Investigation of heat transfer and hydrodynamic drag in the turbulent flow of a gas in the field of a longitudinal pressure gradient of variable sign. I

1969 ◽  
Vol 16 (4) ◽  
pp. 387-395 ◽  
Author(s):  
A. A. Gukhman ◽  
V. A. Kirpikov ◽  
V. V. Gutarev ◽  
N. M. Tsirel'man
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Pressure Gradient ◽  
Hydrodynamic Drag ◽  
Variable Sign ◽  
Longitudinal Pressure Gradient

scholarly journals Heat transfer behind the backward-facing step under the influence of longitudinal pressure gradient

2016 ◽  
Vol 92 ◽  
pp. 01030 ◽  
Author(s):  
Tatyana Bogatko ◽  
Viktor Terekhov ◽  
Aleksey Dyachenko ◽  
Yaroslav Smulsky
Keyword(s):  
Heat Transfer ◽  
Pressure Gradient ◽  
Backward Facing Step ◽  
Longitudinal Pressure Gradient

scholarly journals HEAT TRANSFER IN GRADIENT TURBULENT BOUNDARY LAYER

2019 ◽  
Vol 41 (4) ◽  
pp. 19-26
Author(s):  
A.A. Avramenko ◽  
M.M. Kovetskaya ◽  
E.A. Kondratieva ◽  
T.V. Sorokina
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Heat Transfer Coefficient ◽  
Turbulent Boundary Layer ◽  
Pressure Gradient ◽  
Transfer Coefficient ◽  
Boundary Layer Separation ◽  
Variable Pressure ◽  
Flow Acceleration ◽  
Longitudinal Pressure Gradient

Effect of pressure gradient on heat transfer in turbulent boundary layer is constantly investigated during creation and improvement of heat exchange equipment for energy, aerospace, chemical and biological systems. The paper deals with problem of steady flow and heat  transfer in turbulent boundary layer with variable pressure in longitudinal direction. The mathematical model is presented and the analytical solution of heat transfer in the turbulent boundary layer problem at positive and negative pressure gradients is given. Dependences for temperature profiles and coefficient of heat transfer on flow parameters were obtained.  At negative longitudinal pressure gradient (flow acceleration) heat transfer coefficient can both increase and decrease. At beginning of acceleration zone, when laminarization effects are negligible, heat transfer coefficient increases. Then, as the flow laminarization increases, heat transfer coefficient decreases. This is caused by flow of turbulent energy transfers to accelerating flow. In case of positive longitudinal pressure gradient, temperature profile gradient near wall decreases. It is because of decreasing velocity gradient before zone of possible boundary layer separation.

DESIGN AND STUDY OF EXCHANGERS WITH PRESSURE GRADIENT HEAT INTENSIFIERS

2018 ◽  
Vol 8 (3) ◽  
pp. 137-144
Author(s):  
Nadezhda P. PETROVA ◽  
Anna A. TSYNAEVA
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Pressure Gradient ◽  
Heat Exchangers ◽  
Numerical Study ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Longitudinal Pressure Gradient ◽  
Heat Transfer Coeffi

This paper is presented the numerical study of local heat transfer in the turbulent boundary layer with longitudinal pressure gradient. The study is based to free software with open source code (Salome and Code_Saturne) has been based by RANS approach and empirical models of turbulence. Validation of mathematical models and software is based by collation numerical results with the results of experimental study of fl ow characteristics in a turbulent boundary layer of longitudinal pressure gradient and high turbulence intensity (Epik E. Ya., NASc of Ukraine). The validation had a high qualitative coincidence of the fl ow characteristics determined as a result of the simulation with experimental data. We designed two constructive schemes of heat exchangers for air. This study presents a calculation plan for these heat exchangers. Results of the study are showed that the use of gradient heat exchange intensifi ers leads to an increase in the heat transfer coeffi cient from air to 17 %.

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