Abstract
It is known that the initial level of gas flow turbulence has a noticeable effect on the development and structure of the boundary layer and on the intensity of heat transfer, respectively. Many scientists have evaluated the influence of the flow turbulence number on the level of heat transfer for various applications, among them Dyban E.P., Kestin J., Simonich JC, Isomoto K., Dreitser G.A., Terekhov V.I., MacMullin R. and etc. In all cases, the turbulence of the flow led to the intensification of heat transfer. However, insufficient attention is paid to studies of the effect of turbulence on the heat transfer of flows in pipes. The studies were carried out on the basis of numerical modeling of gas dynamics and heat transfer of stationary flows based on the CFD method. The results of numerical modeling to assess the influence of the turbulence scale of gas flows on heat transfer in a long smooth pipe are presented in the article. It has been established that a growth in the heat transfer coefficient by about 3% occurs with an increase in the turbulence scale from 10 to 30% with a Reynolds number equal to 250,000.
Highlights
The movement of gas streams and the corresponding heat exchange in flow parts and gas-air systems take place in many technical and power devices
It has been established that a growth in the heat transfer coefficient by about 3% occurs with an increase in the turbulence scale from 10 to 30% with a Reynolds number equal to 250,000
The turbulence scale is usually used in the case of numerical modeling of gas dynamics and heat transfer, which is physically similar to the turbulence number
Summary
The movement of gas streams and the corresponding heat exchange in flow parts and gas-air systems take place in many technical and power devices. The turbulence scale is usually used in the case of numerical modeling of gas dynamics and heat transfer, which is physically similar to the turbulence number. [8] conducted experimental studies to obtain the local distribution of the heat transfer coefficient on a typical blade of a gas turbine engine in an aerothermodynamic cascade device They did not find any difference in either local or integral heat transfer within the free flow turbulence range for the conditions of this experiment (turbulence rate 6-8%). The main tasks of the study consisted in choosing the most suitable turbulence model and assessing the influence of the turbulence scale value on the heat transfer rate during gas flow in a pipe. The calculation of the heat transfer coefficient was carried out on the basis of the data in the book [3]
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