加热丝上核态沸腾时汽泡间的热相互作用
Interaction between Boiling Bubbles on a Heated Wire
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摘要: 本文分析讨论加热丝上汽泡生长过程中加热丝的温度变化特征,揭示一个活化核心的起泡对周围其他活化核心起泡过程以及其自身的影响,进而讨论两个核心之间起泡的相关性。分析还发现由于汽泡生长造成的局部温度下降是加热丝表面沸腾需要较高过热度的一个重要原因。通过对温度场的计算,模拟了两个临近核心之间的热相互作用,得出一些有益的结论。Abstract: When the bubbles grow from the surface of heated wall,violent interaction takes place among them.Disturbance in temperature field plays a key role by affecting forming and growing of bubbles.The relationship between bubbles and temperature distribution of a heated thread was analyzed.The physical models and mathematic descriptions were proposed to understand the mechanism of interaction among bubbles.The temperature sharp decrease was found to greatly depress the bubble generation in the adjacent region.The observation indicated that boiling on a wire and boiling on wall are different.Bubble can cause major temperature decrease on a thread.This kind of temperature decease even breaks off bubble growing and/or generation.It is an important reason for higher superheat of boiling on a thread due to its weaker capability of heat conduction.Finally,computer simulation was carried out and some new aspects were observed.
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Key words:
- nucleate boiling /
- heated wire /
- temperature field /
- bubble interaction /
- computer simulation
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