Engineering, Energy, Transport AIC

Oleh TSURKAN – Doctor of Technical Sciences, Professor, director of Separated structural unit «Ladyzhyn Professional College of Vinnytsia National Agrarian University» (5, P. Kravchyka St., Ladyzhyn, Vinnytsia region, 24321m Ukraine, 24321, e-mail: tsurkan_ov76@ukr.net, https://orcid.org/0000-0002- 7218-0026).
Anatoly SPIRIN – Candidate of Technical Sciences, Associate Professor, Teacher of Separate structural subdivision «Ladyzhyn vocational college of Vinnytsia National Agrarian University» (Kravchik Petro St., 5, Ladyzhyn, Vinnytsia Region, Ukraine, 24321, e-mail: spirinanatoly16@gmail.com, https://orcid.org/0000- 0002-4642-6205).
Andrii DIDYK – postgraduate student of the Department of Engineering Mechanics and Technological Processes in the Agro-Industrial Complex of the Faculty of Engineering and Technology of Vinnytsia National Agrarian University (3 Sunny Street, Vinnytsia, 21008, Ukraine, +380972830537, anddidyk99@gmail.com, https://orcid.org/0000-0002-0524-0017)
Volodymyr RUTKEVYCH – Candidate of Technical Sciences, Senior Lecturer of Department of machines and equipment of agricultural production of Vinnytsia National Agrarian University (St. Soniachna, 1, Vinnytsia, Ukraine, 21008, e-mail: luts@vsau.vin.ua). ORCID 0000-0002-6366-7772).

The results of the study on determining the rational operating parameters of drying walnuts of the Chandler variety in a convective-vibratory dryer are considered. The feasibility of using vibration effects to increase the intensity of heat and mass transfer and reduce specific energy consumption is substantiated. The material of the study was fully ripe nuts, which were dried to standard humidity. An analytical regression equation was established that describes the dependence of specific energy consumption on the temperature of the drying agent, air flow velocity and vibration acceleration of the drying chamber. The response surfaces were analyzed and the relationships between the main process factors were determined.
According to the results of mathematical modeling, rational parameters were established: temperature 38 °C, speed 22.5 m/s, vibration acceleration 65.6 m/s² at an amplitude of oscillations of 6.5 mm. Verification of the model showed that the discrepancy between theoretical and experimental data does not exceed 11%, which confirms its adequacy.
It is noted that the use of vibration effects contributes to the formation of a fluidized bed, reducing aerodynamic resistance and increasing the heat transfer coefficient. The results obtained can be used to optimize the operating parameters of laboratory and industrial dryers, develop energy-saving technologies and ensure stable quality of finished products. Prospects for further research related to modeling of drying agent turbulization and scaling processes in industrial conditions are outlined. 
The proposed approach creates prerequisites for scaling the convective–vibratory drying technology to industrial conditions while maintaining product quality and significantly reducing overall energy consumption.

1.    Chen, C., Venkitasamy, C., Zhang, W., Deng, L., Meng, X., & Pan, Z. (2020). Effect of step-down temperature drying on energy consumption and product quality of walnuts. Journal of Food Engineering, 285, 110105. DOI: https://doi.org/10.1016/j.jfoodeng.2020.110105 [in English].
2.    Kaletnik, H., Tsurkan, O., Spirin, A., Gudzenko, N., Prysiazhniuk, D., & Didyk, A. (2024). Substantiation of the operating parameters of walnut drying equipment. Journal of Engineering Sciences, 11(2), F27–F34. DOI: https://doi.org/10.21272/jes.2024.11(2).f4 [in Ukrainian].
3.    Meleichuk, V. M. (2018). Teplomasoobmin u tekhnolohichnykh protsesakh kharchovoi promyslovosti. Sumy State University Press. [in Ukrainian].
4.    Kotov, B. I., & Lisetskyi, V. O. (2001). Analysis of the influence of drying regimes on the energy characteristics of grain dryers. Visnyk KhDTUSG, 1(8), 166–170. [in Ukrainian].
5.    Kotov, B. I. (2001). Analysis of trends in increasing fuel and energy efficiency of grain dryers. Collection of Scientific Works of Kirovohrad State Technical University, 10, 227–232. [in Ukrainian].
6.    Tsurkan, O. V., Spirin, A. V., Didyk, A. M., & Bondarenko, M. P. (2024). Ways to intensify the walnut drying process. Vibratsii v Tekhnitsi ta Tekhnolohii, 4(115), 52–59. DOI: https://doi.org/10.37128/2306-8744-2024-4-7 [in Ukrainian].
7.    Tsurkan, O. V., Rutkevych, V. S., & Didyk, A. M. (2023). Theoretical studies of walnut drying using vibration technologies. Visnyk Khmelnytskoho Natsionalnoho Universytetu. Seriia: Tekhnichni Nauky, 4(323), 337–342. DOI: https://doi.org/10.31891/2307-5732-2023-323-4-337-342 [in Ukrainian].
8.    State Enterprise “Ukrainian Research and Training Center for Standardization, Certification and Quality”. (2019). DSTU 8900:2019. Walnuts. Technical conditions. Kyiv. [in Ukrainian].
9.    Kaletnik, H. M., Tsurkan, O. V., Honcharuk, I. V., Gudzenko, N. M., Spirin, A. V., Prysiazhniuk, D. V., Didyk, A. M., & Rutkevych, V. S. (2025). Convective dryer for walnuts (Patent No. 154529, Ukraine). URL: https://sis.nipo.gov.ua [in Ukrainian].
10.    Tsurkan, O. V., Spirin, A. V., Rutkevych, V. S., & Didyk, A. M. (2024). Development of a convective–vibratory dryer for walnut drying. Visnyk Khmelnytskoho Natsionalnoho Universytetu. Seriia: Tekhnichni Nauky, 2(331), 393–399. DOI: https://doi.org/10.31891/2307-5732-2024-333-2-61 [in Ukrainian].
11.    Tsurkan, O. V., Spirin, A. V., Gudzenko, N. M., & Didyk, A. M. (2024). Mathematical model of the walnut drying process in a convective–vibratory dryer. Vibratsii v Tekhnitsi ta Tekhnolohii, 4(115), 5–14. DOI: https://doi.org/10.37128/2306-8744-2024-4-1 [in Ukrainian].
12.    Tsurkan, O. V., Spirin, A. V., Rutkevych, V. S., & Didyk, A. M. (2024). Evaluation of the efficiency of walnut drying in a convective–vibratory dryer. Vibratsii v Tekhnitsi ta Tekhnolohii, 3(114), 5–12. DOI: https://doi.org/10.37128/2306-8744-2024-3-1 [in Ukrainian].
13.    Chen, C., Venkitasamy, C., Zhang, W., Khir, R., Upadhyaya, S., & Pan, Z. (2020). Effective moisture diffusivity and drying simulation of walnuts under hot air. International Journal of Heat and Mass Transfer, 150, 119283. DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2019.119283 [in English].
14.    Silva, P. C., Resende, O., Ferreira Junior, W. N., Silva, L. C. M., Quequeto, W. D., & Silva, F. A. S. (2022). Drying kinetics of Brazil nuts. Food Science and Technology, 42, e64620. DOI: https://doi.org/10.1590/fst.64620 [in English].
15.    Lanets, O. S. (2018). Osnovy rozrakhunku ta konstruuvannia vibratsiinykh mashyn (Vol. 1: Theory and practice of creating vibration machines with harmonic motion of the working body). Lviv Polytechnic National University Press. [in Ukrainian].