| 混合悬浮液中纳米颗粒对核化形态的影响 |
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| 引用本文： | 李春辉,王补宣,彭晓峰.混合悬浮液中纳米颗粒对核化形态的影响[J].工程热物理学报,2004,25(3):475-477. |
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| 作者姓名： | 李春辉 王补宣 彭晓峰 |
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| 作者单位： | 清华大学热能系工程热物理所,北京,100084;清华大学热能系工程热物理所,北京,100084;清华大学热能系工程热物理所,北京,100084 |
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| 基金项目： | 国家自然科学基金(No.59995550-3) |
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| 摘 要： | 均相沸腾活化核心的形成靠液体分子(或密度)脉动形成,低过热温度下临界活化核心比纳米颗粒本身粒径要大很多,颗粒添加的影响相对很小,依旧保持为均相沸腾。随着液体过热温度的增加至临界活化核心与颗粒尺寸可比时,颗粒才有可能成为新的活化核心,液体内部的均相沸腾也转变为非均相沸腾,但在考虑颗粒吸附的情况下,颗粒的吸附会使表面部分核化中心失去活性,弱化了原有非均相核化。
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| 关 键 词： | 纳米颗粒悬浮液 均相沸腾’临界活化核心 |
| 文章编号： | 0253-231X(2004)03-0475-03 |
| 修稿时间： | 2003年12月9日 |
THE INFLUENCE OF NANO-PARTICLES ON NUCLEATION IN MIXTURE SUSPENSION |
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| LI Chun-Hui,WANG Bu-Xuan,PENG Xiao-Feng.THE INFLUENCE OF NANO-PARTICLES ON NUCLEATION IN MIXTURE SUSPENSION[J].Journal of Engineering Thermophysics,2004,25(3):475-477. |
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| Authors: | LI Chun-Hui WANG Bu-Xuan PENG Xiao-Feng |
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| Institution: | LI Chun-Hui,WANG Bu-Xuan,PENG Xiao-Feng Department of Thermal Engineering Tsinghua University,Beijing 100084,China |
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| Abstract: | The active nucleation sites for homogeneous boiling are usually induced by the fluctuation
of liquid molecules (or density). The size of critical nucleation sites is much larger than that of
nano-particles at low superheat, and consequently nano-particles have less influence on nucleation.
With increasing superheat, the nano-particles may come into being the new active sites when nano-
particles are comparable with active nucleation sites. However, the influence of nano-particles could
be weakened, with the consideration of liquid absorption on particle surface. |
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| Keywords: | Nano-particle suspension homogeneous nucleation active nucleation site |
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