COMPARATIVE CHARACTERISTICS OF METHODS FOR INTENSIFYING HEAT TRANSFER IN TUBULAR AND LAMELLAR APPARATUSES
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
KGEU
2.
Kazan National Research Technological University
3.
Kazan State Energy University
Type:
Article
Pages:
from 107
to 112
Status:
Published
Received:
17.02.2026
Accepted:
08.04.2026
Published:
05.05.2026
Language:
Russian
Keywords:
HEAT TRANSFER, HEAT TRANSFER COEFFICIENTS, PLATE AND TUBE DEVICES, INTENSIFICATION METHODS, NUSSELT NUMBER
Funding:
Issledovanie vypolneno za schet granta Rossiyskogo nauchnogo fonda № 25-29-00129, https://rscf.ru/project/25-29-00129
Abstract:
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.
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.
Keywords:
HEAT TRANSFER, HEAT TRANSFER COEFFICIENTS, PLATE AND TUBE DEVICES, INTENSIFICATION METHODS, NUSSELT NUMBER
HEAT TRANSFER, HEAT TRANSFER COEFFICIENTS, PLATE AND TUBE DEVICES, INTENSIFICATION METHODS, NUSSELT NUMBER
