Technology, energy, agriculture transport AIC

Andriy MARTYNYUK – Candidate of Technical Sciences, Associate Professor of the Department of Branch Mechanical Engineering and Agricultural Engineering of the Khmelnytskyi National University (11, Instytutska St., Khmelnytskyi, 29016, Ukraine, e-mail: avmart@khmnu.edu.ua, https://orcid.org/0000-0001-8277-1308).

Myroslav STECHYSHYN – Doctor of Technical Sciences, Professor of the Department of Branch Mechanical Engineering and Agricultural Engineering of the Khmelnytskyi National University (11, Instytutska St., Khmelnytskyi, 29016, Ukraine, e-mail: miro011951@gmail.com, https://orcid.org/0000-0001-5780-2790).

Mykola BORYS – Candidate of Technical Sciences, Associate Professor of the Department of Branch Mechanical Engineering and Agricultural Engineering of the Khmelnytskyi National University (11, Instytutska St., Khmelnytskyi, 29016, Ukraine, e-mail: myk0borys@gmail.com, https://orcid.org/0000-0003-0677-9505).

Victor FEDORIV – Candidate of Technical Sciences, Associate Professor of the Department of Branch Mechanical Engineering and Agricultural Engineering of the Khmelnytskyi National University (11, Instytutska St., Khmelnytskyi, 29016, Ukraine, e-mail: fedoriv55@ukr.net, https://orcid.org/0000-0002-4499-0910).

The article investigates the influence of kinematic parameters on the velocity of grain material movement along the working surface of the rotor in a vibro-centrifugal separator. The relevance of the study is determined by the need to increase the efficiency of cleaning and sorting processes of grain mixtures through the use of centrifugal and vibration fields, which enhance the differences between particles in terms of specific mass and aerodynamic properties. The paper examines the mechanics of motion of an individual grain particle on the surface of a conical rotor performing simultaneous rotational and vibrational motion. The main forces acting on the particle during its movement are determined, including the centrifugal inertial force, the inertial force caused by vibrational motion, the gravitational force, the reaction force of the rotor surface, and the friction force between the particle and the working surface.
Based on the analysis of the conditions for continuous contact motion of a particle along the rotor surface, a differential equation describing its motion was obtained, and relationships for determining the displacement and velocity of grain particles depending on the vibration phase were derived. The conditions ensuring stable particle motion in the direction of expansion of the conical rotor with periodic stops were established. An analytical expression for determining the average velocity of grain material movement was obtained, taking into account the vibration amplitude and frequency, the angular velocity of rotor rotation, the cone angle of the working body, and the coefficient of friction between the material and the rotor surface.
The theoretical studies were supplemented by experimental investigations carried out on laboratory and pilot experimental installations, where the influence of rotor rotational speed, grain feed rate, and air flow parameters on the separation efficiency was analyzed. It was established that an increase in the vibration amplitude and frequency, as well as in the angular velocity of the rotor, leads to an increase in the average velocity of grain particle movement along the working surface. The obtained results can be used to substantiate the design and operating parameters of vibro-centrifugal separators and to develop high-performance grain cleaning machines.

1.    Rayner, M., & Dejmek, P. (2015). Engineering aspects of food emulsification and homogenization. CRC Press, Taylor & Francis Group. [in English].
2.    Barros, P. L., Ein-Mozaffari, F., & Lohi, A. (2022). Gas dispersion in non-Newtonian fluids with mechanically agitated systems: A review. Processes, 10(2), 275. https://doi.org/10.3390/pr10020275 [in English].
3.    Wang, S., Zhang, Y., Liu, X., & Li, J. (2022). Simulation analysis of power consumption and mixing performance of propeller mixers in pseudoplastic non-Newtonian fluids. Energies, 15(13), 4561. https://doi.org/10.3390/en15134561 [in English].
4.    Raut, A. S., & Chavan, V. M. (2021). Computational fluid dynamics used by mixing vessels for predicting hydrodynamic behaviour of mixture: An overview. Materials Today: Proceedings, 47, 5031–5038. https://doi.org/10.1016/j.matpr.2021.05.425 [in English].
5.    Lins Barros, P., Ein-Mozaffari, F., & Lohi, A. (2022). Empirical correlations and hydrodynamics in mixing of non-Newtonian fluids. Processes, 10(5), 913. https://doi.org/10.3390/pr10050913 [in English].
6.    Tamburini, A., Cipollina, A., Micale, G., & Brucato, A. (2022). Liquid mixing time and gas distribution in aerated multiple impeller stirred tanks. Chemical Engineering Research and Design, 184, 501–512. https://doi.org/10.1016/j.cherd.2022.06.020 [in English].
7.    Cullen, P. J. (Ed.). (2009). Food mixing: Principles and applications. Wiley-Blackwell. https://doi.org/10.1002/9781444318210 [in English].
8.    Paul, E. L., Atiemo-Obeng, V. A., & Kresta, S. M. (Eds.). (2004). Handbook of industrial mixing: Science and practice. Wiley. https://doi.org/10.1002/0471451452 [in English].
9.    Kresta, S. M., Etchells, A. W., Dickey, D. S., & Atiemo-Obeng, V. A. (2016). Advances in industrial mixing: A companion to the Handbook of industrial mixing. Wiley. https://doi.org/10.1002/9781118885239 [in English].
10.    Mykhalevych, A., Turchyn, I., & Kolesnyk, A. (2022). Functional and technological properties of protein ingredients in whey ice cream. Ukrainian Journal of Food Science, 10(1), 45–54. https://doi.org/10.24263/2310-1008-2022-10-1-6 [in English].