A Molecular Fluiddynamical Study of Phase Change Phenomena of a Vapor in a Wide Range of Themally Non-equilibrium State

大范围热非平衡状态下蒸气相变现象的分子流体动力学研究

• 批准号: 11650184
• 负责人: FUJIKAWA Shigeo
• 金额: $ 2.37万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650184/
• 关键词: Molecular Fluiddynamics; Molecular Dynamics; Shock Wave; Vapor; Phase Change; Condensation; Evaporation; Condensation Coefficient; 凝縮機構; 分子動力学法

This paper aims to determine the condensation coefficient of methanol vapor under vapor-liquid nonequilibrium states. A shock tube avaiable in a state from initially normal to high temperatures has been made and it is used for the measurement of the growth of a liquid film formed on the endwall surface of the tube in a shock wave reflection region. It is found that the shock tube satisfies requirements for the experiment and the liquid film grows uniformly on the wall surface in a wide range of temperatures of liquid film and vapor.The condensation coefficient of methanol vaporn has been determined from the growth of liquid films at initially normal temperatures(286.3K〜299.6K) and higher ones(323.3K〜324.4K). It is clarified that the condensation coefficient is strongly dependent on both the ratio of vapor and liquid film temperatures and the ratio of number densities of vapor and saturated vapor at the vapor -liquid interface.For the same temperature and number density ratios, the higher is the liquid film temperature, the smaller becomes the condensation coefficient, and it decreases with the increase of the number density ratio. The condensation coefficient becomes large as the both ratios approach to unity, that is,the state does to an equilibrium one.

本文旨在确定汽液非平衡状态下甲醇蒸气的冷凝系数。研制了一种从初始正常温度到高温状态的激波管，用于测量激波反射区管内端壁面形成的液体膜的生长情况。结果表明，该激波管满足实验要求，在较宽的液膜和汽温范围内，液膜在壁面均匀生长。通过初始常温（286.3K ~ 299.6K）和更高温度（323.3K ~ 324.4K）下液膜的生长，测定了甲醇蒸气的冷凝系数。结果表明，冷凝系数在很大程度上取决于汽液膜温度比和汽液界面处蒸汽与饱和蒸汽的数密度比。在温度和数密度比相同的情况下，液膜温度越高，冷凝系数越小，并随着数密度比的增大而减小。当两者的比值趋于一致时，即状态趋于平衡时，冷凝系数变大。

项目成果

井奈波晃 他2名: "メタノール蒸気の凝縮係数の温度依存性に関する研究"日本機械学会流体工学部門講演会講演論文集. No.99-19. 107-108 (1999)

Akira Inaha 等 2 人：“甲醇蒸气冷凝系数的温度依赖性研究”日本机械工程学会会议录，流体工程学部第 99-108 号（1999 年）。

藤川重雄 他1名: "混相流体の諸現象と界面の物理"日本機械学会論文集(B). 68-671(未定). (2002)

Shigeo Fujikawa 等 1：“多相流体现象和界面物理”，日本机械工程师学会汇刊 (B) 68-671 (TBD)。

Abe, T. et al.: "A Study of Condensation Coefficient of Methanol Vapor at High Temperature"Proc. of JSME Annual Meeting. IV. 159-160 (1999)

Abe, T. 等人：“高温下甲醇蒸气冷凝系数的研究”Proc。

阿部稔弘 他3名: "高温状態でのメタノール蒸気の凝縮係数に関する研究"日本機械学会1999年度年次大会講演論文集. IV. 159-160 (1999)

Toshihiro Abe等3人：“高温下甲醇蒸气的冷凝系数的研究”日本机械工程学会1999年年会论文集IV 159-160。

Fujikawa, S. et al.: "The MD Simulation of Phase Change Processes of Methanol"Proc. of 14th Comp. Mech. of JSME. No. 01-10. 581-582 (2001)

Fujikawa, S. 等人：“甲醇相变过程的 MD 模拟”Proc。