SHADOWGRAPHY OF SHOCK WAVE INDUCED BY DOUBLE PULSE TECHNIQUE

2015 ◽  
Vol 74 (8) ◽  
Author(s):  
Waskito Nugroho ◽  
N. E. Khamsan ◽  
M. Abdullah ◽  
K. Ganesan
Keyword(s):  
Shock Wave ◽  
Nd:Yag Laser ◽  
High Speed ◽  
Laser System ◽  
Optical Breakdown ◽  
Video Camera ◽  
Double Pulse ◽  
Pulse Technique ◽  
Camera Synchronization ◽  
Wave Induced

High-speed videography based on double pulse of Nd:YAG laser to capture dynamic expansion of shock wave is reported. A Q-switched Nd:YAG laser was employed  as an input signal and disturbance source. Nitrodye laser was utilized as a flash. The shock wave generation was recorded via CCD video camera. Synchronization is organized associated with a digital delay generator. Nd:YAG laser was focused to generate an optical breakdown in distilled water. Double pulses were generated within the interval of one second. The first pulse of Nd:YAG laser was used to trigger the dye laser and the second pulse to generate shock wave. Manipulation of delay times allow to freeze the dynamic expansion of shock wave. The double pulse technique is appropriated for laser system with the absence of external trigger unit. Lack of electronic failure is the advantage offer by the double pulse technique.

Behavior of Bubble in Small Water Tank Used for Food Processing Using Underwater Shock Wave

2011 ◽  
Vol 673 ◽  
pp. 225-230 ◽  
Author(s):  
Hideki Hamashima ◽  
Manabu Shibuta ◽  
Shigeru Itoh
Keyword(s):  
Numerical Simulation ◽  
Shock Wave ◽  
Food Processing ◽  
High Speed ◽  
Underwater Explosion ◽  
Video Camera ◽  
Experimental Result ◽  
Water Tank ◽  
Underwater Shock Wave ◽  
Small Water

The food processing technology using a shock wave can prevent deterioration of the food by heat because it can process food in a short time. Generally, since the shock wave used for food processing is generated by underwater explosion, the load of a shock wave to the food becomes very complicated. Therefore, in order to process safely, it is important to clarify the behaviors of the shock wave and the bubble pulse generated by underwater explosion. In this research, in order to investigate the behavior of the shock wave in the water tank used for food processing, the optical observation experiment and the numerical simulation were performed. In the experiment, the shock wave generated by underwater explosion was observed with the high-speed video camera. The numerical simulation about the behavior of bubble pulse was performed using analysis software LS-DYNA. Comparing and examining were performed about the experimental result and the numerical simulation result. The result of the numerical simulation about the behavior of the shock wave generated by underwater explosion and the shock wave generated by the bubble pulse and the bubble pulse was well in agreement with the experimental result.

A simple model for the shock wave induced by high-speed impact.

1972 ◽  
Vol 9 (1) ◽  
pp. 13-18 ◽  
Author(s):  
PETER J. TORVIK ◽  
RONALD J. F. PRATER
Keyword(s):  
Shock Wave ◽  
Simple Model ◽  
High Speed ◽  
High Speed Impact ◽  
Wave Induced

Development of Pressure Vessel for Food Processing

2010 ◽  
Author(s):  
Hideki Hamashima ◽  
Manabu Shibuta ◽  
Yosuke Nishimura ◽  
Shigeru Itoh
Keyword(s):  
Shock Wave ◽  
Pressure Vessel ◽  
Food Processing ◽  
High Speed ◽  
Health And Safety ◽  
Processing System ◽  
Underwater Explosion ◽  
Video Camera ◽  
Numerical Calculations ◽  
Shock Propagation

On the food processing using the shock wave, we have developed the pressure vessel with the device generating the shock wave. By using the silicone rubber as a medium for the shock waves transported to the foods, the processing system that established the health and safety was constructed. The food processing was performed using the shock wave generated by the high power spark. In this research, in order to confirm the mechanism for the shock propagation on the food processing, the experiments and numerical calculations about the underwater explosion using an explosive were performed. In the experiment, the process of the propagation of shock wave and the bubble gas generated by the explosion was observed by the high-speed video camera. The numerical calculations for the shock propagation on the food processing were performed by using the general-purpose software LS-DYNA using the Finite Element Method. The experimental and numerical results were examined. According to the results, some points of the mechanism of the shock propagation and the bubble gas on the food processing were clarified.

scholarly journals Breakup and interaction of two droplet columns in a shock wave induced high-speed air flow.

1989 ◽  
Vol 55 (514) ◽  
pp. 1607-1612
Author(s):  
Teruhiko YOSHIDA ◽  
Kazuyoshi TAKAYAMA ◽  
Andrzej Wierzba
Keyword(s):  
Shock Wave ◽  
High Speed ◽  
Air Flow ◽  
Wave Induced

DETERMINATION SOUND SPEED OF METAL IN AQUEOUS SOLUTION VIA LASER INDUCED ACOUSTIC WAVE TECHNIQUE

2016 ◽  
Vol 78 (3) ◽  
Author(s):  
Maisarah Duralim ◽  
Noriah Bidin ◽  
Waskito Nugroho ◽  
Jasman Zainal
Keyword(s):  
Shock Wave ◽  
Aqueous Solution ◽  
Acoustic Wave ◽  
Sound Speed ◽  
High Speed ◽  
Optical Breakdown ◽  
High Speed Photography ◽  
Nonlinear Phenomena ◽  
Metal Element ◽  
Laser Induced Breakdown

Laser induced breakdown and shock wave propagation are nonlinear phenomena. The high temperature and high pressure associated with plasma formation offering a lot advantages in industrial and scientific research.  However not many realized that the end  product of nonlinear effect such as the generation of acoustic wave will also attribute to significant impact. Thus the intention of this study is to materialize the usefulness of such acoustic wave for determination the sound speed of metal element like Pb, Hg and K in aqueous solution. In this attempt a Q-switched Nd:YAG laser was focused to induce optical breakdown and its associated shock wave generation which later  follow by the generation of acoustic wave. The phenomenon is observed in conjunction with high speed photography based shadowgraph technique. The experimental results of sound speed for K, Hg and Pb is found in good agreement with the standard value from references. This confirmed that laser induced acoustic wave will be other alternative method for measuring sound speed for metal element in periodic table.

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