scholarly journals Spatio-temporal ion temperature and velocity measurements in a Z pinch using fast-framing spectroscopy

2020 ◽  
Vol 91 (8) ◽  
pp. 083104
Author(s):  
E. G. Forbes ◽  
U. Shumlak
Keyword(s):  
Ion Temperature ◽  
Velocity Measurements ◽  
Spatio Temporal ◽  
Z Pinch

High Spatio-Temporal Resolution Digital Particle Image Velocimetry Near Compliant, Dynamically Moving Boundaries

2002 ◽  
Author(s):  
Ali Etebari ◽  
Claude Abiven ◽  
Olga Pierrakos ◽  
Pavlos P. Vlachos
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
State Of The Art ◽  
Digital Particle Image Velocimetry ◽  
Moving Boundaries ◽  
Global Flow ◽  
Velocity Measurements ◽  
Non Invasive ◽  
Image Velocimetry ◽  
Spatio Temporal

Digital Particle Image Velocimetry (DPIV) currently represents the state of the art for non-invasive global flow velocity measurements. The instantaneous velocities are determined by cross-correlating patterns of particles between consecutive images, thus mapping in space and time the velocity distribution for thousands of points in the flow field simultaneously.

scholarly journals Imaging Aluminum Particles in Solid-Propellant Flames Using 5 kHz LIF of Al Atoms

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2421 ◽  
Author(s):  
Gautier Vilmart ◽  
Nelly Dorval ◽  
Robin Devillers ◽  
Yves Fabignon ◽  
Brigitte Attal-Trétout ◽  
...  
Keyword(s):  
Solid Propellant ◽  
Sampling Rate ◽  
Wide Field ◽  
Velocity Measurements ◽  
Aluminum Particles ◽  
Propellant Combustion ◽  
Spatio Temporal ◽  
Distribution Behavior ◽  
Propellant Surface ◽  
Good Agreement

Laser-induced fluorescence imaging of aluminum atoms (Al-PLIF) is used to analyze the spatio-temporal behavior of aluminized solid propellant combustion. Using alternating LIF and chemiluminescence emission images of the particles in the gaseous and liquid phase evolving close to and far above the dynamically varying propellant surface, sequences of images were recorded and analyzed. The good sensitivity achieved enabled us to track the dynamics of the flame in the vicinity of particles detected all along the flame extension and up to 1.5 MPa. Analysis of wide-field images enabled droplet velocity measurements due to the high LIF sampling rate (5 kHz). The observed typical plume structures were in good agreement with alumina-formation prediction and previous shadowgraphy visualization. High-resolution sequences of images showed gaseous distribution behavior around the molten particles. The Al vapor phase was thus found to extend between 3 and 6.5 radii around the particles. Particle detachment dynamics were captured just above the propellant surface.

Measurement in the Wake Region of Two Bubbles in Close Proximity by Combined Shadow-Image and PIV Techniques

1999 ◽  
Vol 121 (1) ◽  
pp. 191-197 ◽  
Author(s):  
A. Tokuhiro ◽  
A. Fujiwara ◽  
K. Hishida ◽  
M. Maeda
Keyword(s):  
Ccd Camera ◽  
Shadow Image ◽  
Wake Flow ◽  
Air Bubbles ◽  
Velocity Measurements ◽  
Square Channel ◽  
Image Velocimetry ◽  
Close Proximity ◽  
Spatio Temporal ◽  
Two Bubbles

An experimental study on flow around two similarly-sized, adjacent air bubbles confined in a 1000 mm vertical, square channel (100 × 100 mm2) with downward flow of water was conducted. The bubbles were D = 11.7 mm in major diameter, ellipsoidal in shape (0.4 ml volume) and 12 mm apart. The Reynolds and Eo¨tvo¨s numbers were 1950 < ReD < 2250, 11 < Eo < 11.5 such that the bubbles oscillated. Velocity measurements were taken using Digital Particle Image Velocimetry, Complemented by Laser Induced Fluorescence. Simultaneously, a second CCD camera recorded the shadow image of the bubble pair’s motions. Visualization revealed that the bubbles move out of phase and do not collide nor coalesce. The velocity data revealed the dynamic interaction of two wake-flow velocity fields with a jet-like flow in-between. From the DPIV data, estimates of the vorticity, Reynolds-stress and turbulent kinetic energy (TKE) distributions confirmed the spatio-temporal nature of the flow. Details will be presented.

Measuring of spatio-temporal characteristics Z-pinch from deuterated polyethylene

2009 ◽  
Vol 54 (2) ◽  
pp. 499-502 ◽  
Author(s):  
A. A. Akunets ◽  
S. S. Anan’ev ◽  
Yu. L. Bakshaev ◽  
P. I. Blinov ◽  
V. A. Bryzgunov ◽  
...  
Keyword(s):  
Temporal Characteristics ◽  
Spatio Temporal ◽  
Deuterated Polyethylene ◽  
Z Pinch

scholarly journals A spectrometer for high-precision ion temperature and velocity measurements in low-temperature plasmas

2019 ◽  
Vol 90 (6) ◽  
pp. 063502 ◽  
Author(s):  
J. Milhone ◽  
K. Flanagan ◽  
M. D. Nornberg ◽  
M. Tabbutt ◽  
C. B. Forest
Keyword(s):  
Low Temperature ◽  
High Precision ◽  
Ion Temperature ◽  
Velocity Measurements ◽  
Low Temperature Plasmas

Ion temperature and plasma rotation velocity measurements using visible spectroscopy on TdeV

1999 ◽  
Vol 70 (1) ◽  
pp. 387-390 ◽  
Author(s):  
I. Condrea ◽  
E. Haddad ◽  
B. C. Gregory ◽  
D. Lafrance ◽  
J. L. Lachambre ◽  
...  
Keyword(s):  
Rotation Velocity ◽  
Ion Temperature ◽  
Velocity Measurements ◽  
Visible Spectroscopy ◽  
Plasma Rotation

scholarly journals Spatio-temporal variability of surface mass balance in the accumulation zone of the Mer de Glace, French Alps, from multitemporal terrestrial LiDAR measurements

2020 ◽  
pp. 1-10
Author(s):  
Marion Réveillet ◽  
Christian Vincent ◽  
Delphine Six ◽  
Antoine Rabatel ◽  
Olivier Sanchez ◽  
...  
Keyword(s):  
Mass Balance ◽  
Temporal Variability ◽  
Surface Mass Balance ◽  
Velocity Measurements ◽  
Event Scale ◽  
Surface Mass ◽  
Terrestrial Lidar ◽  
Accumulation Zone ◽  
Spatio Temporal ◽  
Elevation Model

Abstract Spatio-temporal variability of the winter surface mass balance is a major uncertainty in the modelling of annual surface mass balance. Moreover, its measurement at high spatio-temporal resolution (sub-200 m) is very useful to force, calibrate or validate models. This study presents the results of year-round field campaigns to study the evolution of the surface mass balance in a ~2 km2 portion of the accumulation zone of the Mer de Glace (France). It is based on repeated LiDAR acquisitions, submergence-velocity measurements and meteorological records. The two methods used to quantify submergence velocities show good agreement. They present a linear temporal evolution without significant seasonal changes but display significant spatial variability. We conclude that a dense network of submergence velocity measurements is required to reduce the uncertainties when computing winter and annual surface mass balance from digital elevation model differencing. Finally, a hight spatio-temporal variability of the winter surface mass balance is highlighted (e.g., a std dev. of 0.92 m in April) even though the topography is homogeneous (std dev. of 25 m). Attempts to relate this variability to different morpho-topographic variables and wind-related indexes show the need for studies conducted at the snowfall event scale to obtain a better understanding of the variability in mass balance at the glacier scale.

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