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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical modeling of flow film boiling in cryogenic chilldown process using the AIAD framework
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Numerical modeling of flow film boiling in cryogenic chilldown process using the AIAD framework

机译：使用AIAD框架进行低温冷却过程中流动膜沸腾的数值模拟

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摘要

Flow film boiling plays a dominant role in cryogenic chilldown process, which involves complicated heat transfer and flow regime transition. Nevertheless, existing researches about flow film boiling with cryogenic fluids are relatively limited. In this study, a Computational Fluid Dynamics (CFD) model based on a wall heat flux partition algorithm is built. The AIAD framework implemented in the two-fluid model is employed to appropriately calculate the drag force on the liquid-vapor interfaces. The CFD model is validated by the satisfactory coincidence between the simulated heat fluxes and experimental data in literature. Accordingly, the two-phase interaction on the flow regime and heat transfer is further investigated. The results reveal that the vapor film beneath the bulk liquid becomes thinner due to the drag force on the liquid-vapor interface. In addition, FFT analysis on the pressure drop shows that dominant frequency of the interfacial waves in the tube mainly locates around 2.8 Hz. The normalized intensity indicates that fluctuation becomes more violent with the increase of superheat and inlet liquid flow rate. Finally, comparison between correlations and experimental data indicates that a correlation of heat transfer coefficient considering both film boiling effect and forced convective flow effect needs to be proposed. (C) 2018 Elsevier Ltd. All rights reserved.
机译：流膜沸腾在低温冷却过程中起主要作用，该过程涉及复杂的传热和流态转换。然而，有关用低温流体沸腾沸腾的现有研究相对有限。在这项研究中，建立了基于壁热通量分配算法的计算流体动力学（CFD）模型。采用在两流体模型中实现的AIAD框架来适当地计算在液-汽界面上的阻力。 CFD模型通过模拟热通量与文献中的实验数据之间的令人满意的一致性来验证。因此，进一步研究了流态和传热两相相互作用。结果表明，由于在液体-蒸汽界面上的拖曳力，散装液体下方的蒸汽膜变得更薄。另外，对压降的FFT分析表明，管内界面波的主频主要位于2.8 Hz附近。归一化强度表明，随着过热度和入口液体流速的增加，波动变得更加剧烈。最后，相关性和实验数据之间的比较表明，需要同时考虑薄膜沸腾效应和强制对流效应的传热系数。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
  • 作者

    Chen Jianye; Zeng Ruirui; Zhang Xiaobin; Qiu Limin; Xie Junlong;

  • 作者单位

    Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R China;

    Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R China;

    Zhejiang Univ, Inst Refrigerat & Cryogen, Key Lab Refrigerat & Cryogen Zhejiang Prov, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, Inst Refrigerat & Cryogen, Key Lab Refrigerat & Cryogen Zhejiang Prov, Hangzhou 310027, Zhejiang, Peoples R China;

    Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cryogenic; Chilldown; AIAD model; Flow film boiling; CFD; Heat flux;

    机译：低温;降温;AIAD模型;流膜沸腾;CFD;热通量;

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