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Kyuichi Yasui,Teruyuki Kozuka,Masaki Yasuoka,Kazumi Kato 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.10
There are two major categories in a thermoacoustic prime-mover. One is the traveling-wave type and the other is the standing-wave type. A simple analytical model of a standing-wave thermoacoustic prime-mover is proposed at relatively low heat-flux for a stack much shorter than the acoustic wavelength, which approximately describes the Brayton cycle. Numerical simulations of Rott’s equations have revealed that the work flow (acoustic power) increases by increasing of the amplitude of the particle velocity (|U|) for the traveling-wave type and by increasing cos for the standing-wave type, where is the phase difference between the particle velocity and the acoustic pressure. In other words, the standing-wave type is a phase-dominant type while the traveling-wave type is an amplitude-dominant one. The ratio of the absolute value of the traveling-wave component (|U|cos) to that of the standing-wave component (|U|sin) of any thermoacoustic engine roughly equals the ratio of the absolute value of the increasing rate of |U| to that of cos. The different mechanism between the traveling-wave and the standing-wave type is discussed regarding the dependence of the energy efficiency on the acoustic impedance of a stack as well as that on !, where ! is the angular frequency of an acoustic wave and is the thermal relaxation time. While the energy efficiency of the traveling-wave type at the optimal ! is much higher than that of the standing-wave type, the energy efficiency of the standing-wave type is higher than that of the traveling-wave type at much higher ! under a fixed temperature difference between the cold and the hot ends of the stack.
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A new ultrasonic cavitation approach for the synthesis of zinc ferrite nanocrystals
Manickam Sivakumar,Atsuya Towata,Kyuichi Yasui,Toru Tuziuti and Yasuo Iida,Yasuo Iida 한국물리학회 2006 Current Applied Physics Vol.6 No.3
An ultrasound mediated simple emulsion process has been demonstrated for the synthesis of zinc ferrite nanocrystals using the pre-cursors of zinc and iron acetates and rapeseed oil. Following this technique avoids many of the outstanding problems that normally existin conventional emulsion synthesis. Due to the simplicity of this process, it could also become a valuable starting point for the generationof other mixed and complex ferrites.
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