On the Occurrence, Stability and Heat Transfer Enhancement of Microbubble Emission Boiling

微气泡发射沸腾的发生、稳定性及强化传热研究

基本信息

项目摘要

In subcooled boiling under certain conditions of subcooling and velocity of the liquid, the heat flux does not decrease with increasing of the surface temperature in transition boiling regime, but increases steeply. In this phenomenon a lot of minute bubbles are emitted from the surface accompanied by extraordinary loud sound. Therefore, we call this phenomenon microbubble emission boiling, abbreviated as MEB. The high heat flux in MEB far exceeding CHF should be considered a result of violent growing and collapsing behavior of coalescent bubbles in that region, which strongly introduces subcooled liquid to the heated surface.In this study, the liquid temperature profiles were measured at the process of growing and collapsing of bubbles separately with conditional sampling method, by using a thermocouple set at a suitable position above the center of the surface as a detecting prove of bubble motion. In the period of bubble collapse, the high temperature appeared only on the central pa … More rt of the surface. This high temperature region indicates the position of high provability for vapor phase to have existed, suggesting that the bubbles shrink and collapse toward the center on the surface. Here, we tried to get an information about the moving velocity of liquid-vapor interface in the bubble shrinking stage near the moment of collapse, which was named as the collapsing velocity, here, with a twin electrode void probe. The velocity was very high in MEB comparing with that of nucleate boiling. In MEB, the collapsing velocity increased with increasing of the heat flux, to be as much as 20 m/s at 20 MW/sq.m in the heat flux.The bubble motion can be monitored directly by an electrode void probe. The frequency of the fluctuation of the void signal indicates the frequency of the chance of liquid supply onto the surface. Therefore, the peak frequency of the power spectrum of the void signal fluctuation should be an index of heat transfer, and heat flux must be a function of the frequency. The relation between the peak frequency and heat flux was obtained for various condition of liquid subcooling and velocity. Though the data showed a wide scattering, a trend of higher peak frequency is distinguished in lower liquid subcooling. It was rearranged for excess heat flux from CHF, to get a correlation function. Less
在过冷沸腾中,在一定的过冷度和液体流速条件下,过渡沸腾区的热通量并不随着表面温度的升高而降低,而是急剧增加。在这种现象中,许多微小的气泡从表面喷出,并伴随着异常响亮的声音。因此,我们把这种现象称为微泡发射沸腾,简称MEB。 MEB中远超过CHF的高热通量应被认为是该区域聚结气泡剧烈生长和破裂行为的结果,它将过冷液体强烈引入到受热表面。本研究通过条件采样方法,利用设置在表面中心上方适当位置的热电偶分别测量气泡生长和破裂过程中的液体温度分布,作为气泡运动的检测证据。在气泡破裂期间,高温仅出现在表面的中心部分。这个高温区域表明气相存在的可能性很高,表明气泡向表面中心收缩和破裂。在这里,我们试图用双电极空洞探针来获取气泡收缩阶段接近崩溃瞬间的液汽界面移动速度的信息,这里将其称为崩溃速度。与核态沸腾相比,MEB 中的速度非常高。在MEB中,塌陷速度随着热通量的增加而增加,在热通量为20 MW/sq.m时高达20 m/s。气泡运动可以通过电极空隙探针直接监测。空隙信号波动的频率表示液体供给到表面的机会的频率。因此,虚空信号波动功率谱的峰值频率应该是传热的指标,而热通量必然是频率的函数。获得了不同液体过冷度和速度条件下峰值频率与热通量之间的关系。尽管数据显示出广泛的分散性,但在较低的液体过冷度中可以看出较高的峰值频率的趋势。针对 CHF 的多余热通量对其进行了重新排列,以获得相关函数。较少的

项目成果

期刊论文数量(16)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Satoshi KUMAGAI: "Heat Transfer Mechanism Based on Temperature Profiles and Bubble Motion in Microbubble Emission Boiling"Proc.6th ASME-JSME Thermal Engineering Joint Conference. TED-AJ03-219. 1-8 (2003)
Satoshi KUMAGAI:“微泡发射沸腾中基于温度分布和气泡运动的传热机制”Proc.6th ASME-JSME 热工联合会议。
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Y.Usuda, S.Kumagai, T.Kobayashi: "Stability of Microbubble Emission Boiling"Proc. 39th National Heat Transfer Conference of Japan. Vol.1. 173-174 (2002)
Y.Usuda,S.Kumagai,T.Kobayashi:“微泡发射沸腾的稳定性”Proc。
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S.KUMAGAI, T.Uhara, T.Nakata, M.Izumi: "Liquid-Solid Contact in Microbubble Emission Boiling through Void Signals"Transaction of the Japan Society of mechanical Engineers. 67-661. 154-160 (2001)
S.KUMAGAI、T.Uhara、T.Nakata、M.Izumi:“通过空信号进行微泡发射沸腾中的液固接触”日本机械工程师学会会刊。
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熊谷・兎原・中田・泉: "気泡微細化沸騰におけるボイド信号に基づく固液接触の考察"日本機械学論文集B編. 67巻661号. 2304-2310 (2001)
Kumagai、Usahara、Nakata、Izumi:“基于气泡细化沸腾中的空隙信号的固液接触研究”日本机械工程学报 B,第 67 卷,第 661 期。2304-2310 (2001)
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小林 武: "気泡微細化沸騰の不安定領域における気泡挙動"日本機械学会東北支部第39期秋期講演会講演論文集. No.031-2. 101-102 (2003)
小林武:“气泡细化沸腾的不稳定区域中的气泡行为”日本机械工程学会东北分会第39届秋季会议论文集第031-102号(2003年)。
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KUMAGAI Satoshi其他文献

KUMAGAI Satoshi的其他文献

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{{ truncateString('KUMAGAI Satoshi', 18)}}的其他基金

A study on Innovation Enabling Management Method
创新赋能管理方法研究
  • 批准号:
    16510124
  • 财政年份:
    2004
  • 资助金额:
    $ 2.24万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
On the Bubble Behavior and Heat Transfer Mechanism in Microbubble Emission Boiling
微气泡发射沸腾中的气泡行为及传热机理研究
  • 批准号:
    09650219
  • 财政年份:
    1997
  • 资助金额:
    $ 2.24万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
On the Heat Transfer Mechanism and Stability of High Heat Flux Microbubble Emission Boiling
高热通量微泡发射沸腾传热机理及稳定性研究
  • 批准号:
    05805021
  • 财政年份:
    1993
  • 资助金额:
    $ 2.24万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
Mechanism and Optimization of Enhancement of Filmwise Condensation Heat Transfer by Coexistence With Dropwise Condensation Sections
滴状冷凝段共存增强膜式冷凝传热机理及优化
  • 批准号:
    02650144
  • 财政年份:
    1990
  • 资助金额:
    $ 2.24万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
High Performance Cooling with Boiling Heat Transfer in Confined or Low Level Water Space
在密闭或低位水空间中通过沸腾传热进行高性能冷却
  • 批准号:
    63550151
  • 财政年份:
    1988
  • 资助金额:
    $ 2.24万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
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