Study of Unsteady Supersonic Jet Using Shock Tube with Small High-Pressure Chamber with Elliptical Cell

2013 ◽  
Vol 767 ◽  
pp. 80-85 ◽  
Author(s):  
Motoki Sakamoto ◽  
Masazumi Matsui ◽  
Hiroshi Fukuoka ◽  
Minoru Yaga ◽  
Toshio Takiya
Keyword(s):  
Shock Wave ◽  
High Pressure ◽  
Laser Ablation ◽  
Shock Tube ◽  
Static Pressure ◽  
Focal Point ◽  
Supersonic Jet ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
High Pressure Chamber

The unsteady supersonic jet formed by the shock tube with small high-pressure chamber was used as a simple alternative model of Pulsed laser ablation. Since the pressure of the shock wave formed by Pulsed laser ablation is very high, the interaction between the shock wave and the plume is important for the formation of nanoparticles especially under high background gas pressure. An elliptical cell is used for controlling the shock wave. The shock wave discharged in one focal point converge another focal point. Numerical calculation was carried out by solving the axisymmetric two-dimensional compressible Navier-Stokes equations. The wall static pressure monitored at the center of substrate is used to evaluate the influence of the shape and the pressure ratio on the behavior of the shock wave, the plume, and their interaction. As a result, it was found that the vortex ring was generated downstream of the cell, which is followed by the discharging shock wave from the cell exit. It was also found that the influence of the vortex ring on the wall static pressure at the center of the substrate.

Observation of Supersonic Jet Using Small Volume High-Pressure Shock Tube

2018 ◽  
Vol 910 ◽  
pp. 143-148
Author(s):  
Ryohei Takemura ◽  
Hiroshi Fukuoka ◽  
Shinichi Enoki ◽  
Shigeto Nakamura ◽  
Kazuki Hiro
Keyword(s):  
Shock Wave ◽  
High Pressure ◽  
Shock Tube ◽  
Small Volume ◽  
Supersonic Jet ◽  
Pressure Chamber ◽  
High Pressure Chamber ◽  
Schlieren Method ◽  
Background Oriented Schlieren Method ◽  
Background Oriented Schlieren

The unsteady supersonic jet and the shock wave injected by the small volume shock tube are experimentally studied in this paper. The experimental was performed by the background oriented schlieren method. The main parameters for the jet are the pressure ratio by the high pressure chamber/ a back pressure 10.9-53.0 and the length of high pressure chamber/diameter ratio 1 and 10. The velocity of the shock wave and supersonic jet were estimated by using the principle of the background oriented schlieren method. The results showed that the influence of the length of the high pressure chamber on the velocity of the jet.

INVESTIGATION OF PROCESSES IN THE HIGH-PRESSURE CHAMBER OF SHOCK TUBE

2020 ◽  
Author(s):  
N. G. Bykova ◽  
◽  
I. E. Zabelinsky ◽  
P. V. Kozlov ◽  
Yu. V. Tunik ◽  
...  
Keyword(s):  
Shock Wave ◽  
High Pressure ◽  
Shock Tube ◽  
High Energy ◽  
Pressure Chamber ◽  
High Pressure Chamber ◽  
Shock Tubes ◽  
The World

There are several installations with shock tubes in the world, in which a shock wave in air propagates at a speed close to the second cosmic one. Such velocities are achieved by supplying of high energy (~ 1 MJ) to the pushing gas in the high-pressure chamber.

505 Study of Unsteady Supersonic Jet using Shock Tube with Small High-Pressure Chamber

2008 ◽  
Vol 2008.21 (0) ◽  
pp. 213-214
Author(s):  
Hiroshi FUKUOKA ◽  
Hideki MINE ◽  
Minoru YAGA ◽  
Shoichi MATSUDA ◽  
Toshio TAKIYA
Keyword(s):  
High Pressure ◽  
Shock Tube ◽  
Supersonic Jet ◽  
Pressure Chamber ◽  
High Pressure Chamber

Energy deposition and shock wave propagation during pulsed laser ablation in fused silica cavities

2004 ◽  
Vol 37 (7) ◽  
pp. 1132-1136 ◽  
Author(s):  
Xianzhong Zeng ◽  
Xianglei Mao ◽  
Sy-Bor Wen ◽  
Ralph Greif ◽  
Richard E Russo
Keyword(s):  
Shock Wave ◽  
Wave Propagation ◽  
Laser Ablation ◽  
Energy Deposition ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Fused Silica ◽  
Shock Wave Propagation

E06 Study of Unsteady Supersonic Jet using Shock Tube with Small High-Pressure Chamber

2008 ◽  
Vol 2008 (0) ◽  
pp. 173-174
Author(s):  
Hideki MINE ◽  
Minoru YAGA ◽  
Hiroshi FUKUOKA ◽  
Shoichi MATSUDA ◽  
Toshio TAKIYA
Keyword(s):  
High Pressure ◽  
Shock Tube ◽  
Supersonic Jet ◽  
Pressure Chamber ◽  
High Pressure Chamber

Size Effect on the Transformation from Graphite to Nanodiamonds

2014 ◽  
Vol 787 ◽  
pp. 412-418 ◽  
Author(s):  
Fei Tian ◽  
Hong Yang ◽  
Yong Guang Zhao ◽  
Hong Mei Cao
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Laser Ablation ◽  
Metastable Phase ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Vapor Condensation ◽  
Research Field ◽  
Laser Vaporization ◽  
Laser Ablation In Liquid

The synthesis of nanodiamonds by pulsed-laser ablation in liquid (PLAL) is an attractive research field in developing well-dispersed fluorescent nanodiamonds for bioimaging and life science. However, nanodiamonds are quite different from their widely pursued carbon allotropes both in synthesis conditions and physical properties. It is a great challenge to synthesize metastable phase nanodiamonds that prefer high temperature and high pressure. Despite the progress in the synthesis of nanodiamond by pulsed-laser ablation of graphite target using different laser power densities under room conditions, the transformation from graphite to nanodiamonds are not yet well explained. In order to have a better understanding to the formation of metastable nanodiamonds upon PLAL, the formation of nanodiamond has been elucidated from both the aspects of thermodynamics and kinetics. Due to low laser intensity and long wavelength, synthesis of nanodiamonds is the result of high cooling velocity of high-pressure and high-temperature carbon vapor condensation formed under laser vaporization of graphite particles. When diamond nuclei grow into the right size, they cannot increase and the graphite nucleation begins to form and grow on the diamond at given conditions due to long pulse width for ms-pulsed laser. In fact, the diamond particles enwrapped several layers of graphite have obtained. Moreover, the reasons related 3~6nm diamonds prepared by this new process and having narrow size distribution are also discussed.

Pulsed laser ablation plasmas generated in CO2 under high-pressure conditions up to supercritical fluid

2012 ◽  
Vol 101 (22) ◽  
pp. 224103 ◽  
Author(s):  
Toru Kato ◽  
Sven Stauss ◽  
Satoshi Kato ◽  
Keiichiro Urabe ◽  
Motoyoshi Baba ◽  
...  
Keyword(s):  
High Pressure ◽  
Laser Ablation ◽  
Supercritical Fluid ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation

Study of Interaction between Unsteady Supersonic Jet and Vortex Rings Discharged from Elliptical Cell

2018 ◽  
Vol 910 ◽  
pp. 137-142
Author(s):  
Kazumasa Kitazono ◽  
Hiroshi Fukuoka ◽  
Nao Kuniyoshi ◽  
Minoru Yaga ◽  
Eri Ueno ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Vortex Ring ◽  
Stokes Equations ◽  
Pressure Ratio ◽  
Supersonic Jet ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Navier Stokes ◽  
Vortex Rings ◽  
Thermodynamic Conditions

Pulsed laser ablation with an elliptical cell gives well-defined thermodynamic conditions to the growth of high-quality thin films. The unsteady supersonic jet formed by the shock tube with small high-pressure chamber was used as a simple alternative model of pulsed laser ablation. The vortex ring formed by the shock wave is important to reveal behavior of unsteady supersonic jet discharged from elliptical cell. However, there has been little effort to investigate the interaction between the vortex ring and the jet. The purpose of the present study is to investigate the behavior of the vortex rings and the jet. The experiment and numerical calculation were carried out by schlieren method and by solving the axisymmetric two-dimensional compressible Navier-Stokes equations, respectively. The system of the calculation and the experiment is a model of laser ablation of a certain duration followed by a discharging process through the exit. Moreover, a parametric study was performed to demonstrate the effect of pressure ratio on the interaction among vortex rings and the supersonic jet. The interaction between the supersonic jet and the vortex rings increased the velocity of the supersonic jet up to the magnitude of the velocity at the center of the vortex rings. Closing a distance between the vortex ring and the jet is higher interaction between the vortex rings.

Synthesis and Characterization of Gold-Silver Nanoparticles in Deionized Water by Pulsed Laser Ablation (PLAL) Technique at Different Laser Parameter

2019 ◽  
Vol 18 (01) ◽  
pp. 1850015
Author(s):  
W. Norsyuhada ◽  
W. Mohd Shukri ◽  
Hazri Bakhtiar ◽  
Shumaila Islam ◽  
Noriah Bidin
Keyword(s):  
Silver Nanoparticles ◽  
Laser Ablation ◽  
Yttrium Aluminum Garnet ◽  
Focal Point ◽  
Minimum Energy ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Deionized Water ◽  
Gold Silver ◽  
Silver Nps

Gold and silver nanoparticles (NPs) are physically synthesized using Q-switched neodymium-doped yttrium aluminum garnet (Nd:YAG)-pulsed laser ablation in liquid (PLAL) technique which is a rapid, simple and efficient one-step synthesis. The gold and silver colloidal solutions are separately prepared by 1064[Formula: see text]nm of pulsed laser ablation of metallic target (gold and silver) which is immersed in deionized water. Ultraviolet–visible spectroscopy (UV–Vis) analysis shows the absorption band of gold and silver NPs at [Formula: see text][Formula: see text]nm and [Formula: see text][Formula: see text]nm, respectively. The absorption spectra and color variations of gold and silver NPs at three different laser parameters (output laser energies, target distances from focal point and laser time exposures). High-resolution transmission electron microscopy shows the spherical shape of gold and silver NPs with 34[Formula: see text]nm and 33[Formula: see text]nm diameter of size, respectively, are reported. The aggregation and particle sizes of gold and silver NPs due to minimum energy (75[Formula: see text]mJ) and maximum energy (311[Formula: see text]mJ) are observed.

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