Effect of Fin Thickness on Flow and Heat Transfer in Multi-louvered Fins

2002 ◽  
Author(s):  
Xiaogang Zhang ◽  
Danesh Tafti
Keyword(s):  
Heat Transfer ◽  
Flow And Heat Transfer ◽  
Fin Thickness ◽  
Louvered Fins

Effect of Fin Thickness on Flow and Heat Transfer in Multi-Louvered Fins

2002 ◽  
Author(s):  
X. Zhang ◽  
D. K. Tafti
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Thickness Ratio ◽  
The Other ◽  
Low Flow ◽  
Flow Acceleration ◽  
Flow And Heat Transfer ◽  
Pitch Ratio ◽  
Fin Thickness ◽  
Louvered Fins

High-resolution time-dependent numerical simulations are used to investigate the effect of thickness ratio on fluid flow and heat transfer performance in multi-louvered fins. Results for three fin thickness ratios, two louver angles, and a fin pitch to louver pitch ratio of one are reported for Reynolds number ranging from 50 to 1200. Thickness ratio is found to have a significant effect on flow efficiency, especially in geometries with small louver angles. For small louver angles, increasing thickness to louver pitch ratio from 0.05 to 0.15, decreases the flow efficiency by as much as 35–40%. As expected, increasing thickness ratio increases total pressure drop, most of which results from an increase in form drag. Heat transfer coefficient, on the other hand, is not influenced strongly by the thickness ratio. The increase in flow acceleration and local Reynolds number with increase in thickness ratio, on one hand, is offset by low flow efficiencies and recirculation zones on the other. As a consequence, some heat transfer degradation is found at low Reynolds numbers, however the degradation diminishes as the Reynolds number increases beyond 300. In general, larger thickness ratios lead to a lower ratio of j/f.

scholarly journals The Effect of Geometrical Parameters on Heat Transfer Characteristics of Compact Heat Exchanger with Louvered Fins

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
P. Gunnasegaran ◽  
N. H. Shuaib ◽  
M. F. Abdul Jalal
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Three Dimensional ◽  
Cross Flow ◽  
Geometrical Parameters ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Flow And Heat Transfer ◽  
Drop Flow ◽  
Louvered Fins

Compact heat exchangers (CHEs) have been widely used in various applications in thermal fluid systems including automotive thermal management systems. Among the different types of heat exchangers for engine cooling applications, cross-flow CHEs with louvered fins are of special interest because of their higher heat rejection capability with the lower flow resistance. In this study, the effects of geometrical parameters such as louver angle and fin pitch on air flow and heat transfer characteristics on CHEs are numerically investigated. Numerical investigations using five different cases with increased and decreased louver angles (+2°, +4°, −2°, −4°, and uniform angle 20°), with a fixed fin pitch and using three different fin pitches (1.0 mm, 2.0 mm, and 4.0 mm), and with the fixed louver angle are examined. The three-dimensional (3D) governing equations for the fluid flow and heat transfer are solved using a standard finite-volume method (FVM) for the range of Reynolds number between 100 and 1000. The computational model is used to study the variations of pressure drop, flow temperature, and Nusselt number.

Flow and Heat Transfer Correlations for Porous Fin in a Plate-Fin Heat Exchanger

2000 ◽  
Vol 122 (3) ◽  
pp. 572-578 ◽  
Author(s):  
S. Y. Kim ◽  
J. W. Paek ◽  
B. H. Kang
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Test Environment ◽  
Porous Fin ◽  
Flow And Heat Transfer ◽  
Louvered Fin ◽  
Porous Fins ◽  
The Impact ◽  
Louvered Fins

The present experimental study investigates the impact of porous fins on the pressure drop and heat transfer characteristics in plate-fin heat exchangers. Systematic experiments have been carried out in a simplified model of a plate-porous fin heat exchanger at a controlled test environment. The porous fins are made of 6101 aluminum-alloy foam materials with different permeabilities and porosities. Comparison of performance between the porous fins and the conventional louvered fins has been made. The experimental results indicate that friction and heat transfer rate are significantly affected by permeability as well as porosity of the porous fin. The porous fins used in the present study show similar thermal performance to the conventional louvered fin. However, the louvered fin shows a little better performance in terms of pressure drop. For compactness of the heat exchanger, the porous fins with high pore density and low porosity are preferable. Useful correlations for the friction factor and the modified j-factor are also given for the design of a plate-porous fin heat exchanger. [S0022-1481(00)01103-8]

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