MODELING OF HEAT TRANSFER IN TUBES WITH TURBULENCE IN THE TRANSITION TO TURBULENT FLOW
Rubrics: CHEMISTRY AND CHEMICAL TECHNOLOGY
Authors:
Type:
Article
Pages:
from 60
to 65
Status:
Published
Received:
05.12.2019
Accepted:
11.12.2019
Published:
11.12.2019
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.
