Effect of velocity of a condensing vapor stream on distribution of local heat exchange characteristics along the height of a vertical tube

1974 ◽  
Vol 26 (6) ◽  
pp. 749-753
Author(s):  
V. T. Buglaev ◽  
I. N. Afanas'eva
Keyword(s):  
Heat Exchange ◽  
Local Heat ◽  
Vertical Tube ◽  
Vapor Stream

The Effect of Regulating Elements on Convective Heat Transfer along Shaped Heat Exchange Surfaces

2013 ◽  
Vol 34 (1) ◽  
pp. 5-16 ◽  
Author(s):  
Jozef Cernecky ◽  
Jan Koniar ◽  
Zuzana Brodnianska
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Cfd Simulation ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Temperature Fields ◽  
Transfer Coefficients ◽  
Heat Transfer Intensification ◽  
Heat Transfer Coefficients ◽  
Forced Air

Abstract The paper deals with a study of the effect of regulating elements on local values of heat transfer coefficients along shaped heat exchange surfaces with forced air convection. The use of combined methods of heat transfer intensification, i.e. a combination of regulating elements with appropriately shaped heat exchange areas seems to be highly effective. The study focused on the analysis of local values of heat transfer coefficients in indicated cuts, in distances expressed as a ratio x/s for 0; 0.33; 0.66 and 1. As can be seen from our findings, in given conditions the regulating elements can increase the values of local heat transfer coefficients along shaped heat exchange surfaces. An optical method of holographic interferometry was used for the experimental research into temperature fields in the vicinity of heat exchange surfaces. The obtained values correspond very well with those of local heat transfer coefficients αx, recorded in a CFD simulation.

scholarly journals Condensation inside smooth horizontal tubes: Part 1. Survey of the methods of heat-exchange prediction

2015 ◽  
Vol 19 (5) ◽  
pp. 1769-1789 ◽  
Author(s):  
Volodymyr Rifert ◽  
Volodymyr Sereda
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Film Condensation ◽  
Experimental Investigations ◽  
Phase Flow ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Horizontal Tubes

Survey of the works on condensation inside smooth horizontal tubes published from 1955 to 2013 has been performed. Theoretical and experimental investigations, as well as more than 25 methods and correlations for heat transfer prediction are considered. It is shown that accuracy of this prediction depends on the accuracy of volumetric vapor content and pressure drop at the interphase. The necessity of new studies concerning both local heat transfer coefficients and film condensation along tube perimeter and length under annular, stratified and intermediate regimes of phase flow was substantiated. These characteristics being defined will allow determining more precisely the boundaries of the flow regimes and the methods of heat transfer prediction.

Local Heat Exchange in the Combustion Chamber of a Hydrogen Engine Running on a Lean Fuel Mixture

2021 ◽  
Vol 50 (1) ◽  
pp. 79-87
Author(s):  
R. Z. Kavtaradze ◽  
A. M. Kondratev ◽  
Ch. Rongrong ◽  
Ch. Citian ◽  
S. Baigang ◽  
...  
Keyword(s):  
Heat Exchange ◽  
Combustion Chamber ◽  
Fuel Mixture ◽  
Local Heat ◽  
Lean Fuel

An experimental investigation of local heat-exchange coefficients on the walls of a valve mechanism

1982 ◽  
Vol 23 (2) ◽  
pp. 205-210 ◽  
Author(s):  
V. N. Zaikovskii ◽  
E. G. Zaulichnyi ◽  
B. M. Melamed ◽  
Yu. M. Senov
Keyword(s):  
Experimental Investigation ◽  
Heat Exchange ◽  
Local Heat ◽  
Valve Mechanism

Local heat exchange of a single transversely bathed round tube with external circular fins

1976 ◽  
Vol 30 (2) ◽  
pp. 178-182 ◽  
Author(s):  
V. M. Legkii ◽  
Ya. S. Zholudov ◽  
O. A. Gerashchenko
Keyword(s):  
Heat Exchange ◽  
Local Heat ◽  
Round Tube
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