Food Processing Trials Using Underwater Shock Wave by Electrical Discharge

2013 ◽  
Vol 767 ◽  
pp. 223-228 ◽  
Author(s):  
Seisaku Iwasa ◽  
Hironori Maehara ◽  
Masatoshi Nishi ◽  
Shigeru Tanaka ◽  
Toshiaki Watanabe ◽  
...  
Keyword(s):  
Shock Wave ◽  
Cold Water ◽  
Dynamic Pressure ◽  
New Method ◽  
Underwater Shock Wave ◽  
Running Water ◽  
Wire Explosion ◽  
Frozen Food ◽  
Underwater Shock ◽  
High Dynamic

We propose a new method for the efficient decompression of frozen food under high dynamic pressure. Two experiments are conducted on an ice block containing peeled shrimp: wire explosion and underwater shock wave. In these experiments, the ice is finely crushed, while the frozen peeled shrimps retain their original shape and can be efficiently extracted. Since ice crushing is performed momentarily, the defrosting time is significantly shorter than that in traditional thawing techniques, such as melting in running water or cold-water soaking. This new method could increase the efficiency of food production processes.

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.

Numerical Simulation of Electrical Discharge Characteristics Induced by Underwater Wire Explosion

2018 ◽  
Vol 910 ◽  
pp. 72-77
Author(s):  
Ryo Henzan ◽  
Yoshikazu Higa ◽  
Osamu Higa ◽  
Ken Shimojima ◽  
Shigeru Itoh
Keyword(s):  
Numerical Simulation ◽  
Shock Wave ◽  
Electrical Discharge ◽  
Electrical Energy ◽  
Underwater Shock Wave ◽  
Discharge Characteristics ◽  
Wire Explosion ◽  
Electrical Wire ◽  
Electrical Wire Explosion ◽  
Underwater Shock

The underwater shock-wave phenomenon has been applied in various fields such as manufacturing and food processing and was investigated using many experimental and numerical analyses in the past. An underwater shock-wave is produced by various methods, e.g., underwater wire explosion and pulse-gap electrical discharge. Therefore, clarifying the shock characteristics depending on the stored electrical energy, wire dimension and material is extremely important. However, predicting the pressure and its distribution induced by underwater electrical wire explosion is hard because the phenomena associated with an elementary process are significantly complicated. In this study, to predict the discharge characteristics induced by underwater electrical wire explosion, numerical simulation based on the “simplified model of underwater electrical discharge” was performed. The numerical results show good agreement with the experimental ones.

309 A New Method of Explosive Welding Using Concentrating Underwater Shock Wave

2001 ◽  
Vol 2001.9 (0) ◽  
pp. 109-110
Author(s):  
Kazumasa SHIRAMOTO ◽  
Akio KIRA ◽  
Masahiro Fujita ◽  
Akihisa Mori ◽  
Kazuyuki HOKAMOTO ◽  
...  
Keyword(s):  
Shock Wave ◽  
Explosive Welding ◽  
New Method ◽  
Underwater Shock Wave ◽  
Underwater Shock

A New Method of Explosive Welding Performed by Effective Application of Reflected Underwater Shock Wave

2006 ◽  
Author(s):  
Kazumasa Shiramoto ◽  
Masahiro Fujita ◽  
Hirofumi Iyama ◽  
Yasuhiro Ujimoto ◽  
Shigeru Itoh
Keyword(s):  
Shock Wave ◽  
Explosive Welding ◽  
Underwater Explosion ◽  
Shock Pressure ◽  
Experimental Results ◽  
New Method ◽  
Underwater Shock Wave ◽  
Effective Application ◽  
Welding Method ◽  
Underwater Shock

In this report, we propose a new explosive welding method, and the welding is performed at employing underwater shock pressure produced by the underwater explosion of an explosive placed at one side almost vertical to the specimen to be welded. In order to prevent the reduction of the shock pressure with the distance away from explosive, a steel reflector is placed over the area of the specimen. The effects of the reflector are investigated based on the experimental results and the process is numerically analyzed results.

Research on the Underwater Shock Wave Generated by Discharge of High Voltage Impulsive Current

2005 ◽  
Author(s):  
Masahiko Otsuka ◽  
Kouhei Inoue ◽  
Shigeru Itoh
Keyword(s):  
Shock Wave ◽  
High Voltage ◽  
High Energy ◽  
Resistance Rate ◽  
Pulsed Power ◽  
Metal Wire ◽  
Underwater Shock Wave ◽  
Wire Explosion ◽  
Underwater Shock ◽  
Velocity Pressure

The high energy generated from electric pulsed power has various applications. We investigated the underwater shock wave generated by the metal wire explosion and the electric discharge of electrode using high voltage impulsive current. This investigation was performed using optical observation, pressure measurement and current measurement. In the case of metal wire explosion, the velocity, pressure and the current value of underwater shock wave obtained from the experimental data is proportional to the electric resistance rate. In the other case, the discharge from the electrode, the velocity of the underwater shock wave generated by the discharge of electrode with metal wire explosion is faster than the underwater shock wave generated by the discharge of the electrode without metal wire.

On Study of Free Metal Forming Using Underwater Shock Wave

2002 ◽  
Author(s):  
Shigeru Itoh ◽  
Hirofumi Iyama ◽  
K. Raghukandan ◽  
Shiro Nagano ◽  
Ryo Matsumura ◽  
...  
Keyword(s):  
Shock Wave ◽  
High Explosive ◽  
Dynamic Pressure ◽  
Powder Materials ◽  
Underwater Shock Wave ◽  
Powder Consolidation ◽  
Underwater Shock ◽  
Overdriven Detonation ◽  
The Given ◽  
Basic Configuration

In the material processing such as shock synthesis and powder consolidation by shock waves the method for generating dynamic pressure is of very importance for the final recovered materials. A general and convenient way for producing shock wave needed in such field is to take advantage of the explosion effect from high explosive. Therefore, it becomes an interest subject how to produce dynamic pressure as high as possible under the given high explosive. Starting from this motivation, we put forward a method of high-pressure generation by using the overdriven detonation of high explosive. The basic configuration for this device is summarized in the following. A metal flyer accelerated by the high explosive is used to impact another layer of high explosive to incur an overdriven detonation in this layer of explosive. The overdriven detonation of high explosive acts on the powder materials, providing the high dynamic pressure for it. To examine the efficiency of this combination, a numerical computation is performed to this system. The details on the illustration of this system and numerical treatment will be given.

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.

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