Estimation of bubble fusion requirements during high-pressure, high-temperature cavitation

5^th World Congress on Physics

July 17-18, 2018 Prague, Czech Republic

Toshihiko Yoshimura, Hiroyuki Yoshiya, Kumiko Tanaka and Masataka Ijiri

Sanyo-Onoda City University, Japan

Posters & Accepted Abstracts: J Laser Opt Photonics

Abstract :

Taleyarkhan’s group at Oak Ridge National Laboratory (USA) have claimed to have found evidence of nuclear fusion in a beaker filled with an organic solvent subjected to ultrasonic irradiation. The bubbles produced by UC, a technique commonly employed in sonochemistry, are typically several micrometers in size, and their collapse can generate microjets with temperatures of several thousand degrees Celsius. In contrast, bubbles produced by water jet (or liquid jet) cavitation methods, such as floating cavitation, are several hundred micrometers in size, and their collapse produces microjets with high pressures of approximately 1.0 GPA. For many years, fusion reactions have been used to raise the temperature of plasmas to investigate several aspects of this state of matter, including the external energy required to increase the temperature of plasma, the conditions of plasma at its critical point, and deuterium–tritium (D–T) reactions. It has been found that, for nuclear fusion to occur, it is necessary for the original nuclei to collide at a speed of over 1.0×103 km/s. Thus, the nuclei must experience a pressure of 1.0×1011 atm and a temperature of 1.0×108°C. In the present study, a new cavitation method termed multifunction cavitation (MFC), which combines the characteristics of both UC and water jet cavitation, was applied to the study of bubble fusion. The cavitation velocity and the pressure and temperature inside a bubble in deuterated acetone when employing MFC were estimated theoretically and compared to the values required for fusion. During MFC, as the bubble shrinks to 100 to 0.1 μm, the pressure and temperature inside the bubble drastically increase, possibly leading to temperature and energy density that satisfy the conditions of bubble fusion.

Biography :

E-mail: yoshimura-t@rs.tusy.ac.jp