scholarly journals APPROXIMATE ESTIMATES OF COMPLEX HEAT EXCHANGE IN OPTICALLY THICKNESS AND OPTICALLY THIN TURBULENT BOUNDARY LAYER

2019 ◽  
Vol 41 (3) ◽  
pp. 20-25
Author(s):  
A.A. Avramenko ◽  
N.P. Dmitrenko ◽  
V.M. Kovalenko ◽  
V.G. Gorobets
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Heat Exchange ◽  
Turbulent Boundary Layer ◽  
Turbulent Layer ◽  
Complex Heat Transfer ◽  
Complex Heat Exchange

The article analyzes the main aspects of the process of complex heat transfer in an optically thin and optically thick boundary turbulent layer.

scholarly journals 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

2018 ◽  
Vol 1 (12) ◽  
pp. 76-81
Author(s):  
Igor' Lobanov
Keyword(s):  
Mathematical Modeling ◽  
Heat Transfer ◽  
Boundary Layer ◽  
Heat Exchange ◽  
Turbulent Boundary Layer ◽  
Prandtl Number ◽  
Layer Model ◽  
Fourth Degree ◽  
Proportionality Coefficient ◽  
Prandtl Numbers

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

Improvement of skin friction and heat transfer prediction theory of turbulent boundary-layer combustion of hydrogen

2017 ◽  
Vol 42 (41) ◽  
pp. 26123-26131 ◽  
Author(s):  
Hongpeng Liu ◽  
Zhenxun Gao ◽  
Yihao Tang ◽  
Chongwen Jiang ◽  
Chun-Hian Lee
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Skin Friction ◽  
Prediction Theory ◽  
Combustion Of Hydrogen
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