Frequency dependence of the acoustic agglomeration rate of a glycolfog

Magill, J.; Caperan, Ph.; Somers, J.; Richter, K.; Rodriguez-Corral, G.; Sarabia, E. Riera‐Franco de; Gallego-Juárez, J.A.

doi:10.1016/s0021-8502(05)80026-6

Cited by 17 publications

(8 citation statements)

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“…8) In succeeding years, many new studies were carried out with the use of more advanced instruments. [33][34][35] The obtained results allowed researchers to fill a lack of knowledge about key parameters influencing the acoustic coagulation. On the whole, the results confirmed the most of the earlier stated hypotheses on the acoustic coagulation mechanism.…”

Section: Acoustically Assisted Dedusting Of High Tempera-mentioning

confidence: 93%

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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Section: Acoustically Assisted Dedusting Of High Tempera-mentioning

confidence: 93%

High Power Ultrasonics in Pyrometallurgy: Current Status and Recent Development

2005

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“…Actually, a higher concentration means a smaller mean spacing between particles in the aerosol system. For Magill et al (1991) experiments, the amplitude of particle vibration in the two higher initial concentration cases is comparable to the initial mean spacing between particles. In this circumstance, the orthokinetic interaction is expected to play an important role, as a result, applying the Or-Song/Hy-König combination can catch the early stage agglomeration of these two cases (see solid and dash curves in Fig.…”

Section: Simulation Of Experimentsmentioning

confidence: 89%

“…The experimental data used are mainly taken from Capéran et al (1995a) and from Magill et al (1991). The experiments were performed in a cylindrical chamber with a diameter of 0.7 m and a length of 1.4 m as used by Capéran et al and in a slightly smaller chamber with a diameter of 0.62 m and a length of 1.3 m as used by Magill et al The aerosols used were generated by the evaporation and condensation of a commercial liquid, Safex (mainly glycol).…”

Section: Implementation Of Simulation and Validationmentioning

confidence: 99%

“…The experiments were performed in a cylindrical chamber with a diameter of 0.7 m and a length of 1.4 m as used by Capéran et al and in a slightly smaller chamber with a diameter of 0.62 m and a length of 1.3 m as used by Magill et al The aerosols used were generated by the evaporation and condensation of a commercial liquid, Safex (mainly glycol). The fresh aerosol had an approximately lognormal particle size distribution with a geometric mean diameter of 0.8 m and a standard deviation of 1.3 (1.35 reported in Magill et al, 1991). The acoustic treatments were conducted using travelling waves with various acoustic frequencies and powers.…”

Section: Implementation Of Simulation and Validationmentioning

confidence: 99%

“…Fig. 6 shows a comparison of the simulation results with the experimental data of Magill et al (1991), where four initial concentrations were tested. In Fig.…”

Section: Simulation Of Experimentsmentioning

confidence: 99%

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