scholarly journals The INNpinJeR: A new wall-free reactor for studying gas-phase reactions

2022 ◽  
Author(s):  
Wiebke Scholz ◽  
Bernhard Mentler ◽  
Lukas Fischer ◽  
Torsten Berndt ◽  
Armin Hansel
Keyword(s):  
Gas Phase ◽  
Flow System ◽  
Jet Flow ◽  
Impinging Jets ◽  
Oxidation Products ◽  
Gas Phase Reactions ◽  
Free Jet ◽  
Free Jet Flow

Here we characterize the new Innsbruck wall free impinging jets reactor (INNpinJeR) and compare its performance with the TROPOS free jet flow system by quantifying oxidation products of the well-understood...

A free jet flow reactor for ion/molecule reaction studies at very low energies

1990 ◽  
Vol 97 (1) ◽  
pp. 55-86 ◽  
Author(s):  
M. Hawley ◽  
T.L. Mazely ◽  
L.K. Randeniya ◽  
R.S. Smith ◽  
X.K. Zeng ◽  
...  
Keyword(s):  
Flow Reactor ◽  
Jet Flow ◽  
Free Jet ◽  
Molecule Reaction ◽  
Low Energies ◽  
Free Jet Flow

Gasphasen-Reaktionen, 58 [1, 2] β-Chlorethylazid: HCl-Eliminierung und Pyrolyse / Gas Phase Reactions, 58 [1, 2] β-Chloroethyl Azide: HCl Elimination and Pyrolysis

1987 ◽  
Vol 42 (3) ◽  
pp. 301-307 ◽  
Author(s):  
Hans Bock ◽  
Ralph Dammel
Keyword(s):  
Real Time ◽  
Gas Phase ◽  
Flow System ◽  
Chemical Activation ◽  
Thermolysis Product ◽  
Low Pressure ◽  
Gas Analysis ◽  
Gas Phase Reactions ◽  
Pressure Flow ◽  
By Products

The HCl elimination from β-chloroethyl azide (1-azido-2-chloroethane) over potassium tert. butanolate at 350 K in a low pressure flow system is optimized using PE spectroscopic real-time gas analysis. The highly explosive vinyl azide formed can be purified by cool-trapping the by-products. Its subsequent and virtually hazard-free pyrolysis yields 2H-azirine, which can be isolated at temperatures below 240 K.In contrast, the direct pyrolysis of β-chloroethyl azide requires temperatures above 710 K and results in a simultaneous split-off of both HCl and N2, yielding acetonitrile as the main thermolysis product. No intermediates such as β-chloroethanimine or ketenimine are observed, a result which is interpreted in terms of chemical activation

Gas-Phase Reactions of Isoprene and Its Major Oxidation Products

2018 ◽  
Vol 118 (7) ◽  
pp. 3337-3390 ◽  
Author(s):  
Paul O. Wennberg ◽  
Kelvin H. Bates ◽  
John D. Crounse ◽  
Leah G. Dodson ◽  
Renee C. McVay ◽  
...  
Keyword(s):  
Gas Phase ◽  
Oxidation Products ◽  
Gas Phase Reactions ◽  
Major Oxidation

1012 FLOW CHARACTERISTICS OF SUBMERGED FREE JET FLOW FROM PETAL-SHAPED NOZZLE

2013 ◽  
Vol 2013.4 (0) ◽  
pp. _1012-1_-_1012-6_
Author(s):  
SHAKOUCHI Toshihiko ◽  
IRIYAMA Shota ◽  
KAWASHIMA Yuki ◽  
TSUJIMOTO Koichi ◽  
ANDO Toshitake
Keyword(s):  
Flow Characteristics ◽  
Jet Flow ◽  
Free Jet ◽  
Shaped Nozzle ◽  
Free Jet Flow

A numerical study of the nozzle/diffuser micropump

2008 ◽  
Vol 222 (3) ◽  
pp. 525-533 ◽  
Author(s):  
K-S Yang ◽  
I-Y Chen ◽  
K-H Chien ◽  
C-C Wang
Keyword(s):  
Numerical Study ◽  
Geometric Dimension ◽  
Jet Flow ◽  
Opening Angle ◽  
Cross Sectional ◽  
Free Jet ◽  
Chamber Length ◽  
Two Factors ◽  
Versus Amplitude ◽  
Free Jet Flow

This study numerically investigates the performance of micronozzle/diffuser pump subject to the influence of frequency, opening angle, geometric dimension, and amplitude. For the effect of geometric dimension, the effect of chamber length is far more important than that of chamber depth because it can provide much more effective pumping volume. It is found that the net flowrate of a micropump increased with pumping frequency and opening angle. However, a level-off phenomenon of the net flowrate versus amplitude is seen at amplitudes nearby 150–200 μm and at an opening angle above 10°. This phenomenon is associated with two factors that compensate with each other. One is the free jet flow from the outlet that overturns and blocks the flow from the inlet. The other is the reduction of the strength of jet flow at a larger amplitude owing to effective increase of cross-sectional area.

Si+ and SiO+ reactions of atmospheric importance

1969 ◽  
Vol 47 (10) ◽  
pp. 1808-1809 ◽  
Author(s):  
F. C. Fehsenfeld
Keyword(s):  
Gas Phase ◽  
Rate Constants ◽  
Flow System ◽  
Gas Phase Reactions ◽  
Approximate Rate

Flow system measurements are reported of the approximate rate constants for the gas phase reactions Si+ + O2 → SiO+ + O, SiO+ + N → Si+ + NO or NO+ + Si, and SiO+ + O → Si+ + O2. The constants are, respectively, <10−11, ∼1.5 × 10−10, ∼1.5 × 10−10, and 2 × 10−10, all in cm3 s−1.

Free Jet Flow Modulation

1975 ◽  
Vol 8 (1) ◽  
pp. 482-486
Author(s):  
J.D. Malcolm
Keyword(s):  
Jet Flow ◽  
Flow Modulation ◽  
Free Jet ◽  
Free Jet Flow

Analysis of the Vortex Dynamics and Instability Mechanisms for a Lobed Nozzle Jet

2020 ◽  
Author(s):  
Aarthi Sekaran ◽  
Noushin Amini
Keyword(s):  
Vortex Dynamics ◽  
Large Scale ◽  
Three Dimensional ◽  
Jet Flow ◽  
Passive Flow Control ◽  
Free Jet ◽  
Passive Flow ◽  
Instability Modes ◽  
Free Jet Flow ◽  
Lobed Nozzle

Abstract The application of radially lobed nozzles has seen renewed challenges in the recent past with their roles in combustion chambers and passive flow control. The free jet flow from such nozzles has been studied for different flow conditions and compared to jets from round nozzles, verifying their improved mixing abilities. The precise mixing mechanisms of these nozzles are, however, not entirely understood and yet to be analyzed for typical jet parameters and excitation modes. While past studies have proposed the presence of spanwise Kelvin-Helmholtz instability modes, the roll-up frequencies of the structures indicate more than one primary structure, which is challenging to resolve experimentally. The present study carries out three dimensional CFD simulations of the flow from a tubular lobed nozzle to identify instability mechanisms and vortex dynamics that lead to enhanced mixing. We initially validate the model against existing hotwire and LDV data following which a range of Large Eddy Simulations (LES) are carried out. The free jet flow was at a Reynolds number of around 5 × 104, based on the effective jet diameter. Initial results are compared to that of a round nozzle to demonstrate changes in mixing mechanisms. The lobed nozzle simulations confirmed the presence of K-H-like modes and their evolution. We also track the formation and the transport of coherent structures from the tubular part of the nozzle to the core flow, to reveal the evolution of the large-scale streamwise modes at the crests and corresponding horseshoe-like structures at the troughs.

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