| 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： | 2003-12-09 |
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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| Affiliation: | 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 fluctuationof liquid molecules (or density). The size of critical nucleation sites is much larger than that ofnano-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 couldbe 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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