EXPERIMENTAL STUDY OF HEAT TRANSFER PROCESS lN TURBULENT BOUNDARY LAYER ON A PLATE IN FLOWS OF VARIOUS FLUIDS

1970 ◽  
Author(s):  
Algirdas Zukauskas ◽  
Anupras Slanciauskas
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Experimental Study ◽  
Turbulent Boundary Layer ◽  
Transfer Process ◽  
Heat Transfer Process

Heat Transfer Aspects of Nonisothermal Axisymmetric Upset Forging

1984 ◽  
Vol 106 (3) ◽  
pp. 187-195 ◽  
Author(s):  
P. Dadras ◽  
W. R. Wells
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Finite Difference ◽  
Transfer Process ◽  
Heat Transfer Process ◽  
Physical Characteristics ◽  
Transient Heat Transfer ◽  
Interfacial Film ◽  
Upset Forging ◽  
Finite Difference Solution

A finite difference solution for the transient heat transfer during axisymmetric upset forging has been developed. The interfacial film between the die and the billet has been included in the analysis, and all modes of heat transfer have been taken into account. The results of a parallel experimental study have also been presented. The effects of geometrical and physical characteristics of the billet and the die on the heat transfer process, particularly on die heating, have been systematically investigated.

scholarly journals Experimental study of the turbulent boundary layer in the presence of a rectangular perforated rib

2019 ◽  
Author(s):  
V.N. Afanasiev ◽  
Dehai Kong ◽  
S.I. Getya ◽  
V.L. Trifonov
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Experimental Study ◽  
Turbulent Boundary Layer ◽  
Gas Turbines ◽  
Jet Flows ◽  
Space Technology ◽  
Heat Transfer Efficiency ◽  
Mass Transfer Processes ◽  
Efficient Heat Transfer

Separated flows are widespread in many areas of science and technology, such as space technology, aviation, gas turbines, etc., which has a significant effect on the processes of hydrodynamics and heat transfer in them. The separation of the flow and its reattachment can serve as a powerful means of enhancing heat and mass transfer processes, and its organization is quite simple and reliable in terms of technology. This paper presents the results of the experimental study on hydrodynamics and heat transfer in the separation zone in front and behind a single rectangular perforated rib located on a flat plate heated by the law of qw = const. Experimental measurements were carried out using the Pitot-Prandtl tube and Dantec Dynamics hot-wire anemometry system, which allows us to obtain new characteristics of the turbulent boundary layer, both mean and oscillatory ones. We analyzed the influence of the perforation ratio of the rib and the location of the holes in the rib on the heat transfer efficiency. It was established that the stagnant and recirculation zones in front and behind the perforated rib were shifted and became smaller or disappeared. Findings of research show that jet flows, impinging on the heat transfer surface from the perforation holes, provide more efficient heat transfer behind the perforated rib, compared to that behind the solid rib.

Perforated Rib in Turbulent Boundary Layer

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Valery N. Afanasiev ◽  
Dehai Kong ◽  
S. A. Isaev
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Experimental Study ◽  
Turbulent Boundary Layer ◽  
Separation Zone ◽  
Area Ratio ◽  
Open Area ◽  
Staggered Arrangement ◽  
Recirculation Zones ◽  
The Mean

Abstract This study presents the results of the experimental study on hydrodynamics and heat transfer in separation zone in front and behind a single rectangular perforated rib mounted on a flat plate. The effects of perforation open-area ratio (β = 12%, 23.5%, and 44%) and the location of the hole on the rib (at the bottom, at the top, and in a staggered arrangement) on the mean and fluctuating characteristics of the turbulent dynamic and thermal boundary layers in the median section of the plate were examined. It was established that the stagnant and recirculation zones in the front and behind the perforated rib were shifted and became smaller or disappeared.

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