用壁共轭态VOF法模拟水平管内R-142b饱和蒸汽凝结

IF 0.9 Q4 ENERGY & FUELS
G. G. Yan’kov, K. B. Minko, O. O. Mil’man, V. I. Artemov
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引用次数: 0

摘要

由于现代计算流体力学(CFD)代码的先进功能以及已开发的模型和算法,数值模拟已成为研究两相流、分析其中发生的整个过程以及获得难以直接测量的流动局部特征数据的有效工具。在将新模型纳入各种CFD代码时,应积极进行交叉验证,交叉验证的结果可作为选择最准确、最高效、最通用的模型和算法的基础。本文利用ANES和ANSYS Fluent两种CFD软件对水平管内R-142b制冷剂饱和蒸汽在壁面共轭状态下的冷凝问题进行了分析。铜管的内径为28 mm,长度为2.75 m,壁厚为2mm,总质量通量为47 kg/(m2 s),研究结果与基于有机朗肯循环的热回收装置相关。计算是使用我们之前提出的修改后的Lee模型进行的,该模型已在NRU MPEI工程热物理系开发的ANES CFD代码中实现。在ANES和ANSYS Fluent代码中实现的VOF算法的交叉验证表明,使用上述代码对水平管道中饱和蒸汽凝结进行建模的结果彼此吻合良好,并且接近文献来源(M. Shah)中推荐的计算水平通道中凝结的经验依赖关系。给出了管内局部传热特性分布的数据,表明传热系数在管内长度和周长上都具有本质的不均匀性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modeling of R-142b Saturated Vapor Condensation in a Horizontal Tube Using the VOF Method in the Wall Conjugate Statement

Due to the advanced capabilities of modern computational fluid dynamics (CFD) codes and developed models and algorithms, numerical simulation has become an efficient tool for studying two-phase flows, analyzing the entire totality of the processes occurring in them, and obtaining the data on flow local characteristics, which are difficult to measure directly. Active efforts taken for incorporating new models into various CFD codes should be accompanied by their cross-verification, the results of which can serve as a basis for selecting the most accurate, efficient, and universal models and algorithms. In this article, the results obtained from the solution of the problem about the condensation of R-142b refrigerant saturated vapor in a horizontal tube in the wall conjugate statement using two CFD codes, ANES and ANSYS Fluent, are analyzed. The copper tube’s inner diameter is 28 mm, its length is 2.75 m, wall thickness is 2 mm, and the total mass flux is 47 kg/(m2 s). The studies are of relevance for heat recovery installations based on the organic Rankine cycle. The calculations were carried out using the modified Lee model that we suggested previously, and which has been implemented in the ANES CFD code developed at the Department of Engineering Thermophysics, NRU MPEI. The cross verification of the VOF algorithms implemented in the ANES and ANSYS Fluent codes has shown that the results of modeling the saturated vapor condensation in a horizontal tube obtained using the above-mentioned codes are in good agreement with each other and are close to the empirical dependences recommended in the literature sources (M. Shah) for calculating the condensation in a horizontal channel. Data on the distribution of local heat-transfer characteristics over the tube’s inner wall are presented, which demonstrate that the heat-transfer coefficient features an essential nonuniformity over both the tube length and perimeter.

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来源期刊
CiteScore
1.30
自引率
20.00%
发文量
94
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