Experimental data on heat transfer in tubular and plate heat exchangers with surface and volume intensifiers are presented. It is noted that the most urgent task is to intensify heat transfer in the channels of the devices during the movement of liquid media with increased viscosity (synthetic and mineral oils, fuel oil, etc.). Due to the use of intensifiers, the transition from laminar to turbulent mode is ensured at low Reynolds numbers (less than 500-600), which gives a sharp increase in heat transfer coefficients (by 5-15 times). For tubular and plate heat exchangers, the results of experimental studies are given when using irregular (chaotic) metal nozzles with a single element size of 6 mm as volumetric intensifiers. Graphical dependences for the Nusselt number and the coefficient of hydraulic resistance are shown, as well as a comparison with various methods of intensification (annular projections and wire inserts). An increase in heat transfer coefficients during heating of transformer, industrial and hydraulic oils by 6-15 times compared with smooth channels, depending on the Reynolds number, has been established. Theoretical expressions for the Nusselt number in channels with intensifiers and comparison with experimental data are considered.
HEAT TRANSFER, HEAT TRANSFER COEFFICIENTS, PLATE AND TUBE DEVICES, INTENSIFICATION METHODS, NUSSELT NUMBER
1. A.I. Leontyev, V.V. Olympiev. News of the Academy of Sciences "Energetika" 1. 7–31. (2011).
2. A.I. Leontyev, V.V. Olympiev. TVT. 45. 6. 925–953. (2007). DOI: https://doi.org/10.1016/S0033-8389(07)00152-2; EDN: https://elibrary.ru/IBJXWB
3. I. A. Popov, Yu. F. Gortyshov, V. V. Olympiev, Heat Engineering, 1, 3 (2012). EDN: https://elibrary.ru/OOWMPH
4. A.I. Leont’ev, Yu.A.Kuzma-Kichta, S.V. Veretennikov, O.A. Evdokimov. High Temperature. 60. 2. 267–280. (2022). DOI: https://doi.org/10.1134/S0018151X21050126
5. I.A. Popov, Kh. M. Makhyanov, V. M. Center for Innovative Technologies, Kazan: 560. (2009).
6. A. G. Laptev, M. M. Basharov, E. A. Lapteva. 2nd edition, revised. Stary Oskol: Thin science-intensive technologies. 288. (2025).
7. Yu.V. Vidin, V.V. Ivanov, R.V. Kazakov. Siberian Federal University. Moscow, Krasnoyarsk, INFRA-M, Siberian Federal University. 166. (2018)
8. S. L. Demenok. St. Petersburg: N-Prom Buro.285 p. (2012).
9. Yu. F. Gortyshov, V.V. Olimpiev, B.E. Baigaliev. Kazan: Kazan Publishing House. state technical University. 432. (2004).
10. A.V. Troshin, A.M. Naumov. Voronezh: AGBOU "Voronezh Gos. tech. un-t." 132. (2016)
11. Yu.G. Nazmeev. M.: Energoatomizdat. 376. (1998).
12. A.L. Efimov, O.K. Berezhnaya, M.Yu. Yurkina .//Bulletin MPEI. 5. 72–82. (2016).
13. V. G. Lushchik, A. I. Reshmin. TVT. 62:3. 374-382. (2024). DOI: https://doi.org/10.31857/S0040364424030072; EDN: https://elibrary.ru/NRUWYU
14. D. Kong, Sh. Ren, S. Isaev, C. Liu, S. Liu, X. Niu. International Journal of Thermal Sciences. 209. 109531. (2025).
15. S.A. Isaev, D.V. Nikushchenko, N.I. Mikheev, N.S. Dushin, O.O. Milman, A.A. Klyus, E.A. Osiyuk. High temperatures. 62. 4. 460–470. (2024). DOI: https://doi.org/10.1134/S0018151X25700099
16. S. A. Isaev, S. Z. Sapozhnikov, D. V. Nikushchenko [et al.] Fluid Dynamics. 59. 1. 49-59. (2024). DOI: https://doi.org/10.1134/S0015462823602310; EDN: https://elibrary.ru/DWNNWO
17. I.A. Popov, V.M. Gureev, M.V. Gureev, Yu.V. Zhukova, A.D. Chorny, T.A. Baranova, I.G. Kukharchuk, I.A. Popov. Journal of Engineering Physics and Thermophysics. 97. 7. 1840–1853. (2024). DOI: https://doi.org/10.1007/s10891-024-03066-y; EDN: https://elibrary.ru/PJMKRS
18. A. G. Sayfetdinov, Yu. A. Firsova, D. D. Dyuzhin. Bulletin of the University of Technology. 28, 7. 113-116. (2025). DOI: https://doi.org/10.55421/3034-4689_2025_28_7_113; EDN: https://elibrary.ru/OBENUI
19. O.S. Dmitrieva, A.V. Dmitriev, M.G. Garipov, Herald ofTechnological University. 28, 1. 117-121. (2025). DOI: https://doi.org/10.55421/1998-7072_2025_28_1_117; EDN: https://elibrary.ru/XCVYHK
20. A. G. Laptev, T. M. Farakhov, E. A. Lapteva. Journal of Engineering Thermophysics. 30. 2. 293-299. (2021). DOI: https://doi.org/10.1134/S1810232821020107; EDN: https://elibrary.ru/MFMOFX
21. A.G. Laptev, T.M. Farakhov, E.P. Afanas'ev. Theoretical Foundations of Chemical Engineering. 52. 5. 853-858. (2018). DOI: https://doi.org/10.1134/S0040579518050378; EDN: https://elibrary.ru/VXUXKM
22. A. G. Laptev, A. A. Akhmitshin. Thermophysics and aeromechanics. 32, 3. 529-542. (2025). DOI: https://doi.org/10.63430/TIA202503010; EDN: https://elibrary.ru/KNLVKQ
