混合悬浮液中纳米颗粒对核化形态的影响  

THE INFLUENCE OF NANO-PARTICLES ON NUCLEATION IN MIXTURE SUSPENSION

作　　者：李春辉[1] 王补宣[1] 彭晓峰[1] 

机构地区：[1]清华大学热能系工程热物理所,北京100084

出　　处：《工程热物理学报》2004年第3期475-477,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.59995550-3)

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。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.

关 键 词：纳米颗粒 核化形态 悬浮液 均相沸腾 临界活化核心 相对分散系数 

分 类 号：TK123[动力工程及工程热物理—工程热物理]