T0501-2-4 Evaluation of Condensation Coefficient of Water in Near-equilibrium State by Shock Tube and Molecular Gas Dynamics

This study investigates the influence of the condensation coefficient of vapour on the collapse of a bubble composed of condensable gas (vapour) and non-condensable gas (NC gas). We simulated vapour and NC gas flow inside a bubble based on the molecular gas dynamics analysis in order to replicate the phase change (viz., evaporation and condensation) precisely, by changing the initial number density ratio of the NC gas and vapour, the initial bubble radius and the value of the condensation coefficient. The results show that the motion of the bubble is unaffected by the value of the condensation coefficient when that value is larger than approximately 0.4. We also discuss NC gas drift at the bubble wall during the final stage of the bubble collapse and its influence on the condensation coefficient. We conclude that vapour molecules can behave as NC gas molecules when the bubble collapses, owing to the large concentration of NC gas molecules at the gas–liquid interface. That is, the condensation coefficient reaches almost zero when the bubble collapses violently.

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Molecular Gas Dynamics of Condensation Processes of Methanol Vapor behind a Reflected Shock Wave in a Shock Tube

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B ◽

10.1299/kikaib.71.428 ◽

2005 ◽

Vol 71 (702) ◽

pp. 428-435 ◽

Cited By ~ 1

Author(s):

Takeru YANO ◽

Kazumichi KOBAYASHI ◽

Shigeo FUJIKAWA

Keyword(s):

Shock Wave ◽

Shock Tube ◽

Gas Dynamics ◽

Reflected Shock Wave ◽

Molecular Gas ◽

Methanol Vapor ◽

Reflected Shock

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Molecular gas dynamics applied to phase change processes at a vapor–liquid interface: shock-tube experiment and MGD computation for methanol

Experiments in Fluids ◽

10.1007/s00348-004-0787-1 ◽

2004 ◽

Vol 37 (1) ◽

pp. 80-86 ◽

Cited By ~ 7

Author(s):

S. Fujikawa ◽

T. Yano ◽

K. Kobayashi ◽

K. Iwanami ◽

M. Ichijo

Keyword(s):

Shock Tube ◽

Phase Change ◽

Gas Dynamics ◽

Liquid Interface ◽

Change Processes ◽

Molecular Gas ◽

Shock Tube Experiment ◽

Vapor Liquid

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Theory of Film Condensation on Shock-Tube Endwall behind Reflected Shock Wave. (Theoretical Basis for Determination of Condensation Coefficient).

JSME International Journal Series B ◽

10.1299/jsmeb.40.159 ◽

1997 ◽

Vol 40 (1) ◽

pp. 159-165 ◽

Cited By ~ 2

Author(s):

Shigeo FUJIKAWA ◽

Masanao KOTANI ◽

Nobuhide TAKASUGI

Keyword(s):

Shock Wave ◽

Shock Tube ◽

Theoretical Basis ◽

Film Condensation ◽

Reflected Shock Wave ◽

Condensation Coefficient ◽

Reflected Shock

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Black hole mass measurement in nearby galaxy using molecular gas dynamics

2016 URSI Asia-Pacific Radio Science Conference (URSI AP-RASC) ◽

10.1109/ursiap-rasc.2016.7883528 ◽

2016 ◽

Author(s):

Kyoko Onishi ◽

Satoru Iguchi ◽

Timothy Davis ◽

Martin Bureau ◽

Michele Cappellari ◽

...

Keyword(s):

Black Hole ◽

Gas Dynamics ◽

Mass Measurement ◽

Molecular Gas ◽

Nearby Galaxy ◽

Black Hole Mass

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Gas Dynamics and Active Phenomena in Galactic Nuclei: M100 and M94

International Astronomical Union Colloquium ◽

10.1017/s0252921100049861 ◽

1996 ◽

Vol 157 ◽

pp. 247-249

Author(s):

Kazushi Sakamoto ◽

Takeo Minezaki ◽

Keiichi Wada ◽

Sachiko Okumura ◽

Yukiyasu Kobayashi

Keyword(s):

Gravitational Potential ◽

Gas Dynamics ◽

Molecular Clouds ◽

Galactic Nuclei ◽

Trace Gas ◽

Molecular Gas ◽

Barred Galaxies ◽

Nir Imaging ◽

Oval Distortion

Since molecular gas fuels AGNs and molecular clouds form stars, understanding of molecular gas dynamics is a key to the understanding of active phenomena (such as starbursts and AGNs) in galactic nuclei. To study gas dynamics in weakly barred galaxies, we made CO interferometry (to trace gas) and NIR imaging (to trace stars) toward two nearby SAB galaxies M100 and M94. Each galaxy has a small stellar nuclear bar and also has an outer bar or oval distortion, thus suitable for the study of gas dynamics in a barred gravitational potential. Observations were made using Nobeyama Millimeter Array (NMA) and the IRcamera PICNIC installed at the ISAS 1.3 m telescope.

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