scholarly journals Direct Monte Carlo Simulations of a Binary Gas Free-Jet Flow Over a Flat Plate

2011 ◽  
Author(s):  
Eric Cecil
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Flat Plate ◽  
Jet Flow ◽  
Free Jet ◽  
Free Jet Flow

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

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.

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.

S1904-1-4 Arc heating experiments of silicon carbide in carbon dioxide plasma free jet flow

2010 ◽  
Vol 2010.5 (0) ◽  
pp. 421-422
Author(s):  
Toyohiro ITO ◽  
Makoto TAKAGI ◽  
Akihito MATSUMURO ◽  
Kazutaka KITAGAWA ◽  
Michiru YASUHARA
Keyword(s):  
Carbon Dioxide ◽  
Silicon Carbide ◽  
Jet Flow ◽  
Free Jet ◽  
Arc Heating ◽  
Carbon Dioxide Plasma ◽  
Free Jet Flow

A pdf Description of Turbulent Axisymmetric Free Jet Flow

1999 ◽  
Vol 121 (1) ◽  
pp. 73-79 ◽  
Author(s):  
Ming-Hua Chen ◽  
Zuu-Chang Hong
Keyword(s):  
Moment Method ◽  
Jet Flow ◽  
Moment Closure ◽  
Turbulence Structure ◽  
Free Jet ◽  
Closure Models ◽  
The Mean ◽  
Probability Density Function Pdf ◽  
Mean Strain ◽  
Free Jet Flow

This study presents the applications of a turbulence probability density function (pdf) equation to compute an axisymmetric turbulent free jet flow. In view of the difficulty of solving this pdf equation directly by conventional numerical methods, an approximate moment method is applied. The Calculated triple velocity correlations appearing in the second-order moments equation are calculated and compared with measured values and with those estimated by moment-closure models. The results reveal that the pdf approach gives consistency in the higher-order moments and radial budget of third moments of velocity, and that the neglect of the mean-strain production, the rapid part of the pressure correlation and the dissipation are responsible for deviations between moment-closure models and experiments. Therefore, pdf methods appear to be more suitable than conventional moment-closure models in terms of revealing turbulence structure.

Sign in / Sign up

Export Citation Format

Share Document