Abstract
In highly rarefied gas flows, there appear nonequilibrium phenomena not only between translational and rotational energy modes (non-equipartition) but also deviation of rotational energy distribution from the Boltzmann distribution. To analyze these highly rarefied gas flows, we established the experimental system for 2R + 2 N2-REMPI and applied it to the measurement of rotational temperature in a supersonic free molecular flow of nitrogen. In this study, a strong nonequilibrium in rotational energy mode has been found in a nitrogen free molecular flow. The data in the Boltzmann plot, obtained from the measured REMPI spectra, cannot be fitted by one line but approximately by two lines, revealing the non-Boltzmann distribution of rotational energy in the ground state. The mechanism of the deviation from the Boltzmann distribution is also discussed using the state-to-state transition rates for collisional relaxation.
| Original language | English |
|---|---|
| Pages (from-to) | 623-629 |
| Number of pages | 7 |
| Journal | Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B |
| Volume | 69 |
| Issue number | 679 |
| DOIs | |
| Publication status | Published - Jan 1 2003 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanical Engineering
Cite this
A study on an analysis of non-equilibrium of rotational temperatures in supersonic free molecular flows by REMPI. / Mori, Hideo; Niimi, Tomohide; Niwa, Kenji; Akiyama, Isao.
In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 69, No. 679, 01.01.2003, p. 623-629.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - A study on an analysis of non-equilibrium of rotational temperatures in supersonic free molecular flows by REMPI
AU - Mori, Hideo
AU - Niimi, Tomohide
AU - Niwa, Kenji
AU - Akiyama, Isao
PY - 2003/1/1
Y1 - 2003/1/1
N2 - In highly rarefied gas flows, there appear nonequilibrium phenomena not only between translational and rotational energy modes (non-equipartition) but also deviation of rotational energy distribution from the Boltzmann distribution. To analyze these highly rarefied gas flows, we established the experimental system for 2R + 2 N2-REMPI and applied it to the measurement of rotational temperature in a supersonic free molecular flow of nitrogen. In this study, a strong nonequilibrium in rotational energy mode has been found in a nitrogen free molecular flow. The data in the Boltzmann plot, obtained from the measured REMPI spectra, cannot be fitted by one line but approximately by two lines, revealing the non-Boltzmann distribution of rotational energy in the ground state. The mechanism of the deviation from the Boltzmann distribution is also discussed using the state-to-state transition rates for collisional relaxation.
AB - In highly rarefied gas flows, there appear nonequilibrium phenomena not only between translational and rotational energy modes (non-equipartition) but also deviation of rotational energy distribution from the Boltzmann distribution. To analyze these highly rarefied gas flows, we established the experimental system for 2R + 2 N2-REMPI and applied it to the measurement of rotational temperature in a supersonic free molecular flow of nitrogen. In this study, a strong nonequilibrium in rotational energy mode has been found in a nitrogen free molecular flow. The data in the Boltzmann plot, obtained from the measured REMPI spectra, cannot be fitted by one line but approximately by two lines, revealing the non-Boltzmann distribution of rotational energy in the ground state. The mechanism of the deviation from the Boltzmann distribution is also discussed using the state-to-state transition rates for collisional relaxation.
UR - http://www.scopus.com/inward/record.url?scp=0037603653&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0037603653&partnerID=8YFLogxK
U2 - 10.1299/kikaib.69.623
DO - 10.1299/kikaib.69.623
M3 - Article
AN - SCOPUS:0037603653
VL - 69
SP - 623
EP - 629
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
SN - 0387-5016
IS - 679
ER -