能比水要好得多。此外,研究还发现卷曲角对润湿面积比有显著影响。对于 LN2 来说,90° 的卷曲角基本上就能获得足够高的润湿面积比,而对于水来说,要获得较高的润湿面积比,卷曲角需要大到 120°。这表明,在实际低温蒸馏过程中,以水为主要工作介质来测试和设计结构填料会带来明显的误差。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical and experimental investigation of cryogenic fluid flow characteristics on corrugated packing surfaces

Cryogenic distillation is a significant method for producing pure oxygen and nitrogen gas. In the past, due to the high cost and difficulty of conducting cryogenic experiments, the structured packings used in cryogenic distillation are mainly developed and designed by referring to the testing results of room-temperature fluids. The real flow characteristics of cryogenic fluids on structured packings, such as flow pattern and wettability which significantly determines the distillation performance, have seldom been revealed. In this study, with the help of a three-dimensional CFD model and a visual experimental setup, the liquid nitrogen (LN2) flow characteristics within the geometric unit of a 45° inclined packing element were revealed detailedly under different liquid loads and crimping angles. Comparison studies were also conducted to show the different film flow characteristics between water and LN2. Additionally, optimization of the crimping angles based on 250Y structured packing was explored. Both simulation and experiment show that the flow pattern and wetting mechanism of the hydraulic test on water are different from those of LN2 in the actual cryogenic distillation. The LN2 has much better film flow performance than water due to its different physical properties. In addition, it is found that the crimping angle has a significant effect on the wetting area ratio. For LN2, the crimping angle of 90° can basically result in a high enough wetting area ratio, while for water, the crimping angle as large as 120° is needed to achieve a high wetting area ratio. It shows that testing and designing the structured packing with water as the main working medium will bring apparent errors in real cryogenic distillation process.

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来源期刊
Cryogenics
Cryogenics 物理-热力学
CiteScore
3.80
自引率
9.50%
发文量
0
审稿时长
2.1 months
期刊介绍: Cryogenics is the world''s leading journal focusing on all aspects of cryoengineering and cryogenics. Papers published in Cryogenics cover a wide variety of subjects in low temperature engineering and research. Among the areas covered are: - Applications of superconductivity: magnets, electronics, devices - Superconductors and their properties - Properties of materials: metals, alloys, composites, polymers, insulations - New applications of cryogenic technology to processes, devices, machinery - Refrigeration and liquefaction technology - Thermodynamics - Fluid properties and fluid mechanics - Heat transfer - Thermometry and measurement science - Cryogenics in medicine - Cryoelectronics
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