Condensation Process of Gaseous Molecules on Thermal and Chemical Active Surfaces

气态分子在热活性和化学活性表面上的冷凝过程

• 批准号: 63460103
• 负责人: SANO Taeko
• 金额: $ 2.3万
• 依托单位: Tokai University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63460103/
• 关键词: Gaseous condensation; Molecular dynamics; Numerical simulation; Heterogeneous condensation; Cluster distribution; Vacuum chamber; 蒸着膜厚の時間変化; 凝縮速度への圧力依存性; 固体壁面への凝縮; 新素材の生成; 金属の蒸発; 電子ビーム

The condensation process of gaseous molecules of argon on their condensate is studied numerically by using the molecular dynamics method with the Lennard-Jones (6-12) potential. Further, the heterogeneous condensation process by metallic (Ti, Zr, Fe, Co, Cu and Ag) and nonmetallic (C and Si) vapors on solid surfaces is also studied experimentally in vacuum chamber to investigate the effect of their cluster distribution on the condensation process.(1) Any evidence of significant interfacial surface structure is not shown in the results, but inside the condensate ordered structures are observed.(2) The warmer molecules coming into the condensate concentrate more densely near the interface than the cooler molecules accumulating around the interface.(3) The energy flows of condensation and evaporation have a peak just inside the interface of phase change.(4) The concentration of cluster in metallic vapors are fairly high, that is, their number density is not less than that of monomer.(5) The thickness of films made by metallic vapors increases proportionally to time, which means condensation rate is nearly constant, while the thickness of nonmetallic films does not increase linearly.(6) The condensate rate of iron (Fe) increases with the decrease in chamber pressure.

采用分子动力学方法，利用Lennard-Jones（6-12）势数值研究了气态氩气分子在冷凝物上的冷凝过程。此外，还在真空室内实验研究了金属（Ti, Zr, Fe, Co， Cu和Ag）和非金属（C和Si）蒸气在固体表面的非均相冷凝过程，考察了它们的团簇分布对冷凝过程的影响。(1)结果没有显示出明显的界面表面结构，但在凝结水内部观察到有序结构。(2)进入冷凝液的温度较高的分子在界面附近的集中程度高于聚集在界面周围的温度较低的分子。(3)凝结和蒸发的能量流在相变界面内有一个峰值。(4)金属蒸气中团簇的浓度相当高，即它们的数目密度不小于单体。(5)金属蒸汽形成的薄膜厚度随时间成比例增加，即凝结速率几乎恒定，而非金属蒸汽形成的薄膜厚度不呈线性增加。(6)随着腔压的降低，铁（Fe）的凝结率增大。

项目成果

T.Sano, S.Kotake,: Proc.16 th Int Symp a Rarebied Gas Dynamis. (1988)

T.Sano，S.Kotake，：Proc.16 th Int Symp a Rarebied Gas Dynamis。

Sano, Taeko: "Heterogeneous Condensation of Metallic and Nonmetallic Vapors." Research Reports: Fund for basic experiments oriented to space station utilization from Institute of Space and Astronautical Science, 1990.

Sano, Taeko：“金属和非金属蒸气的非均相冷凝。”

佐野妙子,高本慶二: "固体表面での気体凝縮" 宇宙基地利用基礎実験費成果報告書,宇宙科学研究所. (1990)

Taeko Sano、Keiji Takamoto：“固体表面上的气体凝结”空间基地利用的基本实验费用报告，空间与宇航科学研究所（1990）。

佐野妙子: "Molecular Dynamics Studies on condensation Process of Argon." Progress in Astronautics and Aeronautics.vol.117. 439-445 (1989)

佐野妙子：“氩气凝结过程的分子动力学研究。”航天与航空进展，第 439-445 卷（1989 年）。

佐野妙子: "固体表面で気体凝縮" 宇宙基地利用基礎実験費成果報告書,宇宙化学研究所(発表予定). (1990)

佐野妙子：“固体表面上的气体凝结”空间基地利用基础实验资助报告，空间化学研究所（待提交）。