Determination of heat transfer coefficients for cylindrical products exposed to forced-air cooling

1995 ◽  
Vol 19 (5) ◽  
pp. 451-459 ◽  
Author(s):  
Ibrahim Dincer
Keyword(s):  
Heat Transfer ◽  
Air Cooling ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Forced Air

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.

Determination of heat transfer coefficients for complex spray cooling arrangements

2016 ◽  
Vol 11 (3/4) ◽  
pp. 229 ◽  
Author(s):  
Sebastian Herbst ◽  
Kim Florian Steinke ◽  
Hans Jürgen Maier ◽  
Andrzej Milenin ◽  
Florian Nürnberger
Keyword(s):  
Heat Transfer ◽  
Spray Cooling ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients

Measurement and interpretation of the heat transfer coefficients of metal foams

2005 ◽  
Vol 219 (2) ◽  
pp. 183-191 ◽  
Author(s):  
A J Fuller ◽  
T Kim ◽  
H P Hodson ◽  
T J Lu
Keyword(s):  
Heat Transfer ◽  
Effective Porosity ◽  
Transfer Coefficients ◽  
Constant Input ◽  
Heat Transfer Coefficients ◽  
Copper Foam ◽  
Flow Mixing ◽  
Extended Surface ◽  
Conductive Substrates ◽  
Forced Air

The heat transfer characteristics of FeCrAlY (an iron-based alloy with a melting point of 1510°C sintered foams are presented. The foams have open cells and hollow cell ligaments. The foam samples had a range of cell sizes (1-3 mm) and relative densities (4.6-12.5 percent). Foam cores sandwiched between two conductive substrates were subjected to forced air convection with a constant input heat flux. The volumetric heat transfer coefficient is shown to depend on the effective porosity. Heat transfer is predominantly due to the increased flow mixing that the foam structure promotes. With higher-conductivity materials, the foam also acts to increase the heat transfer by providing an extended surface area, but this is not a strong effect in FeCrAlY foams owing to the low thermal conductivity of 16 W/m K. The FeCrAlY foam is compared with copper foam, and the latter effect is more significant.

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