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首页> 外文期刊>International Journal of Heat and Mass Transfer >Analysis and prediction of heat transfer deterioration of supercritical pressure cryogenic methane in a vertical tube
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Analysis and prediction of heat transfer deterioration of supercritical pressure cryogenic methane in a vertical tube

机译：垂直管中超临界压力低温甲烷传热劣化的分析与预测

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摘要

Developing a compact vaporizer with high thermal efficiency is of great significance to the storage and usage of Liquid Natural Gas (LNG). Numerical simulations were performed to investigate the flow and heat transfer characteristics of supercritical pressure methane in a vertical tube, and primary focus was to reveal the mechanism of two-peak wall temperatures occurrence. Six turbulent models have been confronted with experimental data, and the Renormalization Group (RNG) k-ε model is adopted. When Heat Transfer Deterioration (HTD) occurs, two-peak wall temperatures appear in the upward flow with high mass flux. The phenomenon of two-peak wall temperatures were explained in detail based on radial distributions of velocity and turbulent kinetic energy at different axial positions. The "M"-shape velocity distribution promotes the generation of turbulence in the core region. The reversal of radial flow direction enhances the mixing between hot and cold fluids. A new criterion was proposed for predicting the critical heat flux which causes the onset of HTD in supercritical pressure methane.
机译：具有高热效率的紧凑型蒸发器对液体天然气（LNG）的储存和用途具有重要意义。进行数值模拟以研究垂直管中超临界压力甲烷的流动和传热特性，主要焦点是揭示两峰壁温度发生的机理。六种湍流模型已经面临实验数据，采用重整化组（RNG）K-ε模型。当发生传热劣化（HTD）时，两峰壁温度出现在高麦克风的向上流动中。基于不同轴向位置的速度和湍流动能的径向分布，详细说明了两峰壁温度的现象。 “M”形速度分布促进核心区域中的湍流产生。径向流动方向的逆转增强了冷热流体之间的混合。提出了一种用于预测临界热通量的新标准，这导致超临界压力甲烷中的HTD发作。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第12期|121824.1-121824.9|共9页
  • 作者

    Lin Li; Wen-Quan Jiang; Yang Li; Shi-Yu Su; Jie-Feng Shi; Fan Yang;

  • 作者单位

    College of Mechanical Engineering Liaoning Petrochemical University Fushun 113001 Liaoning China;

    College of Mechanical Engineering Liaoning Petrochemical University Fushun 113001 Liaoning China;

    College of Petroleum Engineering Liaoning Petrochemical University Fushun 113001 Liaoning China;

    College of Petroleum Engineering Liaoning Petrochemical University Fushun 113001 Liaoning China;

    College of Petroleum Engineering Liaoning Petrochemical University Fushun 113001 Liaoning China;

    College of Petroleum Engineering Liaoning Petrochemical University Fushun 113001 Liaoning 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

    Key words: Supercritical fluid; Methane; Heat transfer deterioration; Buoyancy; Criterion;

    机译：关键词：超临界流体;甲烷;传热劣化;浮力;标准;

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