scholarly journals Simulation of gas-dynamic, pressure surges and adiabatic compression phenomena in geometrically complex respirator oxygen valves

2021 ◽  
pp. 100906
Author(s):  
Anas Obeidat ◽  
Thomas Andreas ◽  
Stéphane P. A. Bordas ◽  
Andreas Zilian
Keyword(s):  
Dynamic Pressure ◽  
Adiabatic Compression ◽  
Gas Dynamic ◽  
Geometrically Complex

Calculation of plasma centrifugal spraying parameters of fine granules of heat-resistant nickel alloys

2020 ◽  
pp. 471-474
Author(s):  
M.G. Yagodin ◽  
E.I. Starovoytenko
Keyword(s):  
Powder Metallurgy ◽  
Nickel Alloys ◽  
Dynamic Pressure ◽  
Calculated Data ◽  
Powder Size ◽  
Metal Powders ◽  
Heat Resistant ◽  
Gas Dynamic ◽  
Spraying Parameters ◽  
Wide Range

The equipment for the production of wide range of metal powders purposed for powder metallurgy is described. The possibility for producing of powders by the plasma centrifugal spraying is considered taking into account the gas dynamic pressure. The calculated data on the powder size for different materials are given.

Gas‐dynamic pressure‐wave machine with reduced noise amplitude

1991 ◽  
Vol 90 (5) ◽  
pp. 2877-2878 ◽  
Author(s):  
Andreas Mayer
Keyword(s):  
Pressure Wave ◽  
Dynamic Pressure ◽  
Noise Amplitude ◽  
Gas Dynamic

scholarly journals Research in a physical model with the top blowing of a gas-dynamic head and jet parameters at blowing of a liquid bath through an annular coaxial slit nozzle

2018 ◽  
Author(s):  
S.I. Semykin ◽  
T.S. Golub ◽  
S.A. Dudchenko ◽  
V.V. Vakulchuk
Keyword(s):  
Physical Model ◽  
Dynamic Pressure ◽  
Liquid Bath ◽  
Gas Jet ◽  
Oxygen Absorption ◽  
Equivalent Diameter ◽  
Depth Of Penetration ◽  
Gas Dynamic ◽  
Dynamic Head ◽  
Purge Gas

The aim of the work is to study the physical model of the gas-dynamic head of a gas jet and the parameters of its penetration into the liquid bath of the converter when it flows out of the annular slotted tuyere. The studies were carried out on a «cold» stand on a scale of 1:30 to a 160-m converter (taking into account the criteria of geometrical and physical similarity) using water as a liquid simulating a molten metal,. The averaged values of the depth of penetration of the gas stream of the jet at various blowing parameters were estimated. It is noted that when the upper purge through a coaxial slit nozzle with an increase in the pressure of the purge gas, the dynamic pressure of the depth of penetration of the jet increases. The increase in dynamic pressure and the depth of the introduction of a gas jet leads to an increase in the degree of impact on the bath and an increase in the degree of oxygen absorption by the melt. It was shown that, all other things being equal, the operation of a coaxial slit differs by a large impulse of exposure to a liquid than when blowing through an equivalent diameter slot through one centrally located nozzle, especially at pressures above 0.15-0.3 MPa. The possibilities of increasing the efficiency of the top blowing of the converter bath are shown through the use of a slotted coaxial nozzle.

ANALYSIS OF METHODS AND PRESENTATION OF RESULTS OF EXPERIMENTAL RESEARCH OF LOW FREQUENCY GAS DYNAMIC PULSATIONS IN PIPELINES OF POWER PLANTS

Akustika ◽  
2021 ◽  
pp. 200-204
Author(s):  
Andrey Vasilyev
Keyword(s):  
Experimental Research ◽  
Power Plants ◽  
Sound Pressure ◽  
Dynamic Pressure ◽  
Low Frequency ◽  
Pressure Level ◽  
Gas Pressure ◽  
Pressure Pulsations ◽  
Gas Dynamic ◽  
Experimental Researches

The results of analysis of Russian approaches and of experience of development of methods and of results of experimental research of low-frequency gas dynamic pressure pulsations in pipelines of power plants are described. Peculiarities of Russian standards and of the sanitary norms are considered. According to results of experimental researches is possible to conclude that the maximal vibration levels are observed on the frequencies 31,5 Hz and 40 Hz. The same results were obtained during the measurements of sound pressure level on the same experimental compressor mount. Earlier during the experiments on the same mount it was achieved that the maximal values of low frequency gas pressure pulsations are observed on the frequency 35 Hz. Thus, it was experimentally shown that gas pressure pulsations are making the main contribution into forming of low frequency sound and vibration of compressor mount.

scholarly journals Magnetosheath waves under very low solar wind dynamic pressure: Wind/Geotail observations

2005 ◽  
Vol 23 (4) ◽  
pp. 1317-1333 ◽  
Author(s):  
C. J. Farrugia ◽  
F. T. Gratton ◽  
G. Gnavi ◽  
H. Matsui ◽  
R. B. Torbert ◽  
...  
Keyword(s):  
Solar Wind ◽  
Dynamic Pressure ◽  
Wave Activity ◽  
Bow Shock ◽  
Solar Wind Dynamic Pressure ◽  
Temperature Anisotropy ◽  
Left Hand ◽  
Gas Dynamic ◽  
Right Hand ◽  
Polarized Waves

Abstract. The expanded bow shock on and around "the day the solar wind almost disappeared" (11 May 1999) allowed the Geotail spacecraft to make a practically uninterrupted 54-h-long magnetosheath pass near dusk (16:30-21:11 magnetic local time) at a radial distance of 24 to 30 RE (Earth radii). During most of this period, interplanetary parameters varied gradually and in such a way as to give rise to two extreme magnetosheath structures, one dominated by magnetohydrodynamic (MHD) effects and the other by gas dynamic effects. We focus attention on unusual features of electromagnetic ion wave activity in the former magnetosheath state, and compare these features with those in the latter. Magnetic fluctuations in the gas dynamic magnetosheath were dominated by compressional mirror mode waves, and left- and right-hand polarized electromagnetic ion cyclotron (EIC) waves transverse to the background field. In contrast, the MHD magnetosheath, lasting for over one day, was devoid of mirror oscillations and permeated instead by EIC waves of weak intensity. The weak wave intensity is related to the prevailing low solar wind dynamic pressures. Left-hand polarized EIC waves were replaced by bursts of right-hand polarized waves, which remained for many hours the only ion wave activity present. This activity occurred when the magnetosheath proton temperature anisotropy (= ) became negative. This was because the weakened bow shock exposed the magnetosheath directly to the (negative) temperature anisotropy of the solar wind. Unlike the normal case studied in the literature, these right-hand waves were not by-products of left-hand polarized waves but derived their energy source directly from the magnetosheath temperature anisotropy. Brief entries into the low latitude boundary layer (LLBL) and duskside magnetosphere occurred under such inflated conditions that the magnetospheric magnetic pressure was insufficient to maintain pressure balance. In these crossings, the inner edge of the LLBL was flowing sunward. The study extends our knowledge of magnetosheath ion wave properties to the very low solar wind dynamic pressure regime.

The Effects of Direction and Velocity of Movement, and Intra-Articular Fluid Volume on Intra-Articular Pressue

1988 ◽  
Vol 01 (03/04) ◽  
pp. 113-121 ◽  
Author(s):  
S. F. Straface ◽  
P. J. Newbold ◽  
S. Nade
Keyword(s):  
Dynamic Pressure ◽  
Volume Of Fluid ◽  
Joint Capsule ◽  
Fluid Volume ◽  
Structural Configuration

levels. In joints with simulated acute effusion the effect of position on IAP was dependent upon the volume of fluid in the joint. The results indicate that dynamic pressure levels in the moving knee are related to the movements of the joint. The characteristic and reproducible patterns of pressure may reflect changes in the structural configuration of the joint capsule and surrounding tissues during movement, and are influenced by the amount of fluid in the joint.

DYNAMIC PRESSURE

2006 ◽  
Vol d ◽  
Author(s):  
C. Swan
Keyword(s):  
Dynamic Pressure
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