Experimental investigation and modeling of the kinetics of CCl4 pyrolysis behind reflected shock waves using high-repetition-rate time-of-flight mass spectrometry

2013 ◽  
Vol 15 (8) ◽  
pp. 2821 ◽  
Author(s):  
M. Aghsaee ◽  
A. Drakon ◽  
A. Eremin ◽  
S. H. Dürrstein ◽  
H. Böhm ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Experimental Investigation ◽  
Shock Waves ◽  
Repetition Rate ◽  
Time Of Flight ◽  
High Repetition Rate ◽  
High Repetition ◽  
Reflected Shock ◽  
Flight Mass Spectrometry ◽  
Kinetics Of

Shock-tube study of the decomposition of tetramethylsilane using gas chromatography and high-repetition-rate time-of-flight mass spectrometry

2018 ◽  
Vol 20 (16) ◽  
pp. 10686-10696 ◽  
Author(s):  
P. Sela ◽  
S. Peukert ◽  
J. Herzler ◽  
M. Fikri ◽  
C. Schulz
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Shock Tube ◽  
Repetition Rate ◽  
High Repetition Rate ◽  
High Repetition ◽  
Reflected Shock ◽  
Flight Mass Spectrometry ◽  
Tof Ms ◽  
Tube Study

The decomposition of tetramethylsilane was studied in shock-tube experiments in a temperature range of 1270–1580 K and pressures ranging from 1.5 to 2.3 bar behind reflected shock waves combining GC/MS and HRR-TOF-MS.

Shock-tube study of the decomposition of octamethylcyclotetrasiloxane and hexamethylcyclotrisiloxane

2020 ◽  
Vol 234 (7-9) ◽  
pp. 1395-1426 ◽  
Author(s):  
Paul Sela ◽  
Sebastian Peukert ◽  
Jürgen Herzler ◽  
Christof Schulz ◽  
Mustapha Fikri
Keyword(s):  
Mass Spectrometry ◽  
Shock Tube ◽  
High Repetition Rate ◽  
Rate Coefficients ◽  
Gas Chromatography Mass Spectrometry ◽  
High Concentration ◽  
Gas Phase Chemistry ◽  
Reflected Shock ◽  
Flight Mass Spectrometry ◽  
Phase Chemistry

AbstractShock-tube experiments have been performed to investigate the thermal decomposition of octamethylcyclotetrasiloxane (D4, Si4O4C8H24) and hexamethylcyclotrisiloxane (D3, Si3O3C6H18) behind reflected shock waves by gas chromatography/mass spectrometry (GC/MS) and high-repetition-rate time-of-flight mass spectrometry (HRR-TOF-MS) in a temperature range of 1160–1600 K and a pressure range of 1.3–2.6 bar. The main observed stable products were methane (CH4), ethylene (C2H4), ethane (C2H6), acetylene (C2H2) and in the case of D4 pyrolysis, also D3 was measured as a product in high concentration. A kinetics sub-mechanism accounting for the D4 and D3 gas-phase chemistry was devised, which consists of 19 reactions and 15 Si-containing species. The D4/D3 submechanism was combined with the AramcoMech 2.0 (Li et al., Proc. Combust. Inst. 2017, 36, 403–411) to describe hydrocarbon chemistry. The unimolecular rate coefficients for D4 and D3 decomposition are represented by the Arrhenius expressions ktotal/D4(T) = 2.87 × 1013 exp(−273.2 kJ mol−1/RT) s−1 and ktotal/D3(T) = 9.19 × 1014 exp(−332.0 kJ mol−1/RT) s−1, respectively.

scholarly journals A high repetition rate time-of-flight electron energy analyzer

2007 ◽  
Vol 91 (17) ◽  
pp. 173506 ◽  
Author(s):  
S. A. Hilbert ◽  
B. Barwick ◽  
M. Fabrikant ◽  
C. J. G. J. Uiterwaal ◽  
H. Batelaan
Keyword(s):  
Electron Energy ◽  
Repetition Rate ◽  
Time Of Flight ◽  
High Repetition Rate ◽  
Energy Analyzer ◽  
High Repetition

Study of Effect of Repetition Rate on Laser Shock Peening Using Finite Element Modeling

2020 ◽  
Author(s):  
Sai Kosaraju ◽  
Xin Zhao
Keyword(s):  
Shock Wave ◽  
Residual Stress ◽  
Finite Element ◽  
Shock Waves ◽  
Repetition Rate ◽  
High Repetition Rate ◽  
Stress Profile ◽  
Surface Residual Stress ◽  
Residual Stress Profile ◽  
High Repetition

Abstract A two-dimensional finite element model is developed to simulate the interaction between metal samples and laser-induced shock waves. Multiple laser impacts are applied at each location to increase plastically affected depth and compressive stress. The in-depth and surface residual stress profiles are analyzed at various repetition rates and spot sizes. It is found that the residual stress is not sensitive to repetition rate until it reaches a very high level. At extremely high repetition rate (100 MHz), the delay between two shock waves is even shorter than their duration, and there will be shock wave superposition. It is revealed that the interaction of metal with shock wave is significantly different, leading to a different residual stress profile. Stronger residual stress with deeper distribution will be obtained comparing with lower repetition rate cases. The effect of repetition rate at different spot sizes is also studied. It is found that with larger laser spot, the peak compressive residual stress decreases but the distribution is deeper at extremely high repetition rates.

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