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首页> 外文期刊>International Journal of Heat and Mass Transfer >Comparison between modelled and measured heat transfer rates during the departure of a steam bubble from a solid surface
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Comparison between modelled and measured heat transfer rates during the departure of a steam bubble from a solid surface

机译：蒸汽气泡蒸汽泡沫蒸汽泡沫的蒸汽泡沫脱落期间的模型和测量热传递速率的比较

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摘要

This paper presents analysis of the heat transfer attendant upon the departure of a single steam bubble during pool boiling of water at atmospheric pressure. The flow of heat from a solid surface to liquid water during and immediately after bubble lift-off has been extracted from micro-scale measurements of the spatial and temporal variation of the temperature at the solid surface beneath the bubble. The numerical procedure used to extract the heat flux from the temperature variations at the solid surface has been assessed and verified, and applied to investigate the heat transfer during the bubble departure phase, and after the eventual bubble lift-off. Results confirm that fluid motion activated by a departing bubble is the cause of heat transfer enhancement. The phenomenon can be characterised as the process of rewetting, by an advancing liquid front, of a dry portion of wall area at the base of the bubble. The portion of wall area that is affected by the observed heat transfer augmentation mechanism has been found to be that of a circle of diameter roughly equal to half the bubble departure diameter. The current measurements enabled validation of interface-capturing numerical simulation of the hydrodynamics and heat transfer of single bubble formation and departure from a surface, including conjugate heat transfer in the solid substrate. From simulation results, the spatial and temporal variation of the heat flux at the solid surface beneath the bubble has been computed and monitored during bubble departure and after the eventual bubble lift-off. Heat transfer rates at bubble departure extracted from simulation have been found in good agreement with measurements. The simulation correctly captured experimental trends and was found to give an accurate estimate of the magnitude of the flows of heat to the liquid due to the bringing of cold fluid in the vicinity of the wall caused by the bubble departure process.
机译：本文介绍了在池沸水的落后水处理在大气压下的蒸汽泡沫的出发时分析。在气泡剥离后和立即从气泡处的温度的空间和时间变化的微尺度测量中提取到液体水中的热表面与液体水的热量。已经评估和验证了用于从固体表面的温度变化提取热通量的数值过程，并验证，并施加以研究气泡脱离阶段的热传递，并在最终泡沫剥离之后。结果证实，由离去泡沫激活的流体运动是传热增强的原因。该现象可以表征为通过前进的液体前沿在气泡基部的壁面积的干燥部分重新擦拭的过程。已经发现受观察到的传热增强机构影响的壁面积的部分是直径圆的圆形大致等于气泡偏离直径的一半。电流测量能够验证界面捕获的界面捕获数值模拟的流体动力学和单一气泡形成的热传递和从表面脱落，包括固体基质中的缀合物传热。从仿真结果中，在气泡偏离和最终泡沫剥离之后，在气泡下方和监测了气泡下方固体表面的热量的空间和时间变化。从模拟中提取的泡沫偏离的传热速率已经很好地发现了良好的测量。模拟正确捕获了实验趋势，并发现由于泡沫脱离过程引起的墙壁附近的冷液引起，对液体流动的热量幅度的精确估计。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第2期|119092.1-119092.19|共19页
  • 作者

    G. Giustini; Iljin Kim; Hyungdae Kim;

  • 作者单位

    Mechanical Engineering Department Imperial College London SW7 2AZ United Kingdom;

    Department of Nuclear Engineering Kyung Hee University Youngin Republic of Korea;

    Department of Nuclear Engineering Kyung Hee University Youngin Republic of Korea;

  • 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
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