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首页> 外文期刊>International Journal of Heat and Mass Transfer >A mechanistic model for predicting the maximum diameter of vapor bubbles in a subcooled boiling flow
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A mechanistic model for predicting the maximum diameter of vapor bubbles in a subcooled boiling flow

机译：预测过冷沸腾流中气泡最大直径的机械模型

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摘要

Vapor bubbles attached to the heated surface in a subcooled boiling flow usually reach their maximum size during the latter phase of the bubble growth period when the liquid microlayer trapped under them is almost depleted. The heat transfer at the bubble during this phase involves only the transient heat conduction through a so-called relaxation microlayer surrounding the lower bubble surface and the condensation at the bubble dome. On this physical base, a new mechanistic model for predicting the maximum diameter of attached vapor bubbles in a subcooled boiling flow is proposed in this study. The new model is derived from the lumped energy balance for the bubbles. It is then validated using published experimental databases on the maximum bubble diameter measured for subcooled boiling flows of water under a wide range of flow conditions. A good agreement between the predicted maximum bubble diameter and the experimental one is obtained. The average relative error is less than about 35.5%. This model is expectedly worthy of being used in the analysis of subcooled boiling flows.
机译：在过冷沸腾流中附着在加热表面上的蒸气气泡通常在气泡生长阶段的后期达到最大尺寸，这时捕获在其下方的液体微层几乎被耗尽。在该阶段，气泡处的热传递仅涉及通过围绕下部气泡表面的所谓弛豫微层的瞬时热传导以及气泡穹顶处的冷凝。在此物理基础上，本研究提出了一种新的机制模型，用于预测过冷沸腾流中附着的蒸汽气泡的最大直径。新模型是从气泡的集总能量平衡中得出的。然后，使用已发布的实验数据库对在各种流量条件下过冷沸腾的水所测得的最大气泡直径进行验证。在预测的最大气泡直径和实验值之间获得了很好的一致性。平均相对误差小于约35.5％。该模型有望用于过冷沸腾流分析。

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  • 作者

    Nhan Hien Hoang; In-Cheol Chu; Dong-Jin Euh; Chul-Hwa Song;

  • 作者单位

    University of Science and Technology, 217 Gajungro, Yuseong-gu, Daejeon, Republic of Korea,Korea Atomic Energy Research Institute, Daedeok-daero 989-111, Yuseong-gu, Daejeon, Republic of Korea;

    Korea Atomic Energy Research Institute, Daedeok-daero 989-111, Yuseong-gu, Daejeon, Republic of Korea;

    University of Science and Technology, 217 Gajungro, Yuseong-gu, Daejeon, Republic of Korea,Korea Atomic Energy Research Institute, Daedeok-daero 989-111, Yuseong-gu, Daejeon, Republic of Korea;

    University of Science and Technology, 217 Gajungro, Yuseong-gu, Daejeon, Republic of Korea,Korea Atomic Energy Research Institute, Daedeok-daero 989-111, Yuseong-gu, Daejeon, 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
  • 中图分类
  • 关键词

    Maximum bubble diameter; Subcooled flow boiling; Mechanistic model; Relaxation microlayer;

    机译：最大气泡直径;过冷流沸腾;机械模型;弛豫微层;

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