1993 Fiscal Year Final Research Report Summary
Molecular Study of Phase Transition Phenomena at Vapor-Liquid Interface
| Project/Area Number |
04805018
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Fluid engineering
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| Research Institution | Toyama Prefectural University |
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Principal Investigator |
FUJIKAWA Shigeo Toyama Prefectural University, Department of Mechanical Systems Engineering, Associate Professor, 工学部, 助教授 (70111937)
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| Co-Investigator(Kenkyū-buntansha) |
LEE Senki Toyama Prefectural University, Department of Mechanical Systems Engineering, Res, 工学部, 助手 (90232107)
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| Project Period (FY) |
1992 – 1993
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| Keywords | Molecular fluid dynamic / Shock-tube / Shock wave / Phase transition / Evaporation / Condensation / Sticking probability / Condensation coefficient |
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| Research Abstract |
A shock-tube was applied to the study of vapor-liquid phase transition in the following way : A vapor is filled in a low pressure chamber and it is compressed and heated by the reflection of a shock wave at the endwall of the shock-tube. Then, the vapor begins to condense in the form of a liquid film on the endwall because of the large difference in heat capacities of the vapor and the endwall.
In the present work, interests were focussed on the following problems :
(1)Phase transition rate from the vapor to the liquid at vapor-liquid interface
(2)Sticking probablity of vapor molecules at vapor-liquid interface
New optical methods for the measurement of the phase transitio rate and the stiking probability were developed. Laser differential interferometry was also used to measure density change and uniformity of the vapor behind rhe reflected shock wave. A theoretical analysis on the reflection of the shock wave at the endwall and on the growth of the liquid film was performed on the basis of singular perturbation method.
From the comparison betweenm experimantal results of liquid film growth and theoretival analyzes, the sticking probabaility of menthanol vapor molecules was obtained. The most probable value of the sticking probability of methanol vapor was found to be about 0.3(290K), and it was in rather good agreement with predicted values(0.2-0.3)obtained by computer simulation based on molecular dynamics.
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