scholarly journals High Pressure Helium Gas Technique for Low Temperature Applications

2007 ◽  
Vol 76 (Suppl.A) ◽  
pp. 212-215 ◽  
Author(s):  
Sergei M. Stishov ◽  
Alla E. Petrova
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
Helium Gas ◽  
Temperature Applications

scholarly journals Thermoelastohydrodynamic Characteristics of Low-Temperature Helium Gas T-Groove Face Seals

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2873
Author(s):  
Delei Zhu ◽  
Jing Yang ◽  
Shaoxian Bai
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
Rate Increase ◽  
Leakage Rate ◽  
Monotonic Trend ◽  
Rotating Speed ◽  
Sealing Performance ◽  
Helium Gas ◽  
Face Seals ◽  
Compressibility Coefficient

Thermoelastohydrodynamic lubrication behaviors of helium gas T-groove face seals are numerically simulated under conditions of low temperature and high pressure, with the consideration of real-gas properties including compressibility coefficient, viscosity, and heat capacity. It is found that helium gas T-groove face seal presents a sharp divergent deformation at low temperature and high pressure, which makes the opening performance weaken and the leakage rate increase. This result is obviously different from the case of high-temperature gas face seals. As the sealing temperature drops from 300 K to 150 K, the leakage rate increases about 17% and the opening force decreases about 15%. Moreover, with the growth of rotational speed, both the outlet film pressure and the sealing performance present a non-monotonic trend. Specifically, while the rotating speed of moving ring raises from 3000 to 30,000 r·min−1, the leakage rate changes more than 30%, and the opening force is reduced about 10%.

scholarly journals Conventional and Electromagnetic-induction Sintering of High Entropy Alloys for Low-temperature Applications

2020 ◽  
Vol 26 (S2) ◽  
pp. 2916-2917
Author(s):  
Luis Laguna Zubia ◽  
C.G. Garay-Reyes ◽  
M.A. Ruiz-Esparza-Rodriguez ◽  
J.M. Mendoza-Duarte ◽  
Ivanovich Estrada ◽  
...  
Keyword(s):  
Low Temperature ◽  
Electromagnetic Induction ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Temperature Applications

Low-Temperature Hydrogenation of Mg-Ni-Nb2O5 Alloy Processed by High-Pressure Torsion

2021 ◽  
pp. 160309
Author(s):  
M. Osorio-García ◽  
K. Suárez-Alcántara ◽  
Y. Todaka ◽  
A. Tejeda-Ochoa ◽  
M. Herrera Ramírez ◽  
...  
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
High Pressure Torsion

Study of high-pressure air jet controlled compression ignition with compound thermodynamic cycle for combustion and emission formation process

2020 ◽  
pp. 146808742096933
Author(s):  
Xiangyu Meng ◽  
Sicheng Liu ◽  
Jingchen Cui ◽  
Jiangping Tian ◽  
Wuqiang Long ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Low Temperature ◽  
Formation Process ◽  
Combustion Process ◽  
Thermodynamic Cycle ◽  
Compression Ignition ◽  
Temperature Reaction ◽  
Air Jet ◽  
High Temperature Reaction

A novel method called high-pressure air (HPA) jet controlled compression ignition (JCCI) based on the compound thermodynamic cycle was investigated in this work. The combustion process of premixed mixture can be controlled flexibly by the high-pressure air jet compression, and it characterizes the intensified low-temperature reaction and two-stage high-temperature reaction. The three-dimensional (3D) computational fluid dynamics (CFD) numerical simulation was employed to study the emission formation process and mechanism, and the effects of high-pressure air jet temperature and duration on emissions were also investigated. The simulation results showed that the NOx formation is mainly affected by the first-stage high-temperature reaction due to the higher reaction temperature. Overall, this combustion mode can obtain ultra-low NOx emission. The second-stage high-temperature reaction plays an important role in the CO and THC formation caused by the mixing effect of the high-pressure air and original in-cylinder mixture. The increasing air jet temperature leads to a larger high-temperature in-cylinder region and more fuel in the first-stage reaction, and therefore resulting in higher NOx emission. However, the increasing air jet temperature can significantly reduce the CO and THC emissions. For the air jet duration comparisons, both too short and too long air jet durations could induce higher NOx emission. A higher air jet duration would result in higher CO emission due to the more high-pressure air jet with relatively low temperature.

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