Molecular Study on Phase Transition of Fluid by a Shock Tube

激波管流体相变的分子研究

• 批准号: 06805018
• 负责人: FUJIKAWA Shigeo
• 金额: $ 1.47万
• 依托单位: Toyama Prefectural University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06805018/
• 关键词: Molecular fluid dynamics; Molecular dynamics; Shock wave; Vapor; Phase transition; Condensation; Evaporation; Condensation coefficient

The present in vestigators have developed a new method to make a simultaneous measurement of both the phase-transition rate from a vapor to liquid phase and the vapor temperature in a thermodynamic nonequilibrium condition at the vapor-liquid interface.Focussing on the rapid growth of the liquid film formed on the shock tube endwall behind a reflected shock wave, the phase-transition from the vapor to liquid phase and the vapor temperature at the interface have been measured by using optical methods. The phasetransition of methanol vapor and the temperature have been measured from energy reflectance of lights which varies with changes of the liquid film thickness and of the refractive index of the vapor at the interface. A thoeritical analysis of the liquid film growth has also been made by solving one-dimensional gas dynamics equations for the vapor and thermal equations for the liquid film and the endwall. The condensation coefficient of the methanol vapor has been deduced from the conformity between the experiment and the theory.It has been clarified that the condensation coefficient is greatly influenced by thermodynamic states of the vapor, e.g., supersaturated, saturated and superheated states. This phenomenon has been explained by the introduction of the concept of molecular exchange between vapor and liquid. The present results are found to be in good agreement with those of molecular dynaics computer simulation of dynamical processes of evaporation and cindensation.

目前研究人员开发了一种在汽液界面热力学非平衡条件下同时测量汽相到液相的相变速率和汽相温度的新方法。 使用光学方法测量了界面。甲醇蒸气的相变和温度是通过光的能量反射率来测量的，该能量反射率随着液膜厚度和界面处蒸气的折射率的变化而变化。通过求解蒸汽的一维气体动力学方程以及液膜和端壁的热方程，还对液膜生长进行了理论分析。从实验与理论的一致性推导了甲醇蒸气的冷凝系数，阐明了甲醇蒸气的冷凝系数受蒸气的过饱和、饱和、过热等热力学状态的影响较大。这种现象可以通过引入蒸气和液体之间分子交换的概念来解释。发现目前的结果与蒸发和冷凝动力学过程的分子动力学计算机模拟结果非常一致。

项目成果

S.Fujikawa, M.Kotani and N.Takasugi: "Theory of Film Condensation on Shock Tube Endwall behind Reflected Shock Wave (A Subsequent Repert, Theoretical Basis for Determination of Condensation Coefficient) (in Japanese)" Trans.JSME. (in press.). (1996)

S.Fujikawa、M.Kotani 和 N.Takasugi：“反射冲击波后面激波管端壁上的薄膜凝结理论（随后的报告，确定凝结系数的理论基础）（日语）”Trans.JSME。

S.Fujikawa,M.Matsumoto,M.Kotani,H.Sato: "Experiments of Vapor-Liquid Phase Transition in a Shock Tube" Proc.of IUTAM Symp.on Waves in Liquid/Gas and Liquid/Vapor Two-Phase System. Vol.1. 355-364 (1994)

S.Fujikawa，M.Matsumoto，M.Kotani，H.Sato：“激波管中的汽-液相变实验”Proc.of IUTAM Symp.on 液/气和液/汽两相系统中的波。

藤川重雄: "会合性液体の蒸発・凝縮現象に関する分子論的研究" 日本機械学会論文集(B). 61. 215-222 (1995)

Shigeo Fujikawa：“缔合液体蒸发和凝结现象的分子研究”日本机械工程学会会刊（B）61。215-222（1995）。

藤川重雄・小谷正直,高杉信秀: "衝撃波の反射領域・衝撃波管管端面での蒸気の膜状凝縮理論 (続報,凝縮係数決定の理論的根拠)" 日本機械学会論文集(B). 第62巻(掲載予定). (1996)

Shigeo Fujikawa、Masanao Kotani、Nobuhide Takasugi：“冲击波反射区和冲击波管端面的蒸汽薄膜状冷凝理论（后续报告，确定冷凝系数的理论基础）” 日本学会汇刊机械工程师（B）第62卷（待出版）。

藤川重雄: "衝撃波の反射領域・領域波管管端面での蒸気の膜状凝縮理論" 日本機械学会論文集(B). 61. 635-643 (1995)

Shigeo Fujikawa：“波管端面蒸气膜状冷凝的冲击波反射区域/区域理论”日本机械工程师学会会刊（B）61. 635-643（1995）。