INTENSIFIED HEAT EXCHANGE AT THE TURBULENT CURRENT IN PIPES WITH TURBULIZERS WITH THE APPLICATION OF THE FOUR-LAYER MODEL OF THE TURBULENT BORDER LAYER DEPENDING ON THE NUMBER PRANDTLE
Rubrics: CHEMISTRY AND CHEMICAL TECHNOLOGY
Authors:
1.
Moscow Aircraft Institute (State Technical University)
( Leading researcher PNIL-204)
employee
Moscow, Moscow, Russian Federation
employee
Moscow, Moscow, Russian Federation
Type:
Article
Pages:
from 76
to 81
Status:
Published
Received:
05.12.2018
Accepted:
09.01.2023
Published:
18.12.2018
Language:
Russian
Keywords:
modeling; mathematical; heat exchange; intensification; turbulent; trumpet; flow; turbulizer; four-layered; boundary layer; the Prandtl test.
Abstract (English):
The main aspects of mathematical modeling of intensified heat transfer in turbulent flow in pipes with turbulators with the use of a four-layer model of a turbulent boundary layer are analyzed in the article, depending on the Prandtl number. The advantage of the law of the "fourth" degree is shown for large Prandtl numbers for the calculation of heat transfer in tubes with turbulators; It is shown that for tubes with turbulators the proportionality coefficient in this law is much higher than in smooth tubes, which indicates an increased level of turbulence in them at the boundary of the viscous and buffer sublayers. The results of calculating heat transfer for large Prandtl numbers have shown that the relative heat exchange with increasing Prandtl number increases rather insignificantly, especially after Pr>102; after Pr>103 it almost stabilizes
The main aspects of mathematical modeling of intensified heat transfer in turbulent flow in pipes with turbulators with the use of a four-layer model of a turbulent boundary layer are analyzed in the article, depending on the Prandtl number. The advantage of the law of the "fourth" degree is shown for large Prandtl numbers for the calculation of heat transfer in tubes with turbulators; It is shown that for tubes with turbulators the proportionality coefficient in this law is much higher than in smooth tubes, which indicates an increased level of turbulence in them at the boundary of the viscous and buffer sublayers. The results of calculating heat transfer for large Prandtl numbers have shown that the relative heat exchange with increasing Prandtl number increases rather insignificantly, especially after Pr>102; after Pr>103 it almost stabilizes
Keywords:
modeling; mathematical; heat exchange; intensification; turbulent; trumpet; flow; turbulizer; four-layered; boundary layer; the Prandtl test.
modeling; mathematical; heat exchange; intensification; turbulent; trumpet; flow; turbulizer; four-layered; boundary layer; the Prandtl test.
