Super-mixing combustion enhanced by resonance between micro-shear layer and acoustic excitation

Yoshida, Hideto; Koda, Motoi; Ooishi, Yasushi; Kobayashi, Kenichi; Saito, Masakatsu

doi:10.1016/s0142-727x(01)00103-5

Cited by 23 publications

(12 citation statements)

References 4 publications

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“…As the excitation frequency is close to the frequency of selfsustained flapping oscillation, the two planar opposed jets exhibit excited deflecting oscillation. This interesting phenomenon may be caused by the resonance between the excitation and self-sustained flapping oscillation, which has also been reported in the jet with excitation (Staubli and Rockwell, 1987;Yoshida et al, 2001;Arthurs and Ziada, 2012). The excited deflecting oscillation is absent in Reactor I, as the results of our recent study show that the deflecting oscillation does not occur in T-jets reactors similar to Reactor I (Tu et al, 2014b).…”

Section: Resultssupporting

confidence: 60%

Experimental study on oscillation behaviors in T-jets reactor with excitation

Qian

et al. 2015

Chemical Engineering Science

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Section: Resultssupporting

confidence: 60%

Experimental study on oscillation behaviors in T-jets reactor with excitation

Qian

et al. 2015

Chemical Engineering Science

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“…49,50) These findings have motivated extensive investigations on application of the acoustic oscillations to improve the process performances in combustion, environmental and waste treatment technologies. The results of these investigations have strongly suggested that forced acoustics offers very attractive possibilities for designing high temperature processes with improved combustion efficiency and low pollutant emission.…”

Section: Forced Acoustic Oscillations In Combustion Andmentioning

confidence: 99%

“…when the frequency of imposed oscillations was adjusted to the natural frequency of the combustor chamber. Yoshida et al 50) studied behaviors of diffusion methane flame under an acoustic excitation at resonance frequencies of 900, 1 350 and 2 200 Hz and SPL of 112 dB. Their results showed that at the resonance conditions, the turbulent intensity of the flow increases markedly, the flame becomes much wider and shorter than that without excitation.…”

Section: Improvement In Fuel Combustion Efficiencymentioning

confidence: 99%

High Power Ultrasonics in Pyrometallurgy: Current Status and Recent Development

2005

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In recent years, a large number of studies have been published on the use of high intensity ultrasonics in various high temperature technologies. This paper provides an overview of the recent achievements and ongoing works on the application of high intensity sound waves to pyrometallurgy and its related areas. The published results have strongly suggested that ultrasonics has the potential to play a more significant role in such areas as the dedusting of high-temperature exhaust gas, improvement of fuel-combustion efficiency, control of air-pollutant emissions, improvement of the quality of ingots, production of metal powders and ascast composite materials.At higher temperatures, special attractiveness of sound waves is associated with the fact that the waves can propagate through gas, liquids, and solids, and thus supply the acoustic energy from a cooled sonic generator to materials being processed under high temperature conditions. This provides a unique tool, for example, for controlling the rates of interfacial phenomena that is unachievable by any other methods under high temperatures.Industrial competitiveness of the ultrasonic-based technologies is reinforced by the relatively low cost of power-generating equipment and ultrasonic transducers. However, further research efforts are called for to develop new heat-resistant waveguide materials and to integrate the ultrasonic installations with existing industrial facilities in high temperature technologies.KEY WORDS: pyrometallurgy; high temperature; sonoprocessing; high power ultrasonics; non-linear phenomena; air pollutants; continuous casting; melt atomization; cast composites.applications have been summarized in a book by one of the authors of the present review. 4)The following two circumstances make ultrasonics especially applicable to high-temperature technologies: 1) There is a severely limited choice of techniques available for supplying energy under conditions involving higher temperatures. Among these techniques, sonic/ ultrasonic treatment or sonoprocessing should be competitive as regards both technique and cost, because it provides an effective transmission of acoustic energy from the ultrasonic generators to the materials being processed at a relatively low cost for ultrasonic equipment. 2) It is well-known that interfacial phenomena play an important role in governing many high-temperature processes. Examples are mass and heat transfer, crystal growth during the solidification of liquid metals, wetting, and emulsification. Sonic and ultrasonic waves propagate through homogeneous elastic mediums without significant losses. However, when the waves are incident upon an interface, the scattering or reflecting or of the waves from the interface is responsible for a number of nonlinear phenomena that occur at the interfaces. These provide a unique tool for controlling the rates of interfacial phenomena. Such a tool is unachievable by any other methods. Along with improvements in the earlier methods of sonoprocessing, a number of new ultrasonic appl...

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“…Consequently, several researches have been conducted to understand how the presence of the acoustic oscillation can change the flame structure and the impact on the pollutants emissions. Yoshida et al (2001) have studied the presence of an acoustic field in turbulent jet diffusion flames, and they observed that at the resonant conditions the transient from laminar to turbulent flow is enhanced, and consequently the turbulent intensity of the flow increases markedly. But the long predominantly diffusive flames are normally not able to auto-excite acoustically the confined combustion, neither to amplify the oscillations in the case of external actuation, as presented by Ferreira et al (2006).…”

Section: Introductionmentioning

confidence: 99%

“…As the presence of oscillations increases the turbulence level (Yoshida et al, 2001) and the oxygen in the inner side of the flame (Turns, 1996), there are expectations of lower soot formation and enhancement of soot reduction. Saito et al (1998) have studied the soot suppression by acoustic oscillated combustion in free diffusion flames.…”

Section: Introductionmentioning

confidence: 99%