scholarly journals Analytical calculation and evolutionary regression method for isentropic exponent of hydrogen gas at the throat of critical nozzle

2014 ◽  
Vol 63 (16) ◽  
pp. 164701
Author(s):  
Ding Hong-Bing ◽  
Wang Chao ◽  
Zhao Ya-Kun
Keyword(s):  
Analytical Calculation ◽  
Regression Method ◽  
Hydrogen Gas ◽  
Critical Nozzle ◽  
Isentropic Exponent

Computational Study on the Critical Nozzle Flow of High-Pressure Hydrogen Gas

2008 ◽  
Vol 24 (4) ◽  
pp. 715-721 ◽  
Author(s):  
Jae-hyung Kim ◽  
Heuy-dong Kim ◽  
Toshiaki Setoguchi ◽  
Sigeru Matsuo
Keyword(s):  
High Pressure ◽  
Computational Study ◽  
Hydrogen Gas ◽  
Nozzle Flow ◽  
Critical Nozzle ◽  
Pressure Hydrogen

Numerical Study on Characteristics of High-Pressure Hydrogen Gas Flow in a Critical Nozzle

2019 ◽  
Vol 2019.72 (0) ◽  
pp. D15
Author(s):  
Shigeru MATSUO ◽  
Yusuke FUKUSHIMA ◽  
Kazuki NIIBAYASHI ◽  
Toshihiro MORIOKA ◽  
Naoya SAKODA ◽  
...  
Keyword(s):  
High Pressure ◽  
Gas Flow ◽  
Numerical Study ◽  
Hydrogen Gas ◽  
Critical Nozzle ◽  
Pressure Hydrogen

A computational study of real gas flows through a critical nozzle

2008 ◽  
Vol 223 (3) ◽  
pp. 617-626 ◽  
Author(s):  
J-H Kim ◽  
H-D Kim ◽  
T Setoguchi ◽  
S Matsuo
Keyword(s):  
Reynolds Number ◽  
High Pressure ◽  
Discharge Coefficient ◽  
Stokes Equations ◽  
Hydrogen Gas ◽  
Molecular Volume ◽  
Real Gas ◽  
The Real ◽  
Critical Nozzle ◽  
Real Gas Effects

A critical nozzle is used to measure the mass flowrate of gas. It is well known that the coefficient of discharge of the flow in a critical nozzle is a single function of the Reynolds number, in which the discharge coefficient approaches unity as the Reynolds number increases. However, it has recently been reported that at very high Reynolds numbers, which correspond to high-pressure supply conditions, the discharge coefficient exceeds unity. This impractical value in the discharge coefficient is vaguely inferred to be due to real gas effects. The purpose of the present study is to investigate high-pressure hydrogen gas flow through a critical nozzle. A computational analysis has been carried out to simulate a critical nozzle flow with real gas effects. Redlich—Kwong's equation of state is incorporated into the axisymmetric, compressible Navier—Stokes equations to account for the inter-molecular forces and molecular volume of hydrogen. The computational results show that the critical pressure ratio and the discharge coefficient for ideal gas assumptions are significantly different from those of the real gas, as the Reynolds number exceeds a certain value. It is also known that the real gas effects appear largely in terms of the compressibility factor and the specific heat ratio, and these become more remarkable as the pressure of hydrogen increases.

scholarly journals 813 Characteristics of High-Pressure Hydrogen Gas Flow in a Critical Nozzle

2013 ◽  
Vol 2013.66 (0) ◽  
pp. 259-260
Author(s):  
Junji NAGAO ◽  
Shigeru MATUO ◽  
Shotaro SUETSUGU ◽  
Toshiaki SETOGUCHI ◽  
Masanori MONDE
Keyword(s):  
High Pressure ◽  
Gas Flow ◽  
Hydrogen Gas ◽  
Critical Nozzle ◽  
Pressure Hydrogen

scholarly journals Numerical Study on the Effect of Unsteady Downstream Conditions on Hydrogen Gas Flow through a Critical Nozzle

2012 ◽  
Vol 02 (04) ◽  
pp. 137-144
Author(s):  
Junji Nagao ◽  
Shigeru Matsuo ◽  
Toshiaki Setoguchi ◽  
Heuy Dong Kim
Keyword(s):  
Gas Flow ◽  
Numerical Study ◽  
Hydrogen Gas ◽  
Critical Nozzle ◽  
Flow Through

Flow characteristics of hydrogen gas through a critical nozzle

2014 ◽  
Vol 39 (8) ◽  
pp. 3947-3955 ◽  
Author(s):  
Hongbing Ding ◽  
Chao Wang ◽  
Yakun Zhao
Keyword(s):  
Flow Characteristics ◽  
Hydrogen Gas ◽  
Critical Nozzle

A study of the critical nozzle for flow rate measurement of high-pressure hydrogen gas

2007 ◽  
Vol 16 (1) ◽  
pp. 28-32 ◽  
Author(s):  
H. D. Kim ◽  
J. H. Lee ◽  
K. A. Park ◽  
T. Setoguchi ◽  
S. Matsuo
Keyword(s):  
High Pressure ◽  
Flow Rate ◽  
Hydrogen Gas ◽  
Rate Measurement ◽  
Flow Rate Measurement ◽  
Critical Nozzle ◽  
Pressure Hydrogen

Motions of neutral hydrogen at high latitudes

1967 ◽  
Vol 31 ◽  
pp. 265-278 ◽  
Author(s):  
A. Blaauw ◽  
I. Fejes ◽  
C. R. Tolbert ◽  
A. N. M. Hulsbosch ◽  
E. Raimond
Keyword(s):  
Surface Density ◽  
Velocity Dispersion ◽  
Neutral Hydrogen ◽  
Hydrogen Gas ◽  
High Latitudes ◽  
Low Velocity

Earlier investigations have shown that there is a preponderance of negative velocities in the hydrogen gas at high latitudes, and that in certain areas very little low-velocity gas occurs. In the region 100° <l< 250°, + 40° <b< + 85°, there appears to be a disturbance, with velocities between - 30 and - 80 km/sec. This ‘streaming’ involves about 3000 (r/100)2solar masses (rin pc). In the same region there is a low surface density at low velocities (|V| < 30 km/sec). About 40% of the gas in the disturbance is in the form of separate concentrations superimposed on a relatively smooth background. The number of these concentrations as a function of velocity remains constant from - 30 to - 60 km/sec but drops rapidly at higher negative velocities. The velocity dispersion in the concentrations varies little about 6·2 km/sec. Concentrations at positive velocities are much less abundant.

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