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Transient Temperature of Liquid on Micro Metal LayerHeated by Pulsed Laser

Journal of Thermal Science 1999年第2期8卷 125-130页

作者： Li Ji Zhang Zhengfang Liu Dengging(Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China) Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing China

In this paper the transient temperature of liquid on micro metal layer heated by pulsed high energy laser is simulatedby numerical method, especially around the theoretical homogeneous boiling point(THBP). The relationshipbetween temperature rising rate and laser fiuence is obtained; and under different temperature rising rate thedistributions of temperature in liquid and metal around the THBP are obtained. With numerical simulation therelation between the temperatUre rising rate and laser parameters (fluence and pulse width) is known and so in thefuture the rapid transient boiling phenomenon could be studied and analyzed.

关键词： homogeneous boiling heat conduction numerical method.

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Self-aggregation of vapor-liquid phase transition

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Progress in Natural Science:Materials International 2003年第6期 53-58页

作者： WANG Xiaodong, TIAN Yong and PENG Xiaofeng(Department of Thermal Engineering, Tsinghua University, Beijing 100084, China) Department of Thermal Engineering Tsinghua University Beijing 100084 China

The concept of the molecular free path is introduced to derive a criterion distinguishing active molecules from inactive molecules in liquid phase. Based on molecular self-aggregation theory a concept of the critical aggregation concentration (CAC) of active molecules is proposed to describe the physical configuration before the formation of the nuclei in the process of vapor-liquid phase transition. All active molecules exist in the form of the monomer when the concentration of active molecules is lower than CAC, while the active molecules will generate aggregation once the concentration of the active molecules reaches CAC. However, these aggregates with the aggregation number N smaller than 5 can steadily exist in bulk phase. The other excess active molecules can only produce infinite aggregation and form a critical nucleus of vapor-liquid phase transition. Without outer perturbation the state point of CAC corresponds to the critical superheated or supercooled state in the process of vapor-liquid phas

关键词： homogeneous boiling free path active molecule self-aggregation critical aggregation concentration nucleation rate.

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