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Your search keyword '"Shalunov, A. V."' showing total 199 results
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199 results on '"Shalunov, A. V."'

10. Effectiveness of using acoustic oscillations of ultrasonic frequency on the process of removing moisture from porous material

Author

Nesterov Victor A., Khmelev Vladimir N., Terentiev Sergey A., Tertishnikov Pavel P., and Shalunov Andrey V.

Subjects
Environmental sciences, GE1-350
Abstract

The article presents the results of a study of the ultrasonic drying process which is a promising way to intensify the process of moisture removal at low temperatures. An experimental stand was developed for the research. The stand is an ultrasonic dryer with automatic maintenance of the set temperature. A flexural-oscillating disk radiator was used as a source of ultrasonic action. The conducted studies have shown that changing the speed of the drying agent from 0.1 m/s to 0.2 m/s during convective drying can slightly reduce the drying time from 100 minutes to 90 minutes (10%). Change of the speed of the drying agent from 0.1 m/s to 0.2 m/s allows reducing the drying time by 10 minutes, from 80 minutes to 70 minutes with ultrasonic action. Due to the ultrasonic exposure at a drying agent speed of 0.2 m/s, the drying time is reduced from 90 minutes to 70 minutes. At a drying agent temperature of 400C, the drying time is reduced by 25% due to ultrasonic exposure (from 160 minutes to 120 minutes).

Published
2023
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14. Influence of vortex acoustic flows on compaction of aerosol particle cloud.

Author

Shalunov, Andrey V. and Khmelev, Vladimir N.

Subjects
*SOUND pressure, *AEROSOLS, *COAGULATION, *ACOUSTIC field, *SONAR, *COMPACTING, *PHENOMENOLOGICAL theory (Physics)
Abstract

The search for physical effects that contribute to the compaction of the cloud of aerosol particles is an urgent task. An analysis of nonlinear physical phenomena that occur during the formation of an acoustic field made it possible to establish that vortex acoustic flows turn out to be a significant factor in resonant oscillations of the gas gap, which, due to inertia forces, can cause local compaction of the aerosol cloud. A model similar to the discrete phase approach is proposed, which is capable of calculating the motion of an aerosol cloud. The possibility of a local increase in concentration by more than 2 times when exposed to a resonant air gap has been proven. It has been established that the maximum concentration of the aerosol cloud is achieved in areas with the maximum sound pressure level, which additionally contributes to an increase in the efficiency of coagulation. However, the maximum achievable degree of increase in concentration in the range of sound pressure levels from 150 to 155 dB decreases with increasing level. At the same time, with an increase in the level of sound pressure, the time to reach the maximum increase in concentration is reduced and, as is known, the efficiency of coagulation increases. This indicates the need to find the optimal sound pressure level for coagulation in the air gap. [ABSTRACT FROM AUTHOR]

Published
2024
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15. Method for increasing efficiency of ultrasonic coagulation due to secondary acoustic effects.

Author

Shalunov, Andrey V. and Bochenkov, Alexander S.

Subjects
*COAGULATION, *STANDING waves, *ULTRASONICS, *COLLISIONS (Nuclear physics)
Abstract

The paper considers the use of an ultrasonic disk emitter capable of generating secondary acoustic effects that allow particles to move within the nodal regions of a standing wave and between them, thereby increasing the time of exposure to each particle to increase the efficiency of coagulation. Such exposure significantly increases the probability of collision of particles smaller than 2.5 µm, and, consequently, increases the coagulation efficiency to 96-98%. [ABSTRACT FROM AUTHOR]

Published
2024
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