Interaction of an underwater shock wave with a gas bubble

1995 ◽  
pp. 161-170
Author(s):  
Kiyoshi Yamada ◽  
Kazuyoshi Takayama
Keyword(s):  
Shock Wave ◽  
Gas Bubble ◽  
Underwater Shock Wave ◽  
Underwater Shock

Propagation of Underwater Shock Wave and Gas Bubble Behavior Induced by Electrical Discharge in Water

2014 ◽  
Vol 566 ◽  
pp. 403-408
Author(s):  
Hideki Hamashima ◽  
Seisaku Iwasa ◽  
Hironori Maehara ◽  
Shigeru Itoh ◽  
Kazuyuki Hokamoto
Keyword(s):  
Numerical Simulation ◽  
Shock Wave ◽  
Electrical Discharge ◽  
High Speed ◽  
Optical Observation ◽  
Gas Bubble ◽  
Bubble Behavior ◽  
Underwater Shock Wave ◽  
Whole Process ◽  
Underwater Shock

The basic behavior during underwater electrical discharge up to 10 kJ stored energy is investigated through both numerical analysis and optical-observation experiments. Since the authors have been investigating the use of underwater exploding phenomena for food processing and other applications, it is necessary to know the whole process which may affect the quality of the samples recovered. In the present investigation, the propagation of underwater shock wave was measured using a high-speed camera and compared with the numerically simulated results using LS-DYNA. Also, the motion of gas bubble, which is induced quite after the propagation of the shock wave, was measured and compared with the numerical simulation using the same code. The pressure of the bubble is not such high as the shock wave, but it is known that the impulse is not possible to be ignored due to its relatively long duration of the pressurization. Through a series of optical-observation experiments, it is confirmed that the numerical simulation is potentially possible to predict the whole phenomena for processing foods and other materials.

Explosive Welding Using Underwater Shock Wave Generated by the Detonation of the Detonating Code

2011 ◽  
Vol 673 ◽  
pp. 265-270 ◽  
Author(s):  
Akihisa Mori ◽  
Li Qun Ruan ◽  
Kazumasa Shiramoto ◽  
Masahiro Fujita
Keyword(s):  
Shock Wave ◽  
Sound Velocity ◽  
Detonation Velocity ◽  
Explosive Welding ◽  
New Method ◽  
Underwater Shock Wave ◽  
Metal Plates ◽  
Experimental Parameters ◽  
Underwater Shock ◽  
Point Velocity

Detonating code is a flexible code with an explosive core. It is used to transmit the ignition of explosives with high detonation velocity in the range of 5.5 to 7 km/s. However, it is difficult to use detonating code for the explosive welding of common metals since the horizontal point velocity usually exceeds the sound velocity. Hence, in the present work, a new method using underwater shock wave generated by the detonation of detonating code was tried. The details of the experimental parameters and the results are presented. From the results it is observed that the above technique is suitable to weld thin metal plates with relatively less explosives.

Von Neumann reflection of underwater shock wave

1999 ◽  
Vol 85 (1-3) ◽  
pp. 48-51 ◽  
Author(s):  
Y Nadamitsu ◽  
Z.Y Liu ◽  
M Fujita ◽  
S Itoh
Keyword(s):  
Shock Wave ◽  
Underwater Shock Wave ◽  
Von Neumann ◽  
Underwater Shock

Numerical Simulation on Explosive Welding Process Using Reflected Underwater Shock Wave

2007 ◽  
Vol 566 ◽  
pp. 309-314
Author(s):  
Kazumasa Shiramoto ◽  
Masahiro Fujita ◽  
Yasuhiro Ujimoto ◽  
Hirofumi Iyama ◽  
Shigeru Itoh
Keyword(s):  
Numerical Simulation ◽  
Shock Wave ◽  
Explosive Welding ◽  
Welding Process ◽  
Underwater Shock Wave ◽  
Underwater Shock ◽  
Effective Use

The paper describes a numerically simulated result for the explosive welding using reflected underwater shock wave. Through the numerical simulation, the effective use of reflected underwater shock wave was clearly suggested and the method to improve the assembly was demonstrated.

An underwater shock wave research device

1991 ◽  
Vol 62 (7) ◽  
pp. 1849-1854 ◽  
Author(s):  
Fernando E. Prieto ◽  
Achim M. Loske ◽  
Frederick L. Yarger
Keyword(s):  
Shock Wave ◽  
Underwater Shock Wave ◽  
Wave Research ◽  
Underwater Shock
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