Mechanism of Heat Transfer Enhancement of Air-Water Dispersed Flow in a Pipe

管道内空气-水分散流强化传热机理

基本信息

  • 批准号:
    08650244
  • 负责人:
  • 金额:
    $ 1.41万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    1996
  • 资助国家:
    日本
  • 起止时间:
    1996 至 1997
  • 项目状态:
    已结题

项目摘要

The mechanism of the heat transfer enhancement of an air-water dispersed flow in a heated vertical pipe has been studied. By simultaneous multi-point measuremetns.a quite large amplitude and a very low frequnce of wall-temperature fluctuations that were completely different from those reported previously for single-component two-phase flows, were observed and were found to be caused by the meandering motion of rivulet-like liquid film on the wall. The water film thickness under heating and no heating was measured by using the conductance probe method, and showed a good agreement with the analytical results for laminar water film. The critical water-film thickness was measured as the breakdown thickness of the uniform film, and the correlation between the critical thickness and the friction velocity was in good agreement with previous studies. A numerical analysis for simulating the heat transfer mechanism was made by taking into account the evaporative heat transfer from the liquid film that covers the wall surface uniformly or partially in circumference as a rivulet-like liquid film. The present analytical results agreed well with the measured wall temperature in the uniform liquid film region, where the rate of heat transfer was approxi-mately seven times higher thanthat for a single-phase air flow. This enhancement was found to be mainly due to the evaporation of teh water film. It was demonstrated that the numerical analysis for the rivulet-like liquid film region predicted well the maximum range of wall-temperature fluctuatins observed experimentally. It was also shown that the critical water-film thickness determined by the present analysis was correlated well with the friction velocity of the liquid-gas interface of the uniform liquid film.
本文研究了垂直加热管内空气-水分散流的强化传热机理。通过多点同时测量,观察到了与以往报道的单组分两相流完全不同的壁温波动的很大幅度和很低的频率,并发现这是由壁面上细流状液膜的曲折运动引起的。用电导探针法测量了加热和不加热条件下的水膜厚度,与层流水膜的分析结果吻合较好。临界水膜厚度作为均匀膜的破裂厚度,临界水膜厚度与摩擦速度之间的相关性与前人的研究结果一致。考虑壁面上均匀或局部周向覆盖液膜的液膜蒸发换热,对传热机理进行了数值模拟分析。在均匀液膜区,传热速率比单相空气流高约1.7倍,本文的分析结果与实测壁温吻合得很好。这种增强主要是由于水膜的蒸发。结果表明,对细流状液膜区的数值分析能很好地预测实验观察到的壁温波动的最大范围。计算结果还表明,由本文分析确定的临界水膜厚度与均匀液膜的液-气界面摩擦速度有很好的相关性。

项目成果

期刊论文数量(12)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
橘信仁,鳥居薫,西野耕一,北川哲也,新井達紀: "空気-水系噴霧流における液膜挙動に関する研究." 第35回日本伝熱シンポジウム講演論文集.
Nobuhito Tachibana、Kaoru Torii、Koichi Nishino、Tetsuya Kitakawa、Tatsunori Arai:“第 35 届日本传热研讨会论文集”。
  • DOI:
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    0
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  • 通讯作者:
橘 信仁, 鳥居 薫, 西野 耕一, 北川 哲也, 新井 達紀: "空気-水系噴霧流における液膜挙動に関する研究." 第35回日本伝熱シンポジウム講演論文集. (未定).
Nobuhito Tachibana、Kaoru Torii、Koichi Nishino、Tetsuya Kitakawa、Tatsunori Arai:“第 35 届日本传热研讨会论文集”。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
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北川哲也,鳥居薫,西野耕一: "垂直管内空気-水系噴霧流熱伝達" 日本機械学会論文集(B編). 63-608. (1997)
Tetsuya Kitakawa、Kaoru Torii、Koichi Nishino:“垂直管道中空气-水喷雾流的传热”,日本机械工程师学会会刊(编辑 B)(1997 年)。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
北川 哲也, 鳥居 薫, 西野 耕一: "垂直管内空気-水系噴霧流熱伝達" 日本機械学会論文集(B編). 63巻608号. 1359-1366 (1997)
Tetsuya Kitakawa、Kaoru Torii、Koichi Nishino:“垂直管道中空气-水喷雾流的传热”,日本机械工程师学会会刊(B 版),第 608 卷。1359-1366(1997 年)。
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    0
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TORII Kahoru其他文献

TORII Kahoru的其他文献

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{{ truncateString('TORII Kahoru', 18)}}的其他基金

Simultaneous Heat-Transfer Augmentation and Pressure-Loss Reduction of Fin-Tube Heat Exchanger by Means of Vortex Generators
利用涡流发生器同时增强翅片管换热器的传热和降低压力损失
  • 批准号:
    14350104
  • 财政年份:
    2002
  • 资助金额:
    $ 1.41万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Study on the Dynamic Thermal Contact Resistance and Its Evaluation
动态接触热阻的研究及其评价
  • 批准号:
    12650195
  • 财政年份:
    2000
  • 资助金额:
    $ 1.41万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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