On The Possibility of Grinding Solid Particles of a Dispersed-Phase Suspension in a High-Speed Rotary Disperser
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ON THE POSSIBILITY OF GRINDING SOLID PARTICLES OF A DISPERSED-PHASE SUSPENSION IN A HIGH-SPEED ROTARY DISPERSER V. A. Avrorov
UDC 66.063:66.963
Conditions for grinding particles comprising the dispersed phase of a suspension when it moves in the holes of the rotor and stator of a high-speed rotary disperser are considered. The obtained dependences are used to determine the conditions for the destruction of the particles into smaller components at the moment of their impact on the faces of the rotor and stator holes, allowing the selection of rational technical disperser parameters. Keywords: suspension, disperse phase, particle size reduction phase, rotor and stator holes, rotary disperser.
One of the current techniques for improving the quality indicators of liquid media (emulsions and suspensions) involves the use of impulse impacts on the processed liquid medium to provide a significant intensification of the technological process [1–4]. In practice, interrelated and interacting intensification approaches are used, including regime-technological and constructive-apparatus ones. In the developed rotary disperser [5] (in contrast to the known treatment methods used, for example, in devices with nozzles or in centrifugal and pneumatic sprayers [6–10]), the treated medium is subjected to periodic impulses contributing to its intensive diffusion at the outlet of the apparatus. The intensity of these effects depends on the rotor speed and on the number of holes in the rotor and stator for the exit of liquid jets. Periodic impulse effects on the processed medium can be caused by forced vibrations of the elements of the technical device (for example, additional vibration characterized by vibration displacement, vibration velocity, and vibration acceleration [11]), or created directly in the medium. In a high-speed rotary disperser [5], forced vibrations of elements are not applied: the effect on the medium is achieved solely by creating a pulsating mode of motion in the liquid [12]. Particles of the dispersed phase in the disperser are subjected to a mechanical shock effect arising from periodic overlapping of the rotor and stator holes (when the particles come into contact with the edges of the holes). The impact of particles on the edges of the holes, as well as the “jamming” of particles between the edges, when the transverse size of the particles becomes larger than the decreasing gap between the holes, contribute to the appearance of shear forces, ultimately leading to the destruction of particles of the suspension dispersed phase. The present study is aimed at obtaining analytical dependences determining the conditions for the destruction of particles of the suspension dispersed phase during their contact with the sharp edges of the holes in the rotor and stator of the disperser. Interaction Models of Suspension Dispersed Phase Particles with the Rotor and Stator Holes For the purposes of modeling, the following assumptions were made: – the hardness of the rotor and stator material exceeds the hardness of the dis
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