Particle Composition of CO2-CF3I Mixture at Temperatures of 300-30,000 K

Yokomizu, Yasunobu; Ochiai, Ryusuke; Matsumura, Toshiro

doi:10.1541/ieejpes.127.1281

Cited by 4 publications

(7 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the determination of n j under the constant‐pressure condition, the same particle species as listed in Section 2.1.1 were taken into consideration. On the other hand, we have so far determined the particle compositions of several high‐temperature gases under a constant‐pressure situation ,. Determinations were based on the numerical solution of the Guldberg‐Waage and Saha equations expressing the dissociation and ionization reactions of the particles, on assumption of establishment of thermal equilibrium.…”

Section: Discussion On Formula Expressing Relationship Between Constamentioning

confidence: 99%

See 1 more Smart Citation

Particle composition and heat capacity of high‐temperature SF₆ present at constant volume: Discussion on formula expressing relationship between constant‐pressure and constant‐volume heat capacities

Yokomizu

Kobayashi

Matsumura

2015

IEEJ Transactions Elec Engng

Self Cite

View full text Add to dashboard Cite

Until now, the high‐temperature properties of SF6 have been derived as a function of T for a given constant pressure P. This was based on the adoption of T and P as gas state parameters. In contrast, this paper adopts T and the gas volume V as the gas state parameters and then evaluates the particle composition and gas pressure for high‐temperature SF6 present at a constant volume state. This evaluation is achieved by the minimization of Helmholtz free energy of the high‐temperature SF6. A further derivation for the SF6 gas at constant volume is performed to reveal the temperature dependence of the molar heat capacity CVm [J/(mol·K)] and the specific heat CVg [J/(kg·K)]. Use of the obtained CVm enabled us to discuss whether the formula CPm−CVm=Rm holds true for the high‐temperature SF6 or not, where CPm and Rm are the molar heat capacity at constant pressure and the universal gas constant, respectively. Similar discussion is also performed on the formula indicating the relation between CPg and CVg, where CPg is the specific heat at constant pressure. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

show abstract

Section: Discussion On Formula Expressing Relationship Between Constamentioning

confidence: 99%

“…1(a) that, whereas scarcely showing a dissociation reaction at 300, 500, and 1000 K, SF 6 reveals an active dissociation reaction to the other particles at 1800 K or above. This leads to the following essential interpretation: (10) and (17) hold true for the gas composed of the original species SF 6 .…”

Section: Suggestion Some Situations May Require Researchersmentioning

confidence: 99%

Particle composition and heat capacity of high‐temperature SF₆ present at constant volume: Discussion on formula expressing relationship between constant‐pressure and constant‐volume heat capacities

Yokomizu

Kobayashi

Matsumura

2015

IEEJ Transactions Elec Engng

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is useless to define the relative insulation strength in highly nonuniform electric field generally, and analysis according to specific pressure condition is necessary [5]. [7]. It can be indicated that the insulation strength of CF 3 I-N 2 gas mixtures relative to SF 6 -N 2 declines gradually with the increase of pressure, but the breakdown level is always more than 55% of SF 6 .…”

Section: Comparison Of Cf 3 I and Its Mixtures With Sf 6 And Its Mixtures On Insulation Propertymentioning

confidence: 99%

The Performance of Insulation and Arc Interruption of the Environmentally Friendly Gas CF3I

Xiao¹

2018

New Trends in High Voltage Engineering

View full text Add to dashboard Cite

Many researches of trifluoroiodomethane (CF 3 I) have shown that CF 3 I has many excellent properties that make it one of the possible alternatives of SF 6 . This paper reveals the effect laws of CF 3 I gas content, gap distance, gas pressure, polarity, and electric field nonuniform coefficient on the insulation performance of CF 3 I gas mixtures. In general, CF 3 I-N 2 gas mixtures present a superior dielectric strength than CF 3 I-CO 2 under different electric field sets. The experimental results indicate that 20 and 30% content CF 3 I-N 2 gas mixtures can achieve nearly 50 and 55% insulation strength of pure SF6. In addition, to evaluate the arc interruption performance of environmentally friendly gas CF 3 I, we set up a CF 3 I transient nozzle arc model to study its thermodynamic and transport property. The analysis shows that CF 3 I gas has a good arc interruption capability, which mainly functions thermodynamic and transport properties approach that of SF 6 , and some are even better than SF 6 . The decomposition process is also aggravated by impurities including metal and water. The main by-products are greenhouse gases with GWP below that of SF 6 and are lowly toxic and incombustible.

show abstract

“…The composition was evaluated for pressures of 0.1 and 0.5 MPa. The compositions at 0.1 MPa have been published in the literature [36,37]. The calculation procedure is given below.…”

Section: Electrical and Thermal Conductivities Of High-temperature Co...mentioning

confidence: 99%

“…Thereby, we have carried out this study in three stages. The objective of the first stage of this research project was to show the particle composition of the hightemperature CO 2 -CF 3 I mixture up to 30 000 K for different CF 3 I concentrations, on the assumption of establishment of thermal equilibrium [36,37]. The second phase of this research project was aimed at finding out the thermodynamic properties of the high-temperature CO 2 -CF 3 I mixture up to 30 000 K for various CF 3 I concentrations [38].…”

Section: Introductionmentioning

confidence: 99%

Electrical and thermal conductivities of high-temperature CO₂–CF₃I mixture and transient conductance of residual arc during its extinction process

Yokomizu¹,

Ochiai²,

Matsumura³

2009

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Fundamental properties of CO2 mixed with CF3I were investigated in terms of (i) electrical and thermal conductivities at temperatures up to 30 000 K, (ii) a decay process of an arc conductance around a current zero under a free transient-recovery-voltage condition and (iii) an arc extinguishing capability in a thermal re-ignition region. The electrical conductivity at temperatures below 10 000 K proved to increase gradually with the admixture amount of CF3I. The thermal conductivity, in particular around 7000 K, was found to have marked dependence on the CF3I concentration. The result for the decay process of the residual-arc conductance under the free transient-recovery-voltage situation showed that the arc conductance attenuated more rapidly for CO2 mixed with CF3I at concentrations above 0.9 than for pure CO2. The mixture gas having the same concentrations was also revealed to cause the arc to be extinguished under a higher transient-recovery voltage than pure CO2.

show abstract

Particle Composition of CO2-CF3I Mixture at Temperatures of 300-30,000 K

Cited by 4 publications

References 10 publications

Particle composition and heat capacity of high‐temperature SF₆ present at constant volume: Discussion on formula expressing relationship between constant‐pressure and constant‐volume heat capacities

Particle composition and heat capacity of high‐temperature SF₆ present at constant volume: Discussion on formula expressing relationship between constant‐pressure and constant‐volume heat capacities

The Performance of Insulation and Arc Interruption of the Environmentally Friendly Gas CF3I

Electrical and thermal conductivities of high-temperature CO₂–CF₃I mixture and transient conductance of residual arc during its extinction process

Contact Info

Product

Resources

About

Particle Composition of CO2-CF3I Mixture at Temperatures of 300-30,000 K

Cited by 4 publications

References 10 publications

Particle composition and heat capacity of high‐temperature SF6 present at constant volume: Discussion on formula expressing relationship between constant‐pressure and constant‐volume heat capacities

Particle composition and heat capacity of high‐temperature SF6 present at constant volume: Discussion on formula expressing relationship between constant‐pressure and constant‐volume heat capacities

The Performance of Insulation and Arc Interruption of the Environmentally Friendly Gas CF3I

Electrical and thermal conductivities of high-temperature CO2–CF3I mixture and transient conductance of residual arc during its extinction process

Contact Info

Product

Resources

About

Particle composition and heat capacity of high‐temperature SF₆ present at constant volume: Discussion on formula expressing relationship between constant‐pressure and constant‐volume heat capacities

Particle composition and heat capacity of high‐temperature SF₆ present at constant volume: Discussion on formula expressing relationship between constant‐pressure and constant‐volume heat capacities

Electrical and thermal conductivities of high-temperature CO₂–CF₃I mixture and transient conductance of residual arc during its extinction process