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

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

A Study of Condensation Heat Transfer in a Single Mini-Tube and a Review of Korean Micro- and Mini-Channel Studies

2003 ◽  
Author(s):  
M. H. Kim ◽  
J. S. Shin ◽  
C. Huh ◽  
T. J. Kim ◽  
K. W. Seo
Keyword(s):  
Heat Transfer ◽  
Flow Boiling ◽  
Flow Characteristics ◽  
Saturation Temperature ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Condensation Heat Transfer ◽  
Transfer Coefficients ◽  
Round Tube ◽  
Two Phase

This paper reviews recent Korean studies of flow characteristics, flow boiling, and flow condensation in micro- and mini-channels. The characteristics of local heat transfer and pressure drops were experimentally investigated using condensing R134a two-phase flow, in a single round tube, with an inner diameter of 0.691 mm. New experimental techniques were developed to measure the condensation heat transfer coefficient. Tests were performed for a mass flux of 100 to 600 kg/m2s, a heat flux of 5 to 20 kW/m2, and a saturation temperature of 40°C. The experimental local condensation heat transfer coefficients and two-phase frictional pressure gradients are shown. Comparisons of experimental data with existing models reveal that the correlations failed to predict the present data. This study contains the unique sub-millimeter-diameter, single round tube, condensation data reported in the literature.

Size effects in local heat exchange under boiling of liquid nitrogen in an electric field

2010 ◽  
Vol 48 (5) ◽  
pp. 761-764
Author(s):  
A. A. Eronin ◽  
S. P. Malyshenko ◽  
A. I. Zhuravlev
Keyword(s):  
Heat Exchange ◽  
Electric Field ◽  
Liquid Nitrogen ◽  
Size Effects ◽  
Local Heat
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